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Synthesis of Thermo-Responsive Polymers with Both Tunable UCST and LCST

Author: TianHaiYing
Tutor: YouYeZi
School: University of Science and Technology of China
Course: Polymer Chemistry and Physics
Keywords: Heat -responsive polymer Low critical solution temperature Reversible addition fragmentation chain transfer Quaternization
CLC: O631.3
Type: Master's thesis
Year: 2011
Downloads: 161
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Abstract


Currently, thermal responsive polymer is a polymer science a hot research topic. By reversible addition fragmentation chain transfer (RAFT) living radical polymerization, can be conveniently prepared by a series of thermal response controllable structure polymer. Since the thermal response of the hydrophilic polymer and amphoteric polymers are biocompatible, they are in the biomedical field have potential application value. This thesis is based on the work of predecessors, in a double adjustable thermal responsive polymer synthesis carried out some exploration, the specific work is as follows: 1. Poly 2 - (2 - methoxyethoxy) ethyl acrylate-co-polyethylene glycol methacrylate [poly (OEGMA-co-MEO 2 MA)] The synthesis and lower critical solution temperature (LCST) of the regulation. RAFT polymerization process using a low critical solution temperature (LCST) and structural response controllable random copolymer poly (OEGMA-co-MEO 2 MA). The two comonomers by changing the molar ratio of the feed to achieve regulation of the LCST random block copolymer. By nuclear magnetic resonance (NMR), gel permeation chromatography (GPC) to characterize the structure and the relative molecular weight and molecular weight distribution; using variable temperature UV-visible spectroscopy of the random block copolymers of lower critical solution temperature responsiveness, as glycol methacrylate monomer (OEGMA) feed molar ratio, the lower critical solution temperature of the polymer (LCST) rises, and the LCST of the polymer and monomer glycol methacrylate (OEGMA) feed molar ratio showed a certain correlation between. 2 Poly dimethylaminopropyl methacrylamide-b-[poly 2 - (2 - methoxyethoxy) ethyl methacrylate-co-polyethylene glycol methacrylate] [poly (OEGMA-co-MEO 2 MA)-b-poly (DMAPMA)] Synthesis and quaternized. Using macromolecular chain transfer agent (macro-CTA) with 2 - (2 - methoxyethoxy) ethyl methacrylate-co-polyethylene glycol methacrylate [poly (OEGMA-co-MEO < sub> 2 MA)] further RAFT polymerization, block copolymers poly successfully synthesized dimethylaminopropyl methacrylamide-b-[poly 2 - (2 - methoxyethoxy) ethyl methacrylate-co-polyethylene glycol methacrylate] [poly (OEGMA-co-MEO 2 MA)-b-poly (DMAPMA)]. Also nuclear magnetic resonance (NMR) and gel permeation chromatography relative to characterize their structure and molecular weight and molecular weight distribution. As the block polymer containing tertiary structure, using 1,3 - propyl sulfonic acid and its lactone quaternized reaction product comprising positive and negative within the zwitterionic salt structure. The structure of the molecule in aqueous solution with the electrostatic attractive, resulting in a polymer solution having a high critical solution temperature (UCST) responsiveness. Variable temperature by UV-visible spectroscopy and dynamic light scattering of the block polymer is a high critical solution temperature, with the degree of quaternization (DQ) increases, the high critical solution temperature (UCST) increased. In the range of low critical solution temperature, the solution was dissolved in a transparent state, particle size less than 10 nm; when the temperature is outside the range of low critical solution temperature, the solution was turbid, particle size of about 100 nm.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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