Renewable rosin acid-degradable caprolactone block copolymers by atom transfer radical polymerization and ring-opening polymerization

Perry Wilbon, Yijun Zheng, Kejian Yao, Chuanbing Tang

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

Renewable rosin acid-degradable caprolactone block copolymers were prepared by atom transfer radical polymerization (ATRP) and ring-opening polymerization (ROP). Two-step sequential polymerization using either poly(2-acryloyloxyethyl dehydroabietic carboxylate)-OH (PAEDA-OH) or poly(ε-caprolactone)-Br (PCL-Br) as macroinitiators resulted in well-defined block copolymers with low polydispersity. One-pot polymerization was carried out with three different sequential feeds of AEDA and ε-CL monomers. The control of one-pot polymerization depended on the interactions of coexisting ATRP catalysts and ROP catalysts. While the minimal interactions between copper(I) and tin(II) catalysts produced well-defined block copolymers, excess copper(II) or tin(II) led to the formation of block copolymers with polydispersity >1.5. It was suggested that the tin(II) catalysts reduced the persistent radicals copper(II) of ATRP, leading to a poorly controlled polymerization. PCL segments of the block copolymers exhibited excellent degradability under acidic conditions. Thermal behaviors of these block copolymers showed a strong dependence of polymer compositions due to the possible crystallization of the PCL block.

Original languageEnglish (US)
Pages (from-to)8747-8754
Number of pages8
JournalMacromolecules
Volume43
Issue number21
DOIs
StatePublished - Nov 9 2010

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