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Indexed by:期刊论文

Date of Publication:2013-08-12

Journal:MACROMOLECULAR CHEMISTRY AND PHYSICS

Included Journals:SCIE、EI、Scopus

Volume:214

Issue:15

Page Number:1677-1687

ISSN No.:1022-1352

Key Words:amphiphiles; amorphous crystalline copolymers; anionic polymerization; graft copolymers; ring-opening polymerization

Abstract:An amphiphilic polymer brush with PB and PEO side chains is prepared by combined "grafting-onto" and "grafting-from". The linear and star-shaped heterografted copolymer synthesized is of controlled molecular weight and has a narrow molecular weight distribution ((M) over bar (w)/(M) over bar (n) < 1.2). A DSC study of this heterografted copoly mer containing crystalline and amorphous chains shows that it displays "fractionated crystallization" behavior. The study on isothermal crystallization kinetics of the copoly mer is carried out in isothermal step crystallization (ISC) experiments, in which two crystallization exothermic peaks at low temperatures are observed. The critical micelle concentration (cmc) of the amphiphilic brush polymer in an aqueous solution is determined by a fluorescence technique. The results show that this amphiphilic brush forms aggregates in the system.