1
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Winning D, Wychowaniec JK, Wu B, Heise A, Rodriguez BJ, Brougham DF. Thermoresponsiveness Across the Physiologically Accessible Range: Effect of Surfactant, Cross-Linker, and Initiator Content on Size, Structure, and Transition Temperature of Poly( N-isopropylmethacrylamide) Microgels. ACS OMEGA 2024; 9:36185-36197. [PMID: 39220537 PMCID: PMC11360016 DOI: 10.1021/acsomega.4c02115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 07/20/2024] [Accepted: 07/29/2024] [Indexed: 09/04/2024]
Abstract
The influence of surfactant, cross-linker, and initiator on the final structure and thermoresponse of poly(N-isopropylmethacrylamide) (pNIPMAM) microgels was evaluated. The goals were to control particle size (into the nanorange) and transition temperature (across the physiologically accessible range). The concentration of the reactants used in the synthesis was varied, except for the monomer, which was kept constant. The thermoresponsive suspensions formed were characterized by dynamic light scattering, small-angle X-ray scattering, atomic force microscopy, and rheology. Increasing surfactant, sodium dodecyl sulfate content, produced smaller microgels, as expected, into the nanorange and with greater internal entanglement, but with no change in phase transition temperature (LCST), which is contrary to previous reports. Increasing cross-linker, N,N-methylenebis acrylamide, content had no impact on particle size but reduced particle deformability and, again contrary to previous reports of decreases, progressively increased the LCST from 39 to 46 °C. The unusual LCST trends were confirmed using different rheological techniques. Initiator, potassium persulfate, content was found to weakly influence the outcomes. An optimized content was identified that provides functional nanogels in the 100 nm (swollen) size range with controlled LCST, just above physiological temperature. The study contributes chemistry-derived design rules for thermally responsive colloidal particles with physiologically accessible LCST for a variety of biomedical and soft robotics applications.
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Affiliation(s)
- Danielle Winning
- School
of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Jacek K. Wychowaniec
- School
of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
- AO
Research Institute Davos, Clavadelerstrasse 8, 7270 Davos, Switzerland
| | - Bing Wu
- Dutch-Belgian
Beamline (DUBBLE), European Synchrotron Radiation Facility (ESRF), 71 Avenue Des Martyrs, CS 40220, Grenoble 38043, France
| | - Andreas Heise
- Department
of Chemistry, Royal College of Surgeons
in Ireland, Dublin 9, Ireland
| | - Brian J. Rodriguez
- Conway
Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland
- School of
Physics, University College Dublin, Belfield, Dublin 4, Ireland
| | - Dermot F. Brougham
- School
of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
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2
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Šťastná J, Ivaniuzhenkov V, Hanyková L. External Stimuli-Responsive Characteristics of Poly( N,N'-diethylacrylamide) Hydrogels: Effect of Double Network Structure. Gels 2022; 8:586. [PMID: 36135298 PMCID: PMC9498466 DOI: 10.3390/gels8090586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 09/09/2022] [Accepted: 09/13/2022] [Indexed: 11/30/2022] Open
Abstract
Swelling experiments and NMR spectroscopy were combined to study effect of various stimuli on the behavior of hydrogels with a single- and double-network (DN) structure composed of poly(N,N'-diethylacrylamide) and polyacrylamide (PAAm). The sensitivity to stimuli in the DN hydrogel was found to be significantly affected by the introduction of the second component and the formation of the double network. The interpenetrating structure in the DN hydrogel causes the units of the component, which is insensitive to the given stimulus in the form of the single network (SN) hydrogel, to be partially formed as globular structures in DN hydrogel. Due to the hydrophilic PAAm groups, temperature- and salt-induced changes in the deswelling of the DN hydrogel are less intensive and gradual compared to those of the SN hydrogel. The swelling ratio of the DN hydrogel shows a significant decrease in the dependence on the acetone content in acetone-water mixtures. A certain portion of the solvent molecules bound in the globular structures was established from the measurements of the 1H NMR spin-spin relaxation times T2 for the studied DN hydrogel. The time-dependent deswelling and reswelling kinetics showed a two-step profile, corresponding to the solvent molecules being released and absorbed during two processes with different characteristic times.
