Chemija / Chemistry
 ISSN 0235-7216 ISSN 2424-4538 (online) |
2015 m. Nr. 1 Synthesis of multisegmented polymers by RAFT using linear polytrithiocarbonates
Two types of polytrithiocarbonates were synthesized by step-growth polymerization. Method A was based on SN2 reaction between di(trithiocarbonate) anions and α,α’- dibromidoesters, and method B was based on Huisgen 1,3-dipolar cycloaddition between dialkyne-terminated trithiocarbonate and diazide. These multifunctional chain transfer agents (mCTA) were employed in reversible addition-fragmentation chain transfer polymerization of 2-hydroxyethyl acrylate and styrene giving multisegmented homopolymers and multiblock copolymers multi-(polystyrene-b-poly(4-vinylbenzyl chloride)). mCTA prepared by the method A controls well polymerization of styrene, while mCTA prepared by the method B more suits for polymerization of 2-hydroxyethyl acrylate. Multisegmented polymers and multiblock copolymers were analyzed by size exclusion chromatography with triple detection, 1H nuclear magnetic resonance and differential scanning calorimetry. Dispersity of multisegmented poli(2-hydroxyethyl acrylate) was high, varying from 4 to 7, while dispersity of its hidrolyzed product (one block of poli(2-hydroxyethyl acrylate)) was narrow and equal to 1.2. It was demonstrated that multisegmented and multiblock polymers could be synthesized by the use of RAFT chain transfer agent with multiple trithiocarbonate moieties, and dispersity of the products was dependent on dispersity of the used mCTA.
Keywords: RAFT, polytritiocarbonate, multisegmented polymer, multiblock polymer, styrene, 4-vinylbenzyl chloride, 2-hydroxyethyl acrylate |
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