1
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Gjerde N, Del Giudice A, Zhu K, Knudsen KD, Galantini L, Schillén K, Nyström B. Synthesis and Characterization of a Thermoresponsive Copolymer with an LCST-UCST-like Behavior and Exhibiting Crystallization. ACS OMEGA 2023; 8:31145-31154. [PMID: 37663484 PMCID: PMC10468772 DOI: 10.1021/acsomega.3c03162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 08/03/2023] [Indexed: 09/05/2023]
Abstract
In this work, the diblock copolymer methoxy-poly(ethylene glycol)-block-poly(ε-caprolactone) (MPEG-b-PCL) was synthesized with a block composition that allows this polymer in aqueous media to possess both an upper critical solution temperature (UCST) and a lower critical solution temperature (LCST) over a limited temperature interval. The value of the UCST, associated with crystallization of the PCL-block, depended on heating (H) or cooling (C) of the sample and was found to be CPUCSTH = 32 °C and CPUCSTC = 23 °C, respectively. The LCST was not affected by the heating or cooling scans; assumed a value of 52 °C (CPLCSTH = CPLCSTC). At intermediate temperatures (e.g., 45 °C), dynamic light scattering (DLS), small-angle X-ray scattering (SAXS), and cryogenic transmission electron microscopy (cryo-TEM) showed that the solution consisted of a large population of spherical core-shell particles and some self-assembled rodlike objects. At low temperatures (below 32 °C), differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS) in combination with SAXS disclosed the formation of crystals with a cylindrical core-shell structure. Cryo-TEM supported a thread-like appearance of the self-assembled polymer chains. At temperatures above 52 °C, incipient phase separation took place and large aggregation complexes of amorphous morphology were formed. This work provides insight into the intricate interplay between UCST and LCST and the type of structures formed at these conditions in aqueous solutions of MPEG-b-PCL diblock copolymers.
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Affiliation(s)
- Natalie
Solfrid Gjerde
- Department
of Chemistry, “Sapienza” University
of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Alessandra Del Giudice
- Department
of Chemistry, “Sapienza” University
of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Kaizheng Zhu
- Faculty
of Engineering, Østfold University
College, P.O. Box 700, 1757 Halden, Norway
| | | | - Luciano Galantini
- Department
of Chemistry, “Sapienza” University
of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Karin Schillén
- Division
of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Bo Nyström
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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2
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Tan J, Gjerde N, Del Giudice A, Knudsen KD, Galantini L, Du G, Schillén K, Sande SA, Nyström B. Interactions in Aqueous Mixtures of Cationic Hydroxyethyl Cellulose and Different Anionic Bile Salts. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:3732-3741. [PMID: 36791398 PMCID: PMC9983013 DOI: 10.1021/acs.jafc.3c00076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 02/04/2023] [Indexed: 06/18/2023]
Abstract
It is known that the reduction of blood cholesterol can be accomplished through foods containing a large number of dietary fibers; this process is partially related to the binding of bile salt to fibers. To gain new insights into the interactions between dietary fibers and bile salts, this study investigates the interactions between cationic hydroxyethyl cellulose (catHEC) and sodium deoxycholate (NaDC) or sodium cholate (NaC), which have a similar structure. Turbidity measurements reveal strong interactions between catHEC and NaDC, and under some conditions, macroscopic phase separation occurs. In contrast, the interactions with NaC are weak. At a catHEC concentration of 2 wt %, incipient phase separation is approached at concentrations of NaC and NaDC of 32.5 and 19.3 mM, respectively. The rheological results show strong interactions and a prominent viscosification effect for the catHEC/NaDC system but only moderate interactions for the catHEC/NaC system. Both cryogenic transmission electron microscopy and small-angle X-ray scattering results display fundamental structural differences between the two systems, which may explain the stronger interactions in the presence of NaDC. The surmise is that the extended structures formed in the presence of NaDC can easily form connections and entanglements in the network.
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Affiliation(s)
- Julia
Jianwei Tan
- School
of Pharmacy, Department of Pharmaceutics, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway
| | - Natalie Gjerde
- Department
of Chemistry, ‘‘Sapienza’’
University of Rome, P.O. Box 34, Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Alessandra Del Giudice
- Department
of Chemistry, ‘‘Sapienza’’
University of Rome, P.O. Box 34, Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | | | - Luciano Galantini
- Department
of Chemistry, ‘‘Sapienza’’
University of Rome, P.O. Box 34, Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Guanqun Du
- Division
of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Karin Schillén
- Division
of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Sverre Arne Sande
- School
of Pharmacy, Department of Pharmaceutics, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway
| | - Bo Nyström
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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3
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Zeini D, Glover JC, Knudsen KD, Nyström B. Influence of Lysine and TRITC Conjugation on the Size and Structure of Dextran Nanoconjugates with Potential for Biomolecule Delivery to Neurons. ACS APPLIED BIO MATERIALS 2021; 4:6832-6842. [DOI: 10.1021/acsabm.1c00544] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Darya Zeini
- Department of Chemistry, University of Oslo, Blindern, P.O.
Box 1033, Oslo N-0315, Norway
- Laboratory of Neural Development and Optical Recording (NDEVOR), Department of Molecular Medicine, Institute of Basic Medical Sciences, University of Oslo, P.O.
Box 1103, Oslo N-0317, Norway
| | - Joel C. Glover
- Laboratory of Neural Development and Optical Recording (NDEVOR), Department of Molecular Medicine, Institute of Basic Medical Sciences, University of Oslo, P.O.
Box 1103, Oslo N-0317, Norway
- Norwegian Center for Stem Cell Research, Oslo University Hospital, Oslo N-0317, Norway
| | | | - Bo Nyström
- Department of Chemistry, University of Oslo, Blindern, P.O.
Box 1033, Oslo N-0315, Norway
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4
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Sharker K, Shigeta Y, Ozoe S, Damsongsang P, Hoven VP, Yusa SI. Upper Critical Solution Temperature Behavior of pH-Responsive Amphoteric Statistical Copolymers in Aqueous Solutions. ACS OMEGA 2021; 6:9153-9163. [PMID: 33842784 PMCID: PMC8028163 DOI: 10.1021/acsomega.1c00351] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 03/18/2021] [Indexed: 06/12/2023]
Abstract
Amphoteric statistical equivalent copolymers (P(2VP/NaSS) n ) composed of 2-vinylpyridine (2VP) and anionic sodium p-styrenesulfonate (NaSS) were prepared via reversible addition-fragmentation chain transfer polymerization. The degrees of polymerization (n) were 19 and 95. The monomer reactivity ratio, time conversion profile, and 1H nuclear magnetic resonance diffusion-ordered spectra suggested that the copolymerization of 2VP and NaSS provided statistical or near to random copolymers. P(2VP/NaSS) n exhibited an upper critical solution temperature (UCST) in acidic aqueous solutions on the basis of the charge interactions between the protonated cationic 2VP and anionic NaSS units. With an increase in pH value, the interaction was weakened because of the deprotonation of the 2VP units, thus reducing the UCST. At high [NaCl], the electrostatic interactions among the polymers were weakened because of the screening effect, and again, the UCST was reduced. With an increase in polymer concentration, the intra- and interpolymer interactions increased because of some entanglement, and the UCST consequently increased. Electrostatic interactions among the polymer chains with high molecular weight occurred easier than those among the low-molecular-weight polymer chains, which increased the UCST. The UCST also increased when deuterium oxide was used instead of hydrogen oxide, which was due to the isotopic effect. Hence, the UCST of P(2VP/NaSS) n can be adjusted according to the desired application.
