1
|
Zhou J, Wang L, Zha X, Wang H. Synthesis of pH-responsive block copolymer micelles via RAFT polymerization induced self-assembly and its application in emulsifier-free emulsion polymerization. PHOSPHORUS SULFUR 2020. [DOI: 10.1080/10426507.2019.1655419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Jianhua Zhou
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology , Xi’an , China
- National Demonstration Center for Experimental Light Chemistry Engineering Education (Shaanxi University of Science and Technology) , Xi’an , China
| | - Lin Wang
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology , Xi’an , China
- National Demonstration Center for Experimental Light Chemistry Engineering Education (Shaanxi University of Science and Technology) , Xi’an , China
| | - Xianghua Zha
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology , Xi’an , China
| | - Hailong Wang
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology , Xi’an , China
| |
Collapse
|
2
|
Leite DC, Kakorin S, Hertle Y, Hellweg T, da Silveira NP. Smart Starch-Poly( N-isopropylacrylamide) Hybrid Microgels: Synthesis, Structure, and Swelling Behavior. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:10943-10954. [PMID: 30132672 DOI: 10.1021/acs.langmuir.8b00706] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this study, we present hybrid microgels made of starch nanoparticles (SNPs) and poly( N-isopropylacrylamide) [p(NIPAM)]. SNPs were formed through nanoprecipitation. Hybrid microgels were prepared by surfactant-free precipitation polymerization (SFPP) or in the presence of surfactant precipitation polymerization (PP) at different NIPAM/SNP ratios. Dynamic light scattering results of hybrid microgels synthesized by SFPP revealed changes in volume phase transition temperature according to SNP amount, where the increase in the hydrophilic content caused small shifts in the lower critical solution temperature (LCST), reaching nearly 35 °C. Colloidal stability was improved with the SNP content, leading to increased stability because of the hydroxyl groups. Small-angle X-ray scattering indicates a core-shell structure above the LCST, where SNPs chains cover a p(NIPAM) core. Swelling curves experimentally obtained were analyzed using the Flory-Rehner model, where the interaction parameter (χ) has been modeled either by a series expansion of the swelling ratio or by a Hill-like equation for a cooperative thermotropic transition.
Collapse
Affiliation(s)
- Daiani C Leite
- Institute of Chemistry , Universidade Federal do Rio Grande do Sul , Av. Bento Gonçalves 9500 , 91501-970 Porto Alegre , Brazil
| | - Sergej Kakorin
- Faculty of Chemistry , Universität Bielefeld , Universitätstrasse 25 , 33615 Bielefeld , Germany
| | - Yvonne Hertle
- Faculty of Chemistry , Universität Bielefeld , Universitätstrasse 25 , 33615 Bielefeld , Germany
| | - Thomas Hellweg
- Faculty of Chemistry , Universität Bielefeld , Universitätstrasse 25 , 33615 Bielefeld , Germany
| | - Nádya P da Silveira
- Institute of Chemistry , Universidade Federal do Rio Grande do Sul , Av. Bento Gonçalves 9500 , 91501-970 Porto Alegre , Brazil
| |
Collapse
|
3
|
Jäger A, Jäger E, Giacomelli FC, Nallet F, Steinhart M, Putaux JL, Konefał R, Spěváček J, Ulbrich K, Štěpánek P. Structural changes on polymeric nanoparticles induced by hydrophobic drug entrapment. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.10.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
4
|
|
5
|
Song W, Granville AM. Surface Modification of Polydivinylbenzene Microspheres with a Fluorinated Glycopolymer Using Thiol-Halogen Click Chemistry. Methods Mol Biol 2016; 1367:123-35. [PMID: 26537469 DOI: 10.1007/978-1-4939-3130-9_10] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Distillation-precipitation polymerization of divinylbenzene was applied to obtain uniform-sized polymeric microspheres. The microspheres were then modified with polypentafluorostyrene chains utilizing surface-initiated atom transfer radical polymerization techniques. The hydrophobic fluoropolymer-coated microsphere was then converted to a hydrophilic biopolymer by performing thiol-halogen click chemistry between polypentafluorostyrene and 1-thio-β-D-glucose sodium salt. The semi-fluorinated glycopolymer showed good binding ability with Concanavalin A as determined by confocal microscopy and turbidity experiments.