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Affiliation(s)
| | | | - Lenka Hanyková
- Department of Macromolecular Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic
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3
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Chen X, Yu H, Wang L, Wang N, Zhang Q, Zhou W, Uddin MA. Preparation of phenylboronic acid‐based hydrogel microneedle patches for glucose‐dependent insulin delivery. J Appl Polym Sci 2020. [DOI: 10.1002/app.49772] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Xiang Chen
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering Zhejiang University Hangzhou China
| | - Haojie Yu
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering Zhejiang University Hangzhou China
| | - Li Wang
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering Zhejiang University Hangzhou China
| | - Nan Wang
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering Zhejiang University Hangzhou China
| | - Qian Zhang
- The First Affiliated Hospital, College of Medicine Zhejiang University Hangzhou China
| | - Weibin Zhou
- The First Affiliated Hospital, College of Medicine Zhejiang University Hangzhou China
| | - Md Alim Uddin
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering Zhejiang University Hangzhou China
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4
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Krakovský I, Hanyková L, Paladini G, Almásy L. SANS and NMR study on nanostructure of thermoresponsive double network hydrogels. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2020.109929] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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5
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Zhao X, Liang J, Shan G, Pan P. High strength of hybrid double-network hydrogels imparted by inter-network ionic bonds. J Mater Chem B 2019; 7:324-333. [DOI: 10.1039/c8tb02803f] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Interaction between networks has been proven to be of importance for mechanical property enhancement of double-network (DN) hydrogels.
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Affiliation(s)
- Xiaoyan Zhao
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering
- Zhejiang University
- Hangzhou 310027
- China
| | - Jun Liang
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering
- Zhejiang University
- Hangzhou 310027
- China
| | - Guorong Shan
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering
- Zhejiang University
- Hangzhou 310027
- China
| | - Pengju Pan
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering
- Zhejiang University
- Hangzhou 310027
- China
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6
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Nanogels of poly-N-isopropylacrylamide, poly-N,N-diethylacrylamide and acrylic acid for controlled release of thymol. JOURNAL OF POLYMER RESEARCH 2018. [DOI: 10.1007/s10965-018-1644-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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7
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Li X, Li X, Shi X, Qiu G, Lu X. Thermosensitive DEA/DMA copolymer nanogel: Low initiator induced synthesis and structural colored colloidal array’s optical properties. Eur Polym J 2017. [DOI: 10.1016/j.eurpolymj.2017.08.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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8
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Bakaic E, Smeets NMB, Barrigar O, Alsop R, Rheinstädter MC, Hoare T. pH-Ionizable in Situ Gelling Poly(oligo ethylene glycol methacrylate)-Based Hydrogels: The Role of Internal Network Structures in Controlling Macroscopic Properties. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01505] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Emilia Bakaic
- Department
of Chemical Engineering and ‡Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4L8
| | - Niels M. B. Smeets
- Department
of Chemical Engineering and ‡Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4L8
| | - Owen Barrigar
- Department
of Chemical Engineering and ‡Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4L8
| | - Richard Alsop
- Department
of Chemical Engineering and ‡Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4L8
| | - Maikel C. Rheinstädter
- Department
of Chemical Engineering and ‡Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4L8
| | - Todd Hoare
- Department
of Chemical Engineering and ‡Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4L8
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9
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Cheng J, Shan G, Pan P. Triple Stimuli-Responsive N-Isopropylacrylamide Copolymer toward Metal Ion Recognition and Adsorption via a Thermally Induced Sol–Gel Transition. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.6b03626] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Jinjin Cheng
- State Key Laboratory of Chemical
Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Guorong Shan
- State Key Laboratory of Chemical
Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Pengju Pan
- State Key Laboratory of Chemical
Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
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10
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Xiao J, Shi C, Li Y, Pan Y, Huang Q. Pickering emulsions immobilized within hydrogel matrix with enhanced resistance against harsh processing conditions and sequential digestion. Food Hydrocoll 2017. [DOI: 10.1016/j.foodhyd.2016.07.025] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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11
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Wang L, Shan G, Pan P. Highly enhanced toughness of interpenetrating network hydrogel by incorporating poly(ethylene glycol) in first network. RSC Adv 2014. [DOI: 10.1039/c4ra11494a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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12
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PANG JUAN, YANG HU, MA JING, CHENG RONGSHI. UNDERSTANDING DIFFERENT LCST LEVELS OF POLY(N-ALKYLACRYLAMIDE)S BY MOLECULAR DYNAMICS SIMULATIONS AND QUANTUM MECHANICS CALCULATIONS. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2012. [DOI: 10.1142/s0219633611006505] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Poly(N-alkylacrylamide) is a group of thermo-sensitive polymers that include poly (N-isopropylacrylamide), poly(N-n-propylacrylamide), poly(N-isopropylmethacryl-amide), and so on. The polymers exhibit different levels of lower critical solution temperatures (LCST) in aqueous solutions. In this article, their monomers and oligomers with 10 repeating units are selected, respectively, to demonstrate the cause of different LCST levels of the polymers in aqueous solutions using molecular dynamics simulations and quantum mechanics calculations. The monomers have functional groups of different steric volume that greatly affect the conformational transition of chains and LCST levels of the polymers. A branched chain of N-propyl group in N-isopropylacrylamide and an additional methyl group at α-carbon in N-isopropylmethacrylamide both increase the steric effect, making it more difficult for monomers to draw closer and resulting in higher LCST levels of the polymers. In addition, the simulated results from their corresponding oligomers exhibit the similar trend to those from the monomers.
