New azo-chromophore-containing multiblock poly(butadiene)s synthesized by the combination of ring-opening metathesis polymerization and click chemistry

• Published in: Polymer (Guilford) Vol. 51; no. 6; pp. 1285 - 1292
• Main Authors: Ding, Liang, Zhang, Liya, Yang, Dan, Huang, Wei, Xie, Meiran, Zhang, Yiqun
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 11.03.2010; Elsevier
• Subjects: Applied sciences; Click chemistry; Exact sciences and technology; Multiblock copolymers; Organic polymers; Physicochemistry of polymers; Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts; Ring-opening metathesis polymerization (ROMP); Ring-opening metathesis polymerization (ROMP); Click chemistry; Multiblock copolymers; Ring opening polymerization; 1,3-Dipolar cycloaddition; Triazole derivative copolymer; Telechelic polymer; ROMP; Propargylic compound; Cis trans isomerization; Complex catalyst polymerization; Azo compound; Chain transfer; Cyclodiene copolymer; Domain structure; Azo polymer; Bromine Organic compounds; Photoisomerization; Ring-opening metathesis polymerization; Surface topography; Experimental study; Organic solution; Cyclodiene polymer; Ester copolymer; Cyclopolymer; Metathesis polymerization; Multiblock copolymer; Preparation; Light sensitive copolymer; Kinetics
• ISSN: 0032-3861; 1873-2291
• DOI: 10.1016/j.polymer.2010.02.001

A combination of ring-opening metathesis polymerization (ROMP) and click chemistry approach was utilized for the first time in preparation of multiblock copolymers. The dibromo-functionalized telechelic poly(butadiene) (PBD) was synthesized firstly by ROMP of 1,5-cyclooctadiene in the presence of a symmetrical difunctional chain transfer agent and transformed into diazido-telechelic PBD, which was then reacted with a dialkynyl-containing azobenzene chromophore via click reaction, producing novel multiblock PBDs collected by azobenzene groups and newly formed triazole moieties. The monomer and polymer were characterized by IR, UV–vis, LC/MS, and NMR techniques. The produced multiblock copolymers have molecular weights within 13.3 and 57.8 kDa, and their polydispersity indices ranging from 1.98 to 2.38 by gel permeation chromatography measurement. The multiblock PBDs containing azo chromophores and triazole moieties with or without hydrogen-bonding interreaction with 4,4′-dihydroxybiphenyl molecule exhibited different photoisomerization efficiency from trans to cis as observation in UV–vis spectroscopy. The morphologies of multiblock PBDs were also investigated by atom force microscopy. [Display omitted]