Collapse
Affiliation(s)
- Wentao Song
- Centre for Advanced Macromolecular Design, School of Chemical Engineering, The University of New South Wales, Sydney, NSW, Australia, 2052
| | - Anthony M Granville
- Centre for Advanced Macromolecular Design, School of Chemical Engineering, The University of New South Wales, Sydney, NSW, Australia, 2052.
| |
Collapse
|
6
|
Truong NP, Quinn JF, Dussert MV, Sousa NBT, Whittaker MR, Davis TP. Reproducible Access to Tunable Morphologies via the Self-Assembly of an Amphiphilic Diblock Copolymer in Water. ACS Macro Lett 2015; 4:381-386. [PMID: 35596326 DOI: 10.1021/acsmacrolett.5b00111] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
We report on the preparation of positively charged crew-cut nanoaggregates in water with various nonspherical (i.e., worm, flower, and large compound) and spherical (i.e., vesicle and sphere) morphologies by the self-assembly of a single diblock copolymer in water. Our facile procedure for preparing positively charged nanoparticles, when combined with the techniques for obtaining negatively charged and neutral nanoaggregates already established by Eisenberg et al., provides a versatile toolbox for the reproducible production of uniformly nanostructured particles with control over both morphology and surface chemistry. Such nanoparticles offer opportunities for the fundamental study of nanobio interactions and may open the door to novel drug and gene delivery applications.
Collapse
Affiliation(s)
- Nghia P. Truong
- ARC
Centre of Excellence in Convergent Bio-Nano Science and Technology,
Monash Institute of Pharmaceutical Sciences, Monash University, Parkville,
Melbourne, Victoria 3052, Australia
| | - John F. Quinn
- ARC
Centre of Excellence in Convergent Bio-Nano Science and Technology,
Monash Institute of Pharmaceutical Sciences, Monash University, Parkville,
Melbourne, Victoria 3052, Australia
| | - Marion V. Dussert
- ARC
Centre of Excellence in Convergent Bio-Nano Science and Technology,
Monash Institute of Pharmaceutical Sciences, Monash University, Parkville,
Melbourne, Victoria 3052, Australia
| | - Nikolle B. T. Sousa
- ARC
Centre of Excellence in Convergent Bio-Nano Science and Technology,
Monash Institute of Pharmaceutical Sciences, Monash University, Parkville,
Melbourne, Victoria 3052, Australia
| | - Michael R. Whittaker
- ARC
Centre of Excellence in Convergent Bio-Nano Science and Technology,
Monash Institute of Pharmaceutical Sciences, Monash University, Parkville,
Melbourne, Victoria 3052, Australia
| | - Thomas P. Davis
- ARC
Centre of Excellence in Convergent Bio-Nano Science and Technology,
Monash Institute of Pharmaceutical Sciences, Monash University, Parkville,
Melbourne, Victoria 3052, Australia
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
| |
Collapse
|
7
|
Chen X, Zhou J, Ma J. Synthesis of a cationic fluorinated polyacrylate emulsifier-free emulsion via ab initio RAFT emulsion polymerization and its hydrophobic properties of coating films. RSC Adv 2015. [DOI: 10.1039/c5ra15399a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Cationic fluorinated polyacrylate emulsifier-free emulsion was synthesized by RAFT emulsifier-free emulsion polymerization.
Collapse
Affiliation(s)
- Xin Chen
- College of Resource and Environment
- Shaanxi University of Science and Technology
- Xi'an 710021
- China
| | - Jianhua Zhou
- College of Resource and Environment
- Shaanxi University of Science and Technology
- Xi'an 710021
- China
- Shaanxi Research Institute of Agricultural Products Processing Technology
| | - Jianzhong Ma
- College of Resource and Environment
- Shaanxi University of Science and Technology
- Xi'an 710021
- China
- Shaanxi Research Institute of Agricultural Products Processing Technology
| |
Collapse
|
8
|
Koiry BP, Chakrabarty A, Singha NK. Fluorinated amphiphilic block copolymers via RAFT polymerization and their application as surf-RAFT agent in miniemulsion polymerization. RSC Adv 2015. [DOI: 10.1039/c4ra14151b] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Preparation of an amphiphilic block copolymer (Am-BCP) based on poly(ethylene glycol) methyl ether methacrylate (PEGMA) and heptafluorobutyl acrylate (HFBA) via RAFT polymerization and application of this Am-BCP as surf-RAFT agent for polymerization of styrene.
