Thermally-labile segmented hyperbranched copolymers: using reversible-covalent chemistry to investigate the mechanism of self-condensing vinyl copolymerization
作者： Hao Sun , Christopher P. Kabb , Brent S. Sumerlin
DOI: 10.1039/C4SC02290D
关键词: Methacrylate 、 Atom-transfer radical-polymerization 、 Polymerization 、 Methyl methacrylate 、 Polymer 、 Maleimide 、 Branching (polymer chemistry) 、 Polymer chemistry 、 Copolymer 、 Chemistry
摘要: A thermally-reversible inimer was used to confirm the controlled growth of individual branches during self-condensing vinyl atom transfer radical polymerization (ATRP). Segmented hyperbranched polymers were synthesized by ATRP methyl methacrylate (MMA) and a novel that contained thermally labile Diels–Alder linkage between its initiating polymerizable moieties. Three distinct feed ratios MMA (15 : 1, 30 : 1, 60 : 1) yielded with variable degrees branching molecular weights in range 120 000 515 000 g mol−1. The resulting branch points cleaved quantitatively on heating yield linear similar theoretical values would be expected based chain (SCVP). pendant furan terminal maleimide functionalities allowed reassembly at 50 °C form “healed” polymers. healing efficiency determined 1H NMR spectroscopy, repaired characterized gel permeation chromatography. segmented polymer employed as multifunctional macroinitiator prepare an amphiphilic “hyper-star” via extension poly(ethylene glycol) ether methacrylate. Assembly these “hyper-stars” into well-defined micelles (∼23 nm) neutral water confirmed transmission electron microscopy dynamic light scattering.
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