Immortal Ring-Opening Polymerization of rac-Lactide Using Polymeric Alcohol as Initiator to Prepare Graft CopolymerReportar como inadecuado




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1

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

2

University of the Chinese Academy of Sciences, Changchun Branch, Changchun 130022, China





*

Author to whom correspondence should be addressed.



Academic Editor: Changle Chen

Abstract In the presence of a small molecular protic initiator, immortal ring-opening polymerization ROP of lactide LA is a highly efficient strategy to synthesize polylactide in a controllable manner, while using polymeric alcohol as an initiator has been less investigated. A series of polymeric alcohols PS–OH composed of styrene and 4.3%–18% hydroxyl functional styrene diethylhydroxy4-vinylphenylmethylphosphonate, St–OH were synthesized through reversible addition-fragmentation transfer RAFT polymerization. Using PS–OH as an initiator, the immortal ROP of rac-LA was catalyzed by dibutylmagnesium MgnBu2 under various ratios of monomer to hydroxyl group within PS–OH to generate polystyrene-g-polylactide PS–g–PLA copolymers with different graft lengths. After thermal annealing at 115 °C, the PLA domain aggregated to nanospheres among the PS continuum. The size of the nanospheres, varying from 130.1 to 224.2 nm, was related to the graft density and length of PS–g–PLA. Nanoporous films were afforded through chemical etching of the PLA component. View Full-Text

Keywords: immortal ring-opening polymerization; RAFT polymerization; polymeric alcohol; grafting-from; nanoporous film immortal ring-opening polymerization; RAFT polymerization; polymeric alcohol; grafting-from; nanoporous film





Autor: Na Liu 1,2, Bo Liu 1, Changguang Yao 1,2 and Dongmei Cui 1,*

Fuente: http://mdpi.com/



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