Collapse
Affiliation(s)
- Bishnu P. Koiry
- Rubber Technology Centre
- Indian Institute of Technology Kharagpur
- Kharagpur-721302
- India
| | - Arindam Chakrabarty
- Rubber Technology Centre
- Indian Institute of Technology Kharagpur
- Kharagpur-721302
- India
| | - Nikhil K. Singha
- Rubber Technology Centre
- Indian Institute of Technology Kharagpur
- Kharagpur-721302
- India
| |
Collapse
|
9
|
Wan S, Zheng Y, Shen J, Yang W, Yin M. "On-off-on" switchable sensor: a fluorescent spiropyran responds to extreme pH conditions and its bioimaging applications. ACS APPLIED MATERIALS & INTERFACES 2014; 6:19515-19519. [PMID: 25394564 DOI: 10.1021/am506641t] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A novel spiropyran that responds to both extreme acid and extreme alkali and has an "on-off-on" switch is reported. Benzoic acid at the indole N-position and carboxyl group at the indole 6-position contribute to the extreme acid response. The ionizations of carboxyl and phenolic hydroxyl groups cause the extreme alkali response. Moreover, the fluorescent imaging in bacterial cells under extreme pH conditions supports the mechanism of pH response.
Collapse
Affiliation(s)
- Shulin Wan
- State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology , Beijing 100029, China
| | | | | | | | | |
Collapse
|
10
|
Brummelhuis NT, Weck M. RAFT polymerization of alternating styrene‐pentafluorostyrene copolymers. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/pola.27148] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Niels ten Brummelhuis
- Molecular Design Institute and Department of ChemistryNew York UniversityNew York New York10003
| | - Marcus Weck
- Molecular Design Institute and Department of ChemistryNew York UniversityNew York New York10003
| |
Collapse
|
11
|
Zhang J, Zou M, Dong J, Li X. Synthesis and self-assembly behaviors of well-defined poly(lauryl methacrylate)-block-poly[N-(2-methacryloylxyethyl)pyrrolidone] copolymers. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-3020-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
12
|
pH-responsive amphiphilic hybrid random-type copolymers of poly(acrylic acid) and poly(acrylate-POSS): synthesis by ATRP and self-assembly in aqueous solution. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-2914-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
13
|
Xue Y, Lu HC, Zhao QL, Huang J, Xu SG, Cao SK, Ma Z. Polymethylene-b-poly(styrene-co-2,3,4,5,6-pentafluoro styrene) copolymers: synthesis and fabrication of their porous films. Polym Chem 2013. [DOI: 10.1039/c2py20478a] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
14
|
Schacher FH, Rupar PA, Manners I. Funktionale Blockcopolymere: nanostrukturierte Materialien mit neuen Anwendungsmöglichkeiten. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201200310] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
|
15
|
Schacher FH, Rupar PA, Manners I. Functional Block Copolymers: Nanostructured Materials with Emerging Applications. Angew Chem Int Ed Engl 2012; 51:7898-921. [DOI: 10.1002/anie.201200310] [Citation(s) in RCA: 564] [Impact Index Per Article: 47.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Indexed: 01/07/2023]
|
16
|
Tian Z, Liu X, Chen C, Allcock HR. Synthesis and Micellar Behavior of Novel Amphiphilic Poly[bis(trifluoroethoxy)phosphazene]-co-poly[(dimethylamino)ethyl methacrylate] Block Copolymers. Macromolecules 2012. [DOI: 10.1021/ma300139z] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhicheng Tian
- Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania
16802, United States
| | - Xiao Liu
- Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania
16802, United States
| | - Chen Chen
- Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania
16802, United States
| | - Harry R. Allcock
- Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania
16802, United States
| |
Collapse
|
17
|
Gregory A, Stenzel MH. Complex polymer architectures via RAFT polymerization: From fundamental process to extending the scope using click chemistry and nature's building blocks. Prog Polym Sci 2012. [DOI: 10.1016/j.progpolymsci.2011.08.004] [Citation(s) in RCA: 377] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
18
|
Ma L, Geng H, Song J, Li J, Chen G, Li Q. Hierarchical self-assembly of polyhedral oligomeric silsesquioxane end-capped stimuli-responsive polymer: from single micelle to complex micelle. J Phys Chem B 2011; 115:10586-91. [PMID: 21830755 DOI: 10.1021/jp203782g] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Responsive polymeric micelles have been widely studied because of their potential use in nanocontainers and nanocarriers. In this study, polyhedral oligomeric silsesquioxane (POSS) end-capped poly[2-(dimethylamino)ethyl methacrylate] (POSS-PDMAEMA), a stimuli-responsive organic-inorganic hybrid polymer, was synthesized via atom transfer radical polymerization (ATRP) using POSS-Br as a macroinitiator. The self-assembly behaviors of POSS-PDMAEMA in aqueous solution were studied by fluorescence probe, transmission electron microscopy (TEM), dynamic light scattering (DLS), high-resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD). The results revealed two self-assembly processes of POSS-PDMAEMA. First they self-assembled into a single micelle with the POSS molecules forming a crystal core and the PDMAEMA chains stretching as a corona. Then the single micelles, as building blocks, were able to reversibly form a hierarchical micelle-on-micelle structure (complex micelle) under external stimuli.
