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Issue 7, 2017
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CO2-Responsive graft copolymers: synthesis and characterization

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Abstract

A facile and versatile approach for preparing CO2-responsive graft copolymers via a grafting-to strategy that combines controlled radical polymerization with post-polymerization modification has been demonstrated. A well-defined poly(N,N-dimethylacrylamide-co-pentafluorophenyl acrylate) (P(DMA-co-PFPA)) was synthesized by reversible addition fragmentation chain transfer (RAFT) polymerization bearing reactive pentafluorophenyl esters as grafting sites on a hydrophilic backbone. Then, amino end-functionalized poly(2-(diethylamino)ethyl methacrylate) (PDEAEMA) known for its CO2 responsiveness and hydrophobic poly(methyl methacrylate) (PMMA) were prepared via atom transfer radical polymerization (ATRP) as side blocks, respectively. Subsequently, post-polymerization modification via active-ester amine chemistry, resulted in CO2-responsive graft copolymers with either homo-side chains or discrete multi-functional hetero side chains. Importantly, this grafting-to strategy utilizing active-ester amine chemistry appeared to be a facile and efficient method to fabricate graft copolymers. Interestingly, both prepared CO2-responsive graft copolymers – due to their amphiphilic nature – could self-assemble into vesicles in aqueous solution and displayed CO2-responsive expansion owing to the protonation of tertiary amine groups of PDEAEMA side chains under CO2 stimulation.

Graphical abstract: CO2-Responsive graft copolymers: synthesis and characterization

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Supplementary files

Article information


Submitted
15 Nov 2016
Accepted
02 Jan 2017
First published
03 Jan 2017

Polym. Chem., 2017,8, 1206-1216
Article type
Paper

CO2-Responsive graft copolymers: synthesis and characterization

S. Lin, A. Das and P. Theato, Polym. Chem., 2017, 8, 1206
DOI: 10.1039/C6PY01996J

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