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Affiliation(s)
- JUAN PANG
- Department of Polymer Science and Engineering, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P. R. China
| | - HU YANG
- Department of Polymer Science and Engineering, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P. R. China
| | - JING MA
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P. R. China
| | - RONGSHI CHENG
- Department of Polymer Science and Engineering, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P. R. China
- Polymer Institute, College of Material Science and Engineering, South China University of Technology, Guangzhou, 510640, P. R. China
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13
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Zhang Y, Liu T, Wang Q, Zhao J, Fang J, Shen W. Synthesis of novel poly(N,N-diethylacrylamide-co-acrylic acid) (P(DEA-co-AA)) microgels as carrier of horseradish peroxidase immobilization for pollution treatment. Macromol Res 2012. [DOI: 10.1007/s13233-012-0044-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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14
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Delaittre G, Save M, Gaborieau M, Castignolles P, Rieger J, Charleux B. Synthesis by nitroxide-mediated aqueous dispersion polymerization, characterization, and physical core-crosslinking of pH- and thermoresponsive dynamic diblock copolymer micelles. Polym Chem 2012. [DOI: 10.1039/c2py20084h] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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15
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Sonochemical synthesis and characterisation of thermoresponsive microgel particles. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.01.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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16
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Castelletto V, Newby GE, Zhu Z, Hamley IW, Noirez L. Self-assembly of PEGylated peptide conjugates containing a modified amyloid beta-peptide fragment. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:9986-96. [PMID: 20450168 DOI: 10.1021/la100110f] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The self-assembly of PEGylated peptides containing a modified sequence from the amyloid beta peptide, FFKLVFF, has been studied in aqueous solution. PEG molar masses PEG1k, PEG2k, and PEG10k were used in the conjugates. It is shown that the three FFKLVFF-PEG hybrids form fibrils comprising a FFKLVFF core and a PEG corona. The beta-sheet secondary structure of the peptide is retained in the FFKLVFF fibril core. At sufficiently high concentrations, FFKLVFF-PEG1k and FFKLVFF-PEG2k form a nematic phase, while PEG10k-FFKLVFF exhibits a hexagonal columnar phase. Simultaneous small angle neutron scattering/shear flow experiments were performed to study the shear flow alignment of the nematic and hexagonal liquid crystal phases. On drying, PEG crystallization occurs without disruption of the FFKLVFF beta-sheet structure leading to characteristic peaks in the X-ray diffraction pattern and FTIR spectra. The stability of beta-sheet structures was also studied in blends of FFKLVFF-PEG conjugates with poly(acrylic acid) (PAA). While PEG crystallization is only observed up to 25% PAA content in the blends, the FFKLVFF beta-sheet structure is retained up to 75% PAA.
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Affiliation(s)
- V Castelletto
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
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18
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Kano M, Kokufuta E. On the temperature-responsive polymers and gels based on N-propylacrylamides and N-propylmethacrylamides. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:8649-8655. [PMID: 19323452 DOI: 10.1021/la804286j] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We studied the behavior in water of polymers, microgels, and macrogels based on the following four monomers: N-isopropylacrylamide (NiPA), N-isopropylmethacrylamide (NiPMA), N-n-propylacrylamide (NnPA), and N-n-propylmethacrylamide (NnPMA). The thermal phase separation of polymers in water as well as of microgels in the aqueous dispersion was examined by a combination of turbidity measurements and differential scanning calorimetry (DSC). The hydrodynamic radius of microgels and the swelling degree of macrogels (fine cylindrical bulk gels) were also examined as a function of temperature using the dynamic light scattering and the microscopic method, respectively. It was found that all the polymers prepared are water-soluble and clearly exhibit the phase separation on heating. The phase separation temperature varies depending on the constituent monomers and becomes higher in the order of NiPMA > NiPA > NnPMA > NnPA. The endothermic enthalpy from the heating DSC curves increases in the order of NnPMA > NnPA approximately NiPMA > NiPA. The same trends were observed in the microgels based on NiPA, NiPMA, and NnPA, which were synthesized via chemical cross-linking with N,N'-methylenebis(acrylamide) (Bis). Although we were unable to synthesize the microgel of NnPMA due to a low water solubility of the monomer, its bulk gel was obtained by gamma-ray irradiation to an aqueous poly(NnPMA) solution at a dose of 10 kGy. An irradiation-cross-linked NiPMA gel was also prepared as a counterpart to the Bis-cross-linked gel. We then studied the gel collapses upon heating by use of the chemically cross-linked gels based on NiPA, NiPMA, and NnPA as well as of the irradiation-cross-linked NnPMA and NiPMA gels. All the gels underwent the collapse transition at a certain temperature which is close to or slightly higher than the phase separation temperature of the corresponding polymer solutions or microgel dispersions. These results indicate that in both the linear and cross-linked polymers there is no difference in the thermally induced interactions between the segments as well as between the segment and the solvent, but these interactions are dependent on the structure of the constituent monomers, i.e., whether the alpha-carbon bears a hydrogen atom or a methyl group and whether the N-propyl group is branched or straight chain. The structure dependence was discussed in terms of amide-amide and amide-water hydrogen bondings as well as of a possible hydrogen bonding of solvent water with the H-C bond of the alkyl groups. Then, water clustering around both the alkyl and the amide groups was considered.