Collapse
Affiliation(s)
- Li Ma
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | | | | | | | | | | |
Collapse
|
19
|
Tan BH, Hussain H, He CB. Tailoring Micelle Formation and Gelation in (PEG−P(MA-POSS)) Amphiphilic Hybrid Block Copolymers. Macromolecules 2011. [DOI: 10.1021/ma102510u] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- B. H. Tan
- Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602
| | - H. Hussain
- Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602
| | - C. B. He
- Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117576, Singapore
| |
Collapse
|
20
|
Junginger M, Bleek K, Kita-Tokarczyk K, Reiche J, Shkilnyy A, Schacher F, Müller AHE, Taubert A. Calcium phosphate growth beneath a polycationic monolayer at the air-water interface: effects of oscillating surface pressure on mineralization. NANOSCALE 2010; 2:2440-2446. [PMID: 20835481 DOI: 10.1039/c0nr00380h] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The self-assembly of the amphiphilic block copolymer poly(butadiene)-block-poly[2-(dimethylamino)ethyl methacrylate] at the air-water interface and the mineralization of the monolayers with calcium phosphate was investigated at different pH values. As expected for polyelectrolytes, the subphase pH strongly affects the monolayer properties. The focus of the current study, however, is on the effect of an oscillating (instead of a static) polymer monolayer on calcium phosphate mineralization. Monitoring of the surface pressure vs. mineralization time shows that the monolayer is quite stable if the mineralization is performed at pH 8. In contrast, the monolayer at pH 5 shows a measurable decrease of the surface pressure already after ca. 2 h of mineralization. Transmission electron microscopy reveals that mineralization at low pH under constant oscillation leads to small particles, which are arranged in circular features and larger entities with holes of ca. 200 nm. The larger features with the holes disappear as the mineralization is continued in favor of the smaller particles. These grow with time and form necklace-like architectures of spherical particles with a uniform diameter. In contrast, mineralization at pH 8 leads to very uniform particle morphologies already after 2 h. The mineralization products consist of a circular feature with a dark dot in the center. The increasing contrast of the precipitates in the electron micrographs with mineralization time indicates an increasing degree of mineralization vs. reaction time. The study therefore shows that mechanical effects on mineralization at interfaces are quite complex.
Collapse
|
21
|
Yi Z, Zhu LP, Xu YY, Li XL, Yu JZ, Zhu BK. F127-based multi-block copolymer additives with poly(N,N-dimethylamino-2-ethyl methacrylate) end chains: The hydrophilicity and stimuli-responsive behavior investigation in polyethersulfone membranes modification. J Memb Sci 2010. [DOI: 10.1016/j.memsci.2010.07.045] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
22
|
Hussain H, Tan BH, Seah GL, Liu Y, He CB, Davis TP. Micelle formation and gelation of (PEG-P(MA-POSS)) amphiphilic block copolymers via associative hydrophobic effects. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:11763-11773. [PMID: 20536258 DOI: 10.1021/la101686q] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A series of well-defined amphiphilic di- and triblock copolymers have been synthesized, using atom transfer radical polymerization, with poly(ethylene glycol) (PEG) and poly(methacrylisobutyl polyhedral oligomeric silsesquioxane) P(MA-POSS) as the hydrophilic and hydrophobic blocks, respectively. The detailed self-assembly behavior of the amphiphilic macromolecules in aqueous media was studied using both static and dynamic light scattering (SLS and DLS) techniques. The evolution of block copolymer micelle formation in THF/water mixture (20/80 v/v) was monitored as the THF evaporated from the solvent mixture. Initially the block copolymer chains existed as unimers in solution, followed by the formation of smaller aggregates (R(h) < 2 nm) after 30 min, eventually growing in size to reach an equilibrium size when all the THF evaporated within 24 h. The micelles formed by the block copolymers were found to be kinetically unstable (not frozen); i.e., they tended to revert to individual copolymer chains on dilution. The hydrodynamic radii, R(h), of the micelles varied with the degree of polymerization (DP) of the hydrophobic P(MA-POSS); for example, for PEG(5K)-b-P(MA-POSS), an increase from R(h) approximately 13.3 +/- 