Metathesis-driven scrambling reactions between polybutadiene or naturally occurring polyisoprene and olefin-containing polyurethane. (5th November 2015)

• Record Type: Journal Article
• Authors: Ohishi, Tomoyuki; Suyama, Kaori; Kamimura, Shigehisa; Sakada, Masahide; Imato, Keiichi; Kawahara, Seiichi; Takahara, Atsushi; Otsuka, Hideyuki
• Is Part Of: Polymer. Volume 78(2015)
• Page Start: 145
• Page End: 153
• Publication Date: 2015-11-05
• Subjects: Dynamic covalent chemistry -- Olefin metathesis -- Naturally occurring polyisoprene; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2015.09.076
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: Controlled scrambling reactions of polybutadiene and olefin-containing polyurethane prepared by step-growth or chain-growth polymerization were accomplished via macromolecular olefin cross-metathesis in the presence of Grubbs' second-generation catalyst to yield scrambled copolymers with different thermal and mechanical properties. In addition, naturally occurring polyisoprene and olefin-containing polyurethane were successfully scrambled, demonstrating that these polymers can be used to synthesize natural/synthetic hybrid materials by the cross-metathesis reaction. Effects of reaction time, solvent, and homopolymer structure on these scrambling reactions were investigated. This metathesis-based approach facilitates the precise control of the scrambling reactions under the applied reaction conditions, thus affording the desired polymer structures with compositions ranging from multiblock to random compositions and enhanced mechanical properties. Graphical abstract: Highlights: Polybutadiene and olefin-containing polyurethane were scrambled by metathesis. Naturally occurring polyisoprene and the polyurethane were also scrambled. Grubbs' second-generation catalyst was employed for the scrambling reactions. Effects of reaction time, solvent, and polymer structure on scrambling were shown. The mechanical properties of the scrambled polymers were systematically indicated.