Sequence Determination and Regulation in the Living Anionic Copolymerization of Styrene and 1, 1‐Diphenylethylene (DPE) Derivatives. Issue 12 (17th October 2016)

• Record Type: Journal Article
• Authors: Ma, Hongwei; Han, Li; Li, Yang
• Other Names: Frey Holger guestEditor.; Ishizone Takashi guestEditor.
• Is Part Of: Macromolecular chemistry and physics. Volume 218:Issue 12(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-10-17
• Subjects: living anionic polymerization -- sequence determination -- sequence‐determined -- grafting sequence regulation; Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201600420
• Languages: English
• ISSNs: 1022-1352

Abstract

Abstract : The living anionic copolymerization of styrene (St) and 1, 1‐diphenylethylene (DPE) derivatives were carried out to investigate how the DPE units are distributed along the polymer chain. Based on the combination of timing sample method and exact characterizations, the sequence determination method was established to reveal the sequential distribution of DPE units along the functionalized chains. In the copolymerization of St and DPE‐SiH, when DPE‐SiH was excessively fed, a strictly alternating structure can be prepared. As the feed ratios of S/D increased, a gradient structure was obtained. Additionally, when the substituent structure of the DPE derivatives changed, the sequence structure could be regulated. It has been confirmed in the copolymerization of St and DPE‐SiH/OMe or DPE‐SiH/NMe2, that the electron‐donating group (‐OMe or ‐NMe2 ) was introduced into DPE‐SiH. Then, the preliminary sequence regulation method was found. Meanwhile the sequence‐determined grafting was investigated, and bottlebrush polymers with sequence‐determined branches were successfully synthesized. Abstract : Sequence determination and regulation are investigated during the living anionic copolymerization of styrene and 1, 1‐diphenylethylene (DPE) derivatives. The sequence determination method is established to characterizing the sequence distribution of the DPE units in the chain. Through regulating substituent structures of DPE derivatives, sequence regulation is preliminarily actualized. Sequence‐determined bottlebrush polymers are conveniently synthesized based on the sequence‐determined main chains.