Synthesis of bottlebrush polymers with v-shaped side chains. (9th May 2018)

• Record Type: Journal Article
• Authors: Wu, Ying; Tang, Qingquan; Zhang, Minghui; Li, Zi; Zhu, Wen; Liu, Zhengping
• Is Part Of: Polymer. Volume 143(2018)
• Page Start: 190
• Page End: 199
• Publication Date: 2018-05-09
• Subjects: Atom transfer radical polymerization -- Bottlebrush polymer -- Copper(I)-catalyzed alkyne-azide cycloaddition reaction -- Grafting onto -- Reversible addition fragmentation chain transfer polymerization; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2018.02.001
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: Bottlebrush polymers with v-shaped side chains were fabricated via "grafting onto" method by a combination of reversible addition fragmentation chain transfer polymerization (RAFT), atom transfer radical polymerization (ATRP)/ring opening polymerization (ROP), and copper(I)-catalyzed alkyne-azide cycloaddition (CuAAC) reaction. RAFT was used to prepare poly(glycidyl methacrylate) backbones with an azide side group on each repeating unit (PGMA-N3 ). ATRP/ROP was used to synthesize a diversity of v-shaped side chains with an alkynyl group in the middle of polymer chain including poly(methyl methacrylate) ( v (PMMA)2 ), poly(tert-butyl acrylate) ( v (P t BA)2 ), polystyrene ( v (PS)2 ), and poly(ε-caprolactone)- block -polystyrene ( v (PCL- b -PS)). CuAAC reaction was then conducted to graft the alkynyl-functionalized side chains onto azide containing backbones and produce the corresponding bottlebrush polymers with varied v-shaped side chains such as PGMA283 - g - v (P t BA22 )2, PGMA100 - g - v (P t BA22 )2, PGMA100 - g - v (P t BA35 )2, PGMA100 - g - v (PS10 )2, PGMA100 - g - v (PMMA30 )2, and PGMA100 - g - v (PCL10 - b -PS24 ). For all these bottlebrush polymers with varied v-shaped polymer side chains, a high side chain grafting density was obtained with a value above ca. 80% based on the "grafting onto" method developed in this study. Graphical abstract: Image 1 Highlights: A "grafting onto" method was developed for preparing bottlebrush polymers with v-shaped side chains. RAFT and ATRP/ROP were used for preparing azide-functionalized backbones and v-shaped side chains with alkynyl groups. CuAAC was used to densely graft side chains onto backbones.