title: Synthesis of hyperbranched polyethylene amphiphiles by chain walking polymerization in tandem with RAFT polymerization and supramolecular self-assembly vesicles.
abstract: A novel polymerization methodology for efficient synthesis of hyperbranched polyethylene amphiphiles by chain walking polymerization (CWP) followed by RAFT polymerization has been developed. Hyperbranched polyethylene with hydroxyl ends (HBPE-OHs) is first synthesized via chain walking copolymerization of ethylene with 2-hydroxyethyl acrylate with Pd-α-diimine catalyst. The hydroxyl groups of hyperbranched polyethylene are then converted into thiocarbonyl thio moieties by an esterification reaction with trithiocarbonate 3-benzylsulfanylthiocarbonyl sulfanylpropionic acid (BSPA). The hyperbranched polyethylene with thiocarbonyl thio moiety ends (HBPE-BSPAs) is used as a macro-RAFT agent for the synthesis of hyperbranched polyethylene amphiphiles, HBPE-PDMAEMAs, by RAFT polymerization of N,N-dimethylaminoethyl methacrylate (DMAEMA). The resultant HBPE-PDMAEMAs can self-assemble to form supramolecular polymer vesicles in aqueous solution. A preliminary investigation on thermo- and pH-responsive behaviors of the polymer is also reported.
authors.affiliation: School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, China.
authors.forename: Xinbo
authors.initials: X
authors.lastname: Shi
authors.forename: Ye
authors.initials: Y
authors.lastname: Zhao
authors.forename: Haiyang
authors.initials: H
authors.lastname: Gao
authors.forename: Ling
authors.initials: L
authors.lastname: Zhang
authors.forename: Fangming
authors.initials: F
authors.lastname: Zhu
authors.forename: Qing
authors.initials: Q
authors.lastname: Wu
mesh_terms: D060326:Chemistry Techniques, Synthetic / Q000295:instrumentation / Q000379:methods*; D015394:Molecular Structure; D020959:Polyethylene / Q000737:chemistry*; D058105:Polymerization; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D011108:Polymers; D020959:Polyethylene