Dual Switching in Both RAFT and ROP for Generation of Asymmetric A2A1B1B2 Type Tetrablock Quaterpolymers

• DOI: 10.1021/acs.macromol.7b01784
• Publication Date: 2017-11-29T17:04:39Z
• Authors: He Dong; Yuejia Zhu; Zhenjiang Li; Jiaxi Xu; Jingjing Liu; Songquan Xu; Haixin Wang; Yu Gao; Kai Guo
• Keywords: 01 natural sciences; 0104 chemical sciences

In reversible addition–fragmentation chain transfer (RAFT) polymerization, monomers are divided into "more-activated" (type-A1 monomer) and "less-activated" (type-A2 monomer). ring-opening polymerization (ROP), considered to fall electrophilically polymerizable (lactones carbonates, type-B1 nucleophilically (lactides type-B2 Developing a strategy copolymerize the four kinds of for formation asymmetric A2A1B1B2 type tetrablock quaterpolymers by one-pot sequential ROP RAFT is challenge. Herein, we designed synthesized molecule, 2-hydroxyethyl 2-(methyl(pyridin-4-yl)carbamothioylthio)propanoate, which functioned as trifunctional initiator, initiate ROPs modulate polymerizations sequentially in one-pot. We proposed dual "acid/base switch" both generation quaterpolymers. A series di-, tri-, copolymers were showed predicted molar mass narrow dispersities, manifesting that proceeded independently controlled manners. The paved new avenue combine synthesis with advanced functionalities architectures.