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Affiliation(s)
- Komol
Kanta Sharker
- Department
of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
| | - Yusuke Shigeta
- Tosoh
Finechem Co., 4988 Kaisei-cho, Shunan, Yamaguchi 746-0006, Japan
| | - Shinji Ozoe
- Tosoh
Finechem Co., 4988 Kaisei-cho, Shunan, Yamaguchi 746-0006, Japan
| | - Panittha Damsongsang
- Department
of Chemistry, Faculty of Science, Chulalongkorn
University, Phayathai
Road, Pathumwan, Bangkok 10330, Thailand
| | - Voravee P. Hoven
- Department
of Chemistry, Faculty of Science, Chulalongkorn
University, Phayathai
Road, Pathumwan, Bangkok 10330, Thailand
| | - Shin-ichi Yusa
- Department
of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
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5
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Sharker KK, Shigeta Y, Ozoe S, Yusa SI. Amphoteric Statistical Copolymers with Well-controlled Structure and Upper Critical Solution Temperature in Aqueous Solutions. CHEM LETT 2020. [DOI: 10.1246/cl.200561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Komol Kanta Sharker
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
| | - Yusuke Shigeta
- Tosoh Finechem Co., 4988 Kaisei-cho, Shunan, Yamaguchi 746-0006, Japan
| | - Shinji Ozoe
- Tosoh Finechem Co., 4988 Kaisei-cho, Shunan, Yamaguchi 746-0006, Japan
| | - Shin-ichi Yusa
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
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6
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Zhu K, Pamies R, Al‐Manasir N, Ginés Hernández Cifre J, García de la Torre J, Nyström B, Kjøniksen A. The Effect of Number of Arms on the Aggregation Behavior of Thermoresponsive Poly(N-isopropylacrylamide) Star Polymers. Chemphyschem 2020; 21:1258-1271. [PMID: 32352214 PMCID: PMC7317447 DOI: 10.1002/cphc.202000273] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 04/29/2020] [Indexed: 12/02/2022]
Abstract
The thermoresponsive nature of aqueous solutions of poly(N-isopropylacrylamide) (PNIPAAM) star polymers containing 2, 3, 4, and 6 arms has been investigated by turbidity, dynamic light scattering, rheology, and rheo-SALS. Simulations of the thermosensitive nature of the single star polymers have also been conducted. Some of the samples form aggregates even at temperatures significantly below the lower critical solution temperature (LCST) of PNIPAAM. Increasing concentration and number of arms promotes associations at low temperatures. When the temperature is raised, there is a competition between size increase due to enhanced aggregation and a size reduction caused by contraction. Monte Carlo simulations show that the single stars contract with increasing temperature, and that this contraction is more pronounced when the number of arms is increased. Some samples exhibit a minimum in the turbidity data after the initial increase at the cloud point. The combined rheology and rheo-SALS data suggest that this is due to a fragmentation of the aggregates followed by re-aggregation at even higher temperatures. Although the 6-arm star polymer aggregates more than the other stars at low temperatures, the more compact structure renders it less prone to aggregation at temperatures above the cloud point.
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Affiliation(s)
- Kaizheng Zhu
- Faculty of EngineeringØstfold University CollegeP.O. Box 7001757HaldenNorway
| | - Ramón Pamies
- Department of Material Engineering and ManufacturingTechnical University of Cartagena CartagenaMurcia30202Spain
| | | | | | | | - Bo Nyström
- Department of ChemistryUniversity of OsloP.O. Box 1033, Blindern0315OsloNorway
| | - Anna‐Lena Kjøniksen
- Faculty of EngineeringØstfold University CollegeP.O. Box 7001757HaldenNorway
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7
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Dashtimoghadam E, Salimi-Kenari H, Forooqi Motlaq V, Hasani-Sadrabadi MM, Mirzadeh H, Zhu K, Knudsen KD, Nyström B. Synthesis and temperature-induced self-assembly of a positively charged symmetrical pentablock terpolymer in aqueous solutions. Eur Polym J 2017. [DOI: 10.1016/j.eurpolymj.2017.10.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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8
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Atanase L, Desbrieres J, Riess G. Micellization of synthetic and polysaccharides-based graft copolymers in aqueous media. Prog Polym Sci 2017. [DOI: 10.1016/j.progpolymsci.2017.06.001] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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9
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Nielsen JE, Zhu K, Sande SA, Kováčik L, Cmarko D, Knudsen KD, Nyström B. Structural and Rheological Properties of Temperature-Responsive Amphiphilic Triblock Copolymers in Aqueous Media. J Phys Chem B 2017; 121:4885-4899. [PMID: 28430448 DOI: 10.1021/acs.jpcb.7b01174] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Thermoresponsive amphiphilic biodegradable block copolymers of the type poly(ε-caprolactone-co-lactide)-poly(ethylene glycol)-poly(ε-caprolactone-co-lactide) (PCLA-PEGm-PCLA) have great potential for various biomedical applications. In the present study, we have surveyed the effects of PEG spacer length (m = 1000 and 1500), temperature, and polymer concentration on the self-assembling process to form supramolecular structures in aqueous solutions of the PCLA-PEGm-PCLA copolymer. This copolymer has a lower critical solution temperature, and the cloud point depends on both concentration and PEG length. Thermoreversible hydrogels are formed in the semidilute regime; the gel windows in the phase diagrams can be tuned by the concentration and length of the PEG spacer. The rheological properties of both dilute and semidilute samples were characterized; especially the sol-to-gel transition was examined. Small-angle neutron scattering (SANS) experiments reveal fundamental structural differences between the two copolymers for both dilute and semidilute samples. The intensity profiles for the copolymer with the long PEG spacer could be described by a spherical core-shell model over a broad temperature domain, whereas the copolymer with the short hydrophilic spacer forms rod-like species over an extended temperature range. This finding is supported by cryo-TEM images. At temperatures approaching macroscopic phase separation, both copolymers seem to assume extended rod-like structures.