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Affiliation(s)
- Mamoru Kano
- Institute of Applied Biochemistry, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan
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19
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Thermo- and pH-sensitive comb-type grafted poly(N,N-diethylacrylamide-co-acrylic acid) hydrogels with rapid response behaviors. Eur Polym J 2009. [DOI: 10.1016/j.eurpolymj.2009.03.019] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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20
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Liu H, Liu M, Jin S, Chen S. Synthesis and characterization of fast responsive thermo- and pH-sensitive poly[(N,N-diethylacrylamide)-co-(acrylic acid)] hydrogels. POLYM INT 2008. [DOI: 10.1002/pi.2460] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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21
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Tang Y, Ding Y, Zhang G. Role of methyl in the phase transition of poly(N-isopropylmethacrylamide). J Phys Chem B 2008; 112:8447-51. [PMID: 18582006 DOI: 10.1021/jp711581h] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Poly(N-isopropylmethacrylamide) (PiPMA) has one more methyl group at each monomeric unit than poly(N-isopropylacrylamide) (PiPA). By use of laser light scattering (LLS) and ultrasensitive differential scanning calorimetry (US-DSC) we have investigated the association and dissociation of PiPMA chains in water. LLS studies reveal that PiPMA chains form larger aggregates at a temperature above its lower critical solution temperature (LCST) as the chain molar mass (Mw) decreases. In comparison with PiPA aggregates, PiPMA aggregates show a larger ratio of average radius of gyration to average hydrodynamic radius (<Rg>/<Rh>), indicating that PiPMA aggregates are looser. US-DSC studies show PiPMA chains have smaller enthalpy change (DeltaH) and entropy change (DeltaS) than PiPA chains during the phase transition, indicating that PiPMA chains have smaller conformational change. Our experiments demonstrate that the additional methyl groups in PiPMA chains restrain the intrachain collapse and interchain association, leading the phase transition to occur at a higher temperature.
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Affiliation(s)
- Yecang Tang
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, China
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22
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Tominaga T, Tirumala VR, Lee S, Lin EK, Gong JP, Wu WL. Thermodynamic Interactions in Double-Network Hydrogels. J Phys Chem B 2008; 112:3903-9. [DOI: 10.1021/jp710284e] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Taiki Tominaga
- Polymers Division, National Institute of Standards and Technology, Gaithersburg Maryland, Graduate School of Sciences, Hokkaido University, Sapporo Japan, and Polymer Science and Engineering, University of Massachusetts, Amherst Massachusetts
| | - Vijay R. Tirumala
- Polymers Division, National Institute of Standards and Technology, Gaithersburg Maryland, Graduate School of Sciences, Hokkaido University, Sapporo Japan, and Polymer Science and Engineering, University of Massachusetts, Amherst Massachusetts
| | - Sanghun Lee
- Polymers Division, National Institute of Standards and Technology, Gaithersburg Maryland, Graduate School of Sciences, Hokkaido University, Sapporo Japan, and Polymer Science and Engineering, University of Massachusetts, Amherst Massachusetts
| | - Eric K. Lin
- Polymers Division, National Institute of Standards and Technology, Gaithersburg Maryland, Graduate School of Sciences, Hokkaido University, Sapporo Japan, and Polymer Science and Engineering, University of Massachusetts, Amherst Massachusetts
| | - Jian Ping Gong
- Polymers Division, National Institute of Standards and Technology, Gaithersburg Maryland, Graduate School of Sciences, Hokkaido University, Sapporo Japan, and Polymer Science and Engineering, University of Massachusetts, Amherst Massachusetts
| | - Wen-li Wu
- Polymers Division, National Institute of Standards and Technology, Gaithersburg Maryland, Graduate School of Sciences, Hokkaido University, Sapporo Japan, and Polymer Science and Engineering, University of Massachusetts, Amherst Massachusetts
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