1.1 nm to R(h) approximately 17.5 +/- 1.4 nm was observed with a nominal change in the DP of P(MA-POSS) from 4 to 6. The micelles formed by the triblock copolymers (P(MA-POSS)-b-PEG(10K)-b-P(MA-POSS)) were comparable in size to the diblock copolymer micelles; e.g., R(h) approximately 14.0 +/- 1.3 nm was found for P(MA-POSS)(4)-b-PEG(10K)-b-P(MA-POSS)(4). The micellar structures created by the triblocks in aqueous media were "flowerlike", where the PEG middle block adopted a loop conformation in the micelle corona. In addition to micelles, larger aggregates formed by P(MA-POSS)-b-PEG(10K)-b-P(MA-POSS) were also detected in solution. The larger aggregates may suggest a contribution from some PEG blocks adopting an extended conformation with one end dangling in solution, causing gelation at higher copolymer concentrations via intermicellar interactions. The P(MA-POSS)(4)-b-PEG(10K)-b- P(MA-POSS)(4) formed a gel in water at approximately 8.8 wt % copolymer concentration. No gel formation by diblock copolymers was observed; however, the addition of a small amount of triblock copolymer to an aqueous solution of diblock copolymer results in gel formation. Finally, rheological behavior of the obtained gels was also investigated.
Collapse
Affiliation(s)
- H Hussain
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 3 Research Link, Singapore 117602.
| | | | | | | | | | | |
Collapse
|
23
|
Bao H, Li L, Gan LH, Ping Y, Li J, Ravi P. Thermo- and pH-Responsive Association Behavior of Dual Hydrophilic Graft Chitosan Terpolymer Synthesized via ATRP and Click Chemistry. Macromolecules 2010. [DOI: 10.1021/ma100894p] [Citation(s) in RCA: 118] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hongqian Bao
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
| | - Lin Li
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
| | - Leong Huat Gan
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616
| | - Yuan Ping
- Division of Bioengineering, Faculty of Engineering, National University of Singapore, 7 Engineering Drive 1, Singapore 117574
| | - Jun Li
- Division of Bioengineering, Faculty of Engineering, National University of Singapore, 7 Engineering Drive 1, Singapore 117574
| | - Palaniswamy Ravi
- Innovation Centre, 3M Asia Pacific Pte. Ltd., 100 Woodlands Avenue 7, Singapore 738205
| |
Collapse
|
24
|
Becer CR, Kokado K, Weber C, Can A, Chujo Y, Schubert US. Metal-free synthesis of responsive polymers: Cloud point tuning by controlled “click” reaction. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.23872] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
25
|
Bao H, Hu J, Gan LH, Li L. Stepped association of comb‐like and stimuli‐responsive graft chitosan copolymer synthesized using ATRP and active ester conjugation methods. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23709] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Hongqian Bao
- Division of Manufacturing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Jinhua Hu
- Division of Materials Technology, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Leong Huat Gan
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616, Singapore
| | - Lin Li
- Division of Manufacturing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| |
Collapse
|
26
|
Xu J, Tao L, Liu J, Bulmus V, Davis TP. Synthesis of Functionalized and Biodegradable Hyperbranched Polymers from Novel AB2 Macromonomers Prepared by RAFT Polymerization. Macromolecules 2009. [DOI: 10.1021/ma901290a] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Jiangtao Xu
- Centre for Advanced Macromolecular Design (CAMD), School of Chemical Sciences and Engineering and School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney NSW 2052, Australia
| | - Lei Tao
- Centre for Advanced Macromolecular Design (CAMD), School of Chemical Sciences and Engineering and School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney NSW 2052, Australia
| | - Jingquan Liu
- Centre for Advanced Macromolecular Design (CAMD), School of Chemical Sciences and Engineering and School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney NSW 2052, Australia
| | - Volga Bulmus
- Centre for Advanced Macromolecular Design (CAMD), School of Chemical Sciences and Engineering and School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney NSW 2052, Australia
| | - Thomas P. Davis
- Centre for Advanced Macromolecular Design (CAMD), School of Chemical Sciences and Engineering and School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney NSW 2052, Australia
| |
Collapse
|