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Affiliation(s)
- Josefine Eilsø Nielsen
- School of Pharmacy, Department of Pharmaceutics, University of Oslo , P.O. Box 1068, Blindern, N-0316 Oslo, Norway.,Department of Chemistry, University of Oslo , P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Kaizheng Zhu
- Department of Chemistry, University of Oslo , P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Sverre Arne Sande
- School of Pharmacy, Department of Pharmaceutics, University of Oslo , P.O. Box 1068, Blindern, N-0316 Oslo, Norway
| | - Lubomír Kováčik
- Institute of Biology and Medical Genetics, First Faculty of Medicine, Charles University and General University Hospital in Prague , Albertov 4, Prague, 128 01, Czech Republic
| | - Dušan Cmarko
- Institute of Biology and Medical Genetics, First Faculty of Medicine, Charles University and General University Hospital in Prague , Albertov 4, Prague, 128 01, Czech Republic
| | - Kenneth D Knudsen
- Department of Physics, Institute for Energy Technology , P.O. Box 40, N-2027 Kjeller, Norway
| | - Bo Nyström
- Department of Chemistry, University of Oslo , P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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10
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Sun W, An Z, Wu P. UCST or LCST? Composition-Dependent Thermoresponsive Behavior of Poly(N-acryloylglycinamide-co-diacetone acrylamide). Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00020] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Wenhui Sun
- The State Key Laboratory
of Molecular Engineering of Polymers, Department of Macromolecular
Science, Fudan University, Shanghai 200433, China
| | - Zesheng An
- Institute of Nanochemistry and Nanobiology, College of
Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
| | - Peiyi Wu
- The State Key Laboratory
of Molecular Engineering of Polymers, Department of Macromolecular
Science, Fudan University, Shanghai 200433, China
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11
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Dashtimoghadam E, Bahlakeh G, Salimi-Kenari H, Hasani-Sadrabadi MM, Mirzadeh H, Nyström B. Rheological Study and Molecular Dynamics Simulation of Biopolymer Blend Thermogels of Tunable Strength. Biomacromolecules 2016; 17:3474-3484. [PMID: 27766854 DOI: 10.1021/acs.biomac.6b00846] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The temperature-induced gelation of chitosan/glycerophosphate (Chs/GP) systems through physical interactions has shown great potential for various biomedical applications. In the present work, hydroxyethyl cellulose (HEC) was added to the thermosensitive Chs/GP solution to improve the mechanical strength and gel properties of the incipient Chs/HEC/GP gel in comparison with the Chs/GP hydrogel at body temperature. The physical features of the macromolecular complexes formed by the synergistic interaction between chitosan and hydroxyethyl cellulose in the presence of β-glycerophosphate disodium salt solution have been studied essentially from a rheological point of view. The temperature and time sweep rheological characterizations of the thermogelling systems revealed that the sol-gel transition temperature of the Chs/HEC/GP blends is equal to 37 °C at neutral pH; with increasing HEC content in the solutions, more compact networks with considerably improved gel strength are formed without influencing the gelation time. The formed hydrogel matrix has enough mechanical integrity and adequate strength for using it as injectable in situ forming matrices for biomedical applications. The classical Winter-Chambon (W-C) and Fredrickson-Larson (F-L) theories were applied to determine the gel point. In view of the obtained results, it is shown that the F-L theory can be employed as a robust and less tedious method than the W-C approach to precisely determine the gel point in these systems. At the end, molecular simulation studies were conducted by using ab initio quantum mechanics (QM) calculations carried out on Chs and HEC models, and molecular dynamics (MD) simulations of solvated Chs/HEC blend systems showed the binding behavior of Chs/HEC polymers. Analyses of interaction energy, radial distribution function, and hydrogen bonding from simulation studies strongly supported the experimental results; they all disclosed that hydrogen-bond formation between Chs moieties with regard to HEC chains plays an important role for the stabilization of the complexes.
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Affiliation(s)
- Erfan Dashtimoghadam
- Department of Developmental Sciences, Marquette University School of Dentistry , Milwaukee, Wisconsin, United States.,Department of Chemistry, University of Oslo , Oslo, Norway.,Department of Polymer Engineering and Color Technology, Amirkabir University of Technology , Tehran, Iran
| | - Ghasem Bahlakeh
- Department of Engineering and Technology, Golestan University , Aliabad Katool, Iran
| | - Hamed Salimi-Kenari
- Faculty of Engineering and Technology, University of Mazandaran , Babolsar, Iran
| | - Mohammad Mahdi Hasani-Sadrabadi
- Laboratoire de Microsystemes (LMIS4), Institute of Microengineering, Institute of Bioengineering, École Polytechnique Fédérale de Lausanne (EPFL) , Lausanne, Switzerland.,Parker H. Petit Institute for Bioengineering and Bioscience and G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology , Atlanta, Georgia, United States
| | - Hamid Mirzadeh
- Department of Polymer Engineering and Color Technology, Amirkabir University of Technology , Tehran, Iran
| | - Bo Nyström
- Department of Chemistry, University of Oslo , Oslo, Norway
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12
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Khorshid NK, Zhu K, Knudsen KD, Bekhradnia S, Sande SA, Nyström B. Novel Structural Changes during Temperature-Induced Self-Assembling and Gelation of PLGA-PEG-PLGA Triblock Copolymer in Aqueous Solutions. Macromol Biosci 2016; 16:1838-1852. [DOI: 10.1002/mabi.201600277] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 08/19/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Neda Khameh Khorshid
- Department of Chemistry; University of Oslo; P.O. Box 1033 Blindern N-0315 Oslo Norway
| | - Kaizheng Zhu
- Department of Chemistry; University of Oslo; P.O. Box 1033 Blindern N-0315 Oslo Norway
| | - Kenneth D. Knudsen
- Department of Physics; Institute for Energy Technology; P. O. Box 40 N-2027 Kjeller Norway
| | - Sara Bekhradnia
- Department of Chemistry; University of Oslo; P.O. Box 1033 Blindern N-0315 Oslo Norway
| | - Sverre Arne Sande
- School of Pharmacy; Department of Pharmaceutics; University of Oslo; P.O. Box 1068 Blindern N-0316 Oslo Norway
| | - Bo Nyström
- Department of Chemistry; University of Oslo; P.O. Box 1033 Blindern N-0315 Oslo Norway
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13
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First investigation of modified poly(2-vinyl-4,4-dimethylazlactone)s as kinetic hydrate inhibitors. Chem Eng Sci 2016. [DOI: 10.1016/j.ces.2016.06.031] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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14
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Ye Z, Li Y, An Z, Wu P. Exploration of Doubly Thermal Phase Transition Process of PDEGA-b-PDMA-b-PVCL in Water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6691-6700. [PMID: 27299984 DOI: 10.1021/acs.langmuir.6b01785] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Understanding of phase transition mechanism of thermoresponsive polymers is the basis for the rational design of smart materials with predictable properties. Linear ABC triblock terpolymer poly(di(ethylene glycol)ethyl ether acrylate)-b-poly(N,N-dimethylacrylamide)-b-poly(N-vinylcaprolactam) (PDEGA-b-PDMA-b-PVCL) was synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. The doubly thermal phase transition of PDEGA-b-PDMA-b-PVCL in aqueous solution was investigated by a combination of nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), turbidimetry, and dynamic light scattering (DLS). The terpolymer self-assembles into micelles with PDEGA being the core-forming block during the first lower critical solution temperature (LCST) transition corresponding to PDEGA, which is followed by a second LCST transition corresponding to PVCL, resulting in the formation of micellar aggregates. The PDMA middle segment plays an important role as an isolation zone to prevent cooperative dehydration of the PDEGA and PVCL segments, and therefore, two independent LCST transitions corresponding to PDEGA and PVCL were observed. Furthermore, FT-IR with perturbation correlation moving window (PCMW) and two-dimensional spectroscopy (2DCOS) was applied to elucidate the two-step phase transition mechanism of this terpolymer. It was observed that the CH, ester carbonyl, and ether groups of PDEGA change prior to the CH and amide carbonyl groups of PVCL, further supporting that the two phase transitions corresponding to PDEGA and PVCL indeed occur without mutual interferences.
