The investigation on synthesis of periodic polymers with 1, 1-diphenylethylene (DPE) derivatives via living anionic polymerization. (15th April 2019)

• Record Type: Journal Article
• Authors: Zhang, Yiming; Han, Li; Ma, Hongwei; Yang, Lincan; Liu, Pibo; Shen, Heyu; Li, Chao; Li, Yang
• Is Part Of: Polymer. Volume 169(2019)
• Page Start: 95
• Page End: 105
• Publication Date: 2019-04-15
• Subjects: Living anionic polymerization -- Periodic copolymers -- 1, 1-Diphenylethylene derivatives -- Real-time monitoring; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2019.02.033
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: The specific features for the synthesis of periodic polymers with the 1, 1-diphenylethylene (DPE) derivatives were investigated via living anionic copolymerization. Thus, three DPE derivatives, including dimethyl-[4-(1-phenylvinyl)phenyl]silane (DPE-SiH), 1, 1-diphenylethylene (DPE) and 1-propyl-4-(1-phenylvinyl)benzene (DPE-propyl), were selected for living anionic copolymerization with styrene (St) under regulated feed ratios. Real-time in situ 1 H NMR method was applied to monitor the whole chain propagation process to investigate the detail kinetics of the formation of periodic structures and corresponding sequence distribution in chain. Through the real time 1 H NMR monitoring, the special phenomena were observed that kinetic curves of DPE derivatives and St showed almost coincide and the apparent kinetic parameters were nearly equal in broad feed ratios. Meanwhile, the in situ 1 H NMR results indicated that a series of periodic structure, in which the DSDSS or DSS repeating patterns dominantly distributed along the chains, were deduced and the sequence structures are determined by the feed ratios and the reactivity of corresponding DPE derivatives. The glass transition temperatures ( T g s) of the resultant copolymers have been tested to investigate the influence of the repeating patterns on the thermal properties. Graphical abstract: Image 1 Highlights: Periodic polymers with different repeating patterns were obtained with DPE derivatives via living anionic polymerization. Sequence structures in periodic polymers are relate to the monomer feeding ratio and the reactivity of the DPE derivatives. Coincided kinetic behaviors were observed when periodic structures were generated during the copolymerization.