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Affiliation(s)
- Zhangxin Ye
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Polymers and Polymer Composite Materials, Department of Macromolecular Science and Laboratory for Advanced Materials, Fudan University , Shanghai 200433, China
| | - Youcheng Li
- Institute of Nanochemistry and Nanobiology, College of Environmental and Chemical Engineering, Shanghai University , Shanghai 200444, China
| | - Zesheng An
- Institute of Nanochemistry and Nanobiology, College of Environmental and Chemical Engineering, Shanghai University , Shanghai 200444, China
| | - Peiyi Wu
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Polymers and Polymer Composite Materials, Department of Macromolecular Science and Laboratory for Advanced Materials, Fudan University , Shanghai 200433, China
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15
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Lynch B, Crawford K, Baruti O, Abdulahad A, Webster M, Puetzer J, Ryu C, Bonassar LJ, Mendenhall J. The effect of hypoxia on thermosensitive poly(N
-vinylcaprolactam) hydrogels with tunable mechanical integrity for cartilage tissue engineering. J Biomed Mater Res B Appl Biomater 2016; 105:1863-1873. [DOI: 10.1002/jbm.b.33705] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 02/25/2016] [Accepted: 04/21/2016] [Indexed: 02/04/2023]
Affiliation(s)
- Brandon Lynch
- Department of Chemistry; Morehouse College; Atlanta Georgia
| | | | - Omari Baruti
- Department of Chemistry; Morehouse College; Atlanta Georgia
| | - Asem Abdulahad
- Department of Chemistry and Chemical Biology; Rensselaer Polytechnic Institute; Troy New York
| | | | - Jennifer Puetzer
- Department of Biomedical Engineering; Cornell University; Ithaca New York
| | - Chang Ryu
- Department of Chemistry and Chemical Biology; Rensselaer Polytechnic Institute; Troy New York
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16
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Cortez-Lemus NA, Licea-Claverie A. Poly(N-vinylcaprolactam), a comprehensive review on a thermoresponsive polymer becoming popular. Prog Polym Sci 2016. [DOI: 10.1016/j.progpolymsci.2015.08.001] [Citation(s) in RCA: 240] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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17
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Phase behavior, microstructure and cytotoxicity in mixtures of a charged triblock copolymer and an ionic surfactant. Eur Polym J 2016. [DOI: 10.1016/j.eurpolymj.2016.01.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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18
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Isapour G, Lund R, Zhu K, Quan Z, Knudsen KD, Nyström B. Schizophrenic micellization in aqueous solutions of the pH- and temperature responsive pentablock terpolymer PDEAEMAx-b-PNIPAAMy-b-PEGz-b-PNIPAAMy-b-PDEAEMAx. Eur Polym J 2015. [DOI: 10.1016/j.eurpolymj.2015.07.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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19
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Lyngsø J, Al-Manasir N, Behrens MA, Zhu K, Kjøniksen AL, Nyström B, Pedersen JS. Small-Angle X-ray Scattering Studies of Thermoresponsive Poly(N-isopropylacrylamide) Star Polymers in Water. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00057] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Jeppe Lyngsø
- Interdisciplinary
Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
| | - Nodar Al-Manasir
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Manja A. Behrens
- Interdisciplinary
Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
| | - Kaizheng Zhu
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Anna-Lena Kjøniksen
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
- Faculty
of Engineering, Østfold University College, P.O. Box 700, N-1757 Halden, Norway
| | - Bo Nyström
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Jan Skov Pedersen
- Interdisciplinary
Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
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20
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Kahnamouei F, Zhu K, Lund R, Knudsen KD, Nyström B. Self-assembly of a hydrophobically end-capped charged amphiphilic triblock copolymer: effects of temperature and salinity. RSC Adv 2015. [DOI: 10.1039/c5ra07657a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This study elucidates the intricate interplay between hydrophobic and electrostatic interactions in aqueous solutions of a responsive charged triblock copolymer.
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Affiliation(s)
| | - Kaizheng Zhu
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
| | - Reidar Lund
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
| | - Kenneth D. Knudsen
- Department of Physics
- Institute for Energy Technology
- N-2027 Kjeller
- Norway
| | - Bo Nyström
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
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21
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Li W, Wu P. On the thermodynamic phase behavior of poly(N-vinylcaprolactam) solution in the presence of different ionic liquids. Polym Chem 2014. [DOI: 10.1039/c3py01104f] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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22
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Dashtimoghadam E, Mirzadeh H, Taromi FA, Nyström B. Thermoresponsive biopolymer hydrogels with tunable gel characteristics. RSC Adv 2014. [DOI: 10.1039/c4ra05246c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Here we describe the design of thermosensitive biopolymer-based hydrogels with adjustable gel properties.
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Affiliation(s)
- Erfan Dashtimoghadam
- Department of Polymer Engineering and Color Technology
- Amirkabir University of Technology
- Tehran, Iran
- Department of Chemistry
- University of Oslo
| | - Hamid Mirzadeh
- Department of Polymer Engineering and Color Technology
- Amirkabir University of Technology
- Tehran, Iran
| | - Faramarz Afshar Taromi
- Department of Polymer Engineering and Color Technology
- Amirkabir University of Technology
- Tehran, Iran
| | - Bo Nyström
- Department of Chemistry
- University of Oslo
- N-0315 Oslo, Norway
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23
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Quan Z, Zhu K, Knudsen KD, Nyström B, Lund R. Tailoring the amphiphilicity and self-assembly of thermosensitive polymers: end-capped PEG-PNIPAAM block copolymers. SOFT MATTER 2013; 9:10768-10778. [PMID: 25619143 DOI: 10.1039/c3sm51945g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this work we report on the synthesis and self-assembly of a thermo-sensitive block copolymer system of n-octadecyl-poly(ethylene glycol)-block-poly(N-isopropylacrylamide), abbreviated as C18-PEGn-b-PNIPAAMm. We present a facile synthetic strategy for obtaining highly tunable thermo-responsive block copolymers starting from commercial PEG-based surfactants (Brij®) or a C18 precursor and conjugating with PNIPAAM via an Atom Transfer Radical Polymerization (ATRP) protocol. The self-assembly and detailed nanostructure were thoroughly investigated in aqueous solutions using both small-angle X-ray and neutron scattering (SAXS/SANS) combined with turbidity measurements. The results show that the system forms rather well defined classical micellar structures at room temperature that first undergo a collapse, followed by inter-micellar aggregation upon increasing the temperature. For the pure C18-PNIPAAM system, however, rather ill-defined micelles were formed, demonstrating the important role of PEG in regulating the nanostructure and the stability. It is found that the PEG content can be used as a convenient parameter to regulate the thermoresponse, i.e., the onset of collapse and aggregation. A detailed theoretical modeling analysis of the SAXS/SANS data shows that the system forms typical core-shell micellar structures. Interestingly, no evidence of back folding, where PEG allows PNIPAAM to form part of the C18 core, can be found upon crossing the lower critical solution temperature (LCST). This might be attributed to the entropic penalty of folding a polymer chain and/or enthalpic incompatibility between the blocks. The results show that by appropriately varying the balance between the hydrophobic and hydrophilic content, i.e. the amphiphilicity, tunable thermoresponsive micellar structures can be effectively designed. By means of SAXS/SANS we are able to follow the response on the nanoscale. These results thus give considerable insight into thermo-responsive micellar systems and provide guidelines as to how these systems can be tailor-made and designed. This is expected to be of considerable interest for potential applications such as in nanomedicine where an accurate and tunable thermoresponse is required.
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Affiliation(s)
- Zhilong Quan
- College of Materials Science & Engineering, Huaqian University, 361021 Xiamen, P. R. China
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24
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Garnier S, Laschewsky A, Storsberg J. Polymeric Surfactants: Novel Agents with Exceptional Properties. TENSIDE SURFACT DET 2013. [DOI: 10.3139/113.100290] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Abstract
This article presents recent progress in the field of polymeric surfactants made of permanently amphiphilic block copolymers or of stimulus-sensitive ones. We highlight key points in the design of amphiphilic macromolecules, to yield polymer surfactants with tailor-made properties, as well as recently developed and still challenging application fields for this new class of surfactants. The efficiency boosting of amphiphilic block copolymers as co-surfactants in microemulsions is discussed, as are surface modification by polymer surfactants, and stabilization of dispersions. Moreover, the use of block copolymers in nanosciences is presented, for instance as a tool for nanomaterial fabrication, or for biomedical and cosmetic applications in bio-nanotechnology. Finally, self-assembly and applications of some newly developed “exotic” amphiphilic block copolymer structures as new surface-active materials will be highlighted.
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Affiliation(s)
- S. Garnier
- Universität Potsdam, P. O. Box 6015 53, D-14415 Potsdam-Golm (Germany)
| | - A. Laschewsky
- Universität Potsdam, P. O. Box 6015 53, D-14415 Potsdam-Golm (Germany)
- Fraunhofer Institut für Angewandte Polymerforschung FhG-IAP, Geiselbergstr. 69, D-14476 Potsdam-Golm (Germany)
| | - J. Storsberg
- Fraunhofer Institut für Angewandte Polymerforschung FhG-IAP, Geiselbergstr. 69, D-14476 Potsdam-Golm (Germany)
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25
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Bayati S, Zhu K, Trinh LTT, Kjøniksen AL, Nyström B. Effects of Temperature and Salt Addition on the Association Behavior of Charged Amphiphilic Diblock Copolymers in Aqueous Solution. J Phys Chem B 2012; 116:11386-95. [DOI: 10.1021/jp306833x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Solmaz Bayati
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315
Oslo, Norway
| | - Kaizheng Zhu
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315
Oslo, Norway
| | - Loan T. T. Trinh
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315
Oslo, Norway
| | - Anna-Lena Kjøniksen
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315
Oslo, Norway
- Department
of Pharmaceutics,
School of Pharmacy, University of Oslo,
P.O. Box 1068, Blindern, N-0316 Oslo, Norway
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315
Oslo, Norway
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26
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Effects of Hofmeister anions on the flocculation behavior of temperature-responsive poly(N-isopropylacrylamide) microgels. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2689-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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27
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Temperature-responsive self-assembly of charged and uncharged hydroxyethylcellulose-graft-poly(N-isopropylacrylamide) copolymer in aqueous solution. Colloid Polym Sci 2011; 289:993-1003. [PMID: 21765581 PMCID: PMC3109259 DOI: 10.1007/s00396-011-2423-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 03/14/2011] [Accepted: 03/17/2011] [Indexed: 11/21/2022]
Abstract
Temperature-induced interchain association and contraction of species in aqueous solutions of charged (MHEC(−)-g-PNIPAAM) and uncharged (MHEC-g-PNIPAAM) modified hydroxyethylcellulose-graft-poly(N-isopropylacrylamide) copolymer have been studied with the aid of turbidimetry and dynamic light scattering (DLS). It was shown that by attaching PNIPAAM chains to the backbone of a hydrophilic cellulose derivative, a strongly temperature-responsive copolymer could be prepared. The results show an intriguing interplay between interchain association and contraction of the multichain species. The transition zone for compression is narrow, and the compaction effect is promoted by a low polymer concentration and charges on the polymer moieties. The findings from DLS revealed two populations of species, namely molecularly dispersed molecules or small clusters and interchain complexes, which exhibit temperature-induced collapse. The magnitude of the cluster contraction can be modulated by changing the polymer concentration and charge density of the copolymer.
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28
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Maleki A, Kjøniksen AL, Zhu K, Nyström B. Temperature-Induced Aggregation Kinetics in Aqueous Solutions of a Temperature-Sensitive Amphiphilic Block Copolymer. J Phys Chem B 2011; 115:8975-80. [DOI: 10.1021/jp202607p] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Atoosa Maleki
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
- Department of Pharmacy, School of Pharmacy, University of Oslo, Oslo, Norway
| | - Anna-Lena Kjøniksen
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
- Department of Pharmacy, School of Pharmacy, University of Oslo, Oslo, Norway
| | - Kaizheng Zhu
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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29
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Kelland MA. Tuning the thermoresponsive properties of hyperbranched poly(ester amide)s based on diisopropanolamine and cyclic dicarboxylic anhydrides. J Appl Polym Sci 2011. [DOI: 10.1002/app.33942] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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30
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Kjøniksen AL, Zhu K, Behrens MA, Pedersen JS, Nyström B. Effects of temperature and salt concentration on the structural and dynamical features in aqueous solutions of charged triblock copolymers. J Phys Chem B 2011; 115:2125-39. [PMID: 21338148 DOI: 10.1021/jp1075884] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Effects of temperature and salt addition on the association behavior in aqueous solutions of a series of charged thermosensitive methoxypoly(ethylene glycol)-block-poly(N-isopropylacrylamide)-block-poly(4-styrenesulfonic acid sodium) triblock copolymers (MPEG(45)-b-P(NIPAAM)(n)-b-P(SSS)(22)) with different lengths of the PNIPAAM block (n=17, 48, and 66) have been studied with the aid of turbidity, small-angle X-ray scattering (SAXS), and dynamic light scattering (DLS). Increasing temperature and salinity as well as longer PNIPAAM blocks are all factors that promote the formation of association structures. The SAXS data show that, for the copolymers with n=48 and n=66, increasing temperature and salt concentration induce interchain associations and higher values of the aggregation number, whereas no aggregation was observed for the copolymer with the shortest PNIPAAM chain. However, DLS measurements reveal the presence of larger association clusters. The cloud point is found to decrease with raising salinity and longer PNIPAAM block. The general picture that emerges is the delicate interplay between repulsive electrostatic forces and hydrophobic interactions and that this balance can be tuned by changing the temperature, salinity, and the length of the PNIPAAM block.
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Affiliation(s)
- Anna-Lena Kjøniksen
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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31
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Characterization of polyelectrolyte features in polysaccharide systems and mucin. Adv Colloid Interface Sci 2010; 158:108-18. [PMID: 19482258 DOI: 10.1016/j.cis.2009.05.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2009] [Revised: 04/23/2009] [Accepted: 05/11/2009] [Indexed: 11/22/2022]
Abstract
This review elucidates several aspects on the behavior of charged polysaccharides and mucin. Viscosification of dilute aqueous solutions of hyaluronan (HA) occurs in the course of time at low shear flow, whereas shear thinning as time evolves is found at moderate shear rates. Hydrogen bonds and electrostatic interaction play an important role for the emergence of these features. No time effect of the viscosity is observed for semidilute HA solutions. A degradation of HA is observed at low and high pH and this effect continues over long times, and it is only in the approximate interval 5<pH<10 that HA is stable. Small angle neutron scattering (SANS) measurements on semidilute aqueous solutions of mucin at pH=7 reveal a fractal dimension of 1.4, and the effect of temperature is insignificant on the fractal structure. This suggests that the mucin chains on a semi-local dimensional scale are rod-like. From various experimental methods on solutions of mucin it was found that at pH values around 2 (uncharged polymer), the intensive hydrophobic interactions lead to large association complexes, whereas at pH>>2 the negative charges suppress the tendency of forming associations. At pH<2, the mucin chains are compressed and they are decorated by some positive charges. In the semidilute regime, a fragmented network is developed. The intense association in semidilute solutions of mucin at pH=2 is further supported by the results from rheo-small angle light scattering measurements. Effects of ionic strength on the radius of gyration (R(g)) for dilute solutions of HA (pH=7) and positively charged hydroxyethylcellulose (HEC(+)) are studied with the aid of Monte Carlo simulations, and essential features of the polyelectrolyte effect on R(g) are captured in the computer simulation. Strong interactions are observed in aqueous mixtures of an anionic polysaccharide (HEC(-)) and an oppositely charged surfactant (cetyltrimethylammonium bromide; CTAB); this gives rise to extensive associations and macroscopic phase separation is approached. The massive association complexes are disclosed in the SANS experiments by a pronounced upturn in the scattered intensity at low values of the wave vector.
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32
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Beheshti N, Kjøniksen AL, Zhu K, Knudsen KD, Nyström B. Viscosification in Polymer−Surfactant Mixtures at Low Temperatures. J Phys Chem B 2010; 114:6273-80. [DOI: 10.1021/jp100333f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Neda Beheshti
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway, Department of Pharmaceutics, School of Pharmacy, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway, and Department of Physics, Institute for Energy Technology, P.O. Box 40, N-2027 Kjeller, Norway
| | - Anna-Lena Kjøniksen
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway, Department of Pharmaceutics, School of Pharmacy, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway, and Department of Physics, Institute for Energy Technology, P.O. Box 40, N-2027 Kjeller, Norway
| | - Kaizheng Zhu
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway, Department of Pharmaceutics, School of Pharmacy, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway, and Department of Physics, Institute for Energy Technology, P.O. Box 40, N-2027 Kjeller, Norway
| | - Kenneth D. Knudsen
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway, Department of Pharmaceutics, School of Pharmacy, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway, and Department of Physics, Institute for Energy Technology, P.O. Box 40, N-2027 Kjeller, Norway
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway, Department of Pharmaceutics, School of Pharmacy, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway, and Department of Physics, Institute for Energy Technology, P.O. Box 40, N-2027 Kjeller, Norway
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33
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Volden S, Kjøniksen AL, Zhu K, Genzer J, Nyström B, Glomm WR. Temperature-dependent optical properties of gold nanoparticles coated with a charged diblock copolymer and an uncharged triblock copolymer. ACS NANO 2010; 4:1187-1201. [PMID: 20078133 DOI: 10.1021/nn901517u] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We demonstrate that the optical properties of gold nanoparticles can be used to detect and follow stimuli-induced changes in adsorbed macromolecules. Specifically, we investigate thermal response of anionic diblock and uncharged triblock copolymers based on poly(N-isopropylacrylamide) (PNIPAAM) blocks adsorbed onto gold nanoparticles and planar gold surfaces in a temperature range between 25 and 60 degrees C. By employing a palette of analytical probes, including UV-visible spectroscopy, dynamic light scattering, fluorescence, and quartz crystal microbalance with dissipation monitoring, we establish that while the anionic copolymer forms monolayers at both low and high temperature, the neutral copolymer adsorbs as a monolayer at low temperatures and forms multilayers above the cloud point (T(C)). Raising the temperature above T(C) severely affects the optical properties of the gold particle/polymer composites, expelling associated water and altering the immediate surroundings of the gold nanoparticles. This effect, stronger for the uncharged polymer, is related to the amount of polymer adsorbed on the surface, where a denser shell influences the surface plasmon band to a greater degree. This is corroborated with light scattering experiments, which reveal that flocculation of the neutral polymer-coated particles occurs at high temperatures. The flocculation behavior of the neutral copolymer on planar gold surfaces results in multilayer formation. The observed effects are discussed within the framework of the Mie-Drude theory.
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Affiliation(s)
- Sondre Volden
- Department of Chemical Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
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34
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Zhang L, Liang Y, Meng L. Thermo-sensitive amphiphilic poly(N
-vinylcaprolactam) copolymers: synthesis and solution properties. POLYM ADVAN TECHNOL 2009. [DOI: 10.1002/pat.1495] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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35
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Kjøniksen AL, Zhu K, Karlsson G, Nyström B. Novel transition behavior in aqueous solutions of a charged thermoresponsive triblock copolymer. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2008.09.024] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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36
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Thermal response of low molecular weight poly-(N-isopropylacrylamide) polymers in aqueous solution. Polym Bull (Berl) 2008. [DOI: 10.1007/s00289-008-0029-4] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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37
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Zhu K, Pamies R, Kjøniksen AL, Nyström B. Temperature-induced intermicellization of "hairy" and "crew-cut" micelles in an aqueous solution of a thermoresponsive copolymer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:14227-14233. [PMID: 19360967 DOI: 10.1021/la8030073] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Temperature-induced intermicellar structures in aqueous solutions of the thermoresponsive methoxypoly(ethylene glycol)-block-poly(N-isopropylacrylamide) (MPEGn-b-NIPAAM71) copolymer that exhibit a lower critical solution temperature were studied by means of turbidimetry, dynamic light scattering (DLS), shear viscosity, and rheo small-angle light scattering (rheo-SALS) methods. The length of the hydrophilic chains (MPEG) of the copolymer varies from n=0 to n=114. It is shown that this change has a major impact on the temperature-induced association behavior of the polymer in solution. The turbidity results at quiescent conditions revealed a transition peak in the turbidity curve at intermediate temperatures, and this peak as well as the cloud point is shifted toward higher temperatures with increasing length of the hydrophilic chains of the copolymer. The DLS measurements disclosed a fast and a slow relaxation mode, which both are diffusive. From the fast and slow relaxation times the sizes of unimers/micelles and intermicellar clusters, respectively, can be determined. The temperature-induced aggregation is less pronounced in solutions of copolymers with long hydrophilic chains, and the intermicellar structures exhibit an interesting transition at intermediate temperatures. In the shear viscosity measurements large association complexes are formed at high temperatures and at low shear flow for the polymers with short hydrophilic chains, whereas at high shear rates breakup of interaggregate chains was observed. For the copolymer with the highest number of hydrophilic chains (n=114), a novel transition peak was found in the viscosity data. The rheo-SALS results divulged shear-induced structural changes of the association complexes at elevated temperatures. For copolymers with short hydrophilic chains, shear-induced disruption of association complexes was found at higher temperatures, whereas for hairy micelles augmented shear flow promoted the growth of complexes.
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Affiliation(s)
- Kaizheng Zhu
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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38
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Temperature-induced intermicellization and contraction in aqueous mixtures of sodium dodecyl sulfate and an amphiphilic diblock copolymer. J Colloid Interface Sci 2008; 326:76-88. [DOI: 10.1016/j.jcis.2008.07.039] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2008] [Revised: 07/18/2008] [Accepted: 07/18/2008] [Indexed: 11/15/2022]
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39
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Beheshti N, Zhu K, Kjøniksen AL, Nyström B. Interaction behaviors in aqueous solutions of negatively and positively charged hydrophobically modified hydroxyethylcellulose in the presence of an anionic surfactant. Colloids Surf A Physicochem Eng Asp 2008. [DOI: 10.1016/j.colsurfa.2008.06.030] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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40
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Kjøniksen AL, Laukkanen A, Tenhu H, Nyström B. Anomalous turbidity, dynamical, and rheological properties in aqueous mixtures of a thermoresponsive PVCL-g-C11EO42 copolymer and an anionic surfactant. Colloids Surf A Physicochem Eng Asp 2008. [DOI: 10.1016/j.colsurfa.2007.09.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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41
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Kjøniksen AL, Zhu K, Pamies R, Nyström B. Temperature-Induced Formation and Contraction of Micelle-Like Aggregates in Aqueous Solutions of Thermoresponsive Short-Chain Copolymers. J Phys Chem B 2008; 112:3294-9. [DOI: 10.1021/jp800404a] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Anna-Lena Kjøniksen
- Department of Chemistry, University of Oslo, P. O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Kaizheng Zhu
- Department of Chemistry, University of Oslo, P. O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Ramón Pamies
- Department of Chemistry, University of Oslo, P. O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P. O. Box 1033, Blindern, N-0315 Oslo, Norway
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Rakhmatullina E, Braun T, Chami M, Malinova V, Meier W. Self-organization behavior of methacrylate-based amphiphilic di- and triblock copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:12371-12379. [PMID: 17949024 DOI: 10.1021/la7023132] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Amphiphilic di- and triblock copolymers having different hydrophilic-to-hydrophobic block length ratio were synthesized using ATRP. The self-assembly behavior of these AB and ABA block copolymers consisting of poly(n-butyl methacrylate) (B) and poly(2,2-(dimethylaminoethyl methacrylate) (A) was investigated using a combination of dynamic light scattering, negative-stain transmission electron microscopy, cryoelectron microscopy, and atomic force microscopy. Two populations of self-organized structures in aqueous solution, micelles and compound micelles, were detected for diblock copolymers. Triblock copolymers assembled into vesicular structures of uniform sizes. Furthermore it was found that these vesicles tended to compensate the high curvature by additional organization of the polymer chains outside of the membrane. The chain hydrophilicity of the polymers appeared to have a critical impact on the self-assembly response toward temperature change. The self-reorganization of the polymers at different temperatures is discussed.
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Dimitrov I, Trzebicka B, Müller AH, Dworak A, Tsvetanov CB. Thermosensitive water-soluble copolymers with doubly responsive reversibly interacting entities. Prog Polym Sci 2007. [DOI: 10.1016/j.progpolymsci.2007.07.001] [Citation(s) in RCA: 540] [Impact Index Per Article: 31.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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44
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Radu JÉF, Novak L, Hartmann JF, Beheshti N, Kjøniksen AL, Nyström B, Borbély J. Structural and dynamical characterization of poly-gamma-glutamic acid-based cross-linked nanoparticles. Colloid Polym Sci 2007. [DOI: 10.1007/s00396-007-1776-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Zhu K, Jin H, Kjøniksen AL, Nyström B. Anomalous Transition in Aqueous Solutions of a Thermoresponsive Amphiphilic Diblock Copolymer. J Phys Chem B 2007; 111:10862-70. [PMID: 17718473 DOI: 10.1021/jp074163m] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The influence of shear flow on aggregation and disaggregation in aqueous solutions of the thermoresponsive methoxy-poly(ethylene glycol)-block-poly(N-isopropylacrylamide) (MPEG53-b-PNIPAAM113) copolymer that exhibits a lower critical solution temperature was investigated with the aid of turbidity, shear viscosity, and rheo small angle light scattering (rheo-SALS) methods. The turbidity results at quiescent conditions revealed a novel transition peak in the turbidity curve at intermediate temperatures, which reflects the delicate interplay between temperature-induced aggregation and shrinking of the species. A similar anomalous transition peak (located at the same temperature) was observed in the steady shear viscosity measurements at intermediate temperatures, and the amplitude of the peak was reduced with increasing shear rate as a consequence of breakup of interaggregate chains. At low temperatures (low sticking probability), enhanced shear rate generated interpolymer aggregates; whereas in the high-temperature domain (high sticking probability) association structures were broken up as the shear rate was increased. The rheo-SALS experiments disclosed growth of aggregates at low temperatures and destruction of association complexes at high temperatures. An increase of the cloud point temperature with rising shear rate is reported, which is interpreted as being a disruption of clusters under the influence of shear stresses.
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Affiliation(s)
- Kaizheng Zhu
- Department of Chemistry, University of Oslo, Norway
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46
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Bu H, Naess SN, Beheshti N, Zhu K, Knudsen KD, Kjøniksen AL, Elgsaeter A, Nyström B. Characterization of thermally sensitive interactions in aqueous mixtures of hydrophobically modified hydroxyethylcellulose and cyclodextrins. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:9023-9. [PMID: 17014149 DOI: 10.1021/la0608664] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Effects of beta-cyclodextrin (beta-CD) or hydroxypropyl-beta-cyclodextrin (HP-beta-CD) addition and temperature on thermodynamic, rheological, and structural features of semidilute solutions of hydroxyethylcellulose (HEC) and its hydrophobically modified analogue (HM-HEC) are reported. Differential scanning calorimetric (DSC) measurements revealed a thermally induced crystal melting transition of beta-CD at high concentrations in solutions of HEC and HM-HEC. No transition with HP-beta-CD was observed in aqueous solution. Viscosity results indicated that at a cosolute concentration of 2 mm, the beta-CD units are threaded onto hydrophobic tails of HM-HEC (C16 groups) to form columnar structures. This arrangement is more effective in the encapsulation of the hydrophobic chains than the monomer hydrophobic deactivation accomplished by the HP-beta-CD units. At cosolute concentrations above 8 mm, no further decoupling of the hydrophobic interactions occurs for any of the cosolutes. Small-angle neutron scattering (SANS) experiments on HM-HEC/beta-CD mixtures suggest that the large-scale association structures in HM-HEC/D(2)O solutions are reduced upon addition of beta-CD, and an interesting temperature effect is observed at 2 mm beta-CD addition. At high beta-CD concentrations and low temperatures, the formation of large beta-CD clusters or crystallites generates cross-links in the HEC and HM-HEC networks, resulting in a viscosity enhancement of several orders of magnitude. This strong temperature effect is not reflected in the structural features probed by SANS.
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Affiliation(s)
- Huaitian Bu
- Department of Chemistry, University of Oslo, N-0315 Oslo, Norway
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47
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48
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Structure and dynamics of aqueous mixtures of an anionic cellulose derivative and anionic or cationic surfactants. Colloids Surf A Physicochem Eng Asp 2006. [DOI: 10.1016/j.colsurfa.2005.12.031] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Beheshti N, Bu H, Zhu K, Kjøniksen AL, Knudsen KD, Pamies R, Hernandez Cifre JG, García de la Torre J, Nyström B. Characterization of Interactions in Aqueous Solutions of Hydroxyethylcellulose and Its Hydrophobically Modified Analogue in the Presence of a Cyclodextrin Derivative. J Phys Chem B 2006; 110:6601-8. [PMID: 16570960 DOI: 10.1021/jp056828v] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The formation of associative networks in semidilute aqueous solutions of hydrophobically modified hydroxyethylcellulose (HM-HEC) is dependent on intermolecular hydrophobic interactions. Addition of hydroxypropyl-beta-cyclodextrin (HP-beta-CD) monomers to the system provides decoupling of these associations via inclusion complex formation with the polymer hydrophobic tails. Results from viscosity, polymer NMR self-diffusion, and dynamic light scattering (DLS) measurements show that the hydrophobic interactions in HM-HEC solutions are effectively suppressed when the level of HP-beta-CD addition increases. Small-angle neutron scattering (SANS) results reveal that the large-scale association complexes in HM-HEC solutions are strongly diminished when the concentration of HP-beta-CD rises. The time correlation data obtained from the DLS experiments unveiled the existence of two relaxation modes: one single exponential at short times followed by a stretched exponential at longer times. The fast mode is always diffusive, whereas the slow mode exhibits progressively stronger wavevector dependence as the intensity of the hydrophobic interactions increases. This feature, as well as the accompanying drop of the stretched exponential beta as the HP-beta-CD concentration decreases, is attributed to enhanced hydrophobic interactions and can be well rationalized in the framework of the coupling model of Ngai.
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Affiliation(s)
- Neda Beheshti
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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Kjøniksen AL, Galant C, Knudsen KD, Nguyen GTM, Nyström B. Effects of β-Cyclodextrin Addition and Temperature on the Modulation of Hydrophobic Interactions in Aqueous Solutions of an Associative Alginate. Biomacromolecules 2005; 6:3129-36. [PMID: 16283737 DOI: 10.1021/bm050458z] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Novel information about the effects of beta-cyclodextrin (beta-CD) addition and temperature on structural and rheological features of semidilute solutions of alginate and its hydrophobically modified analogue (HM-alginate) is given. Enhanced turbidity is observed for the HM-alginate solutions at high levels of beta-CD addition and low temperatures. The viscosity results revealed cross-linking of the alginate chains at high beta-CD concentrations and low temperatures. Rheological results for the HM-alginate solutions demonstrated that high levels of beta-CD addition and elevated temperatures promoted decoupling of the hydrophobic polymer-polymer associations via inclusion complex formation between beta-CD cavities and the hydrophobic side chains of the polymer. Analysis of small-angle neutron scattering (SANS) results from HM-alginate solutions in the presence of beta-CD suggested that the polymer chains are locally stretched at all of the considered levels of beta-CD and temperatures. The SANS results revealed association structures. The general picture that emerges is that beta-CD addition and temperature can be combined to tune the intensity of the hydrophobic interactions and to cross-link the unmodified alginate.
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Affiliation(s)
- Anna-Lena Kjøniksen
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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