Diacetylene-containing polymers, 8. Synthesis and characterization of novel high molecular weight diacetylene-containing poly(ester-co-urethanes)

✍ Scribed by Sergei Fomine; Imelda Posada; Takeshi Ogawa

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 413 KB
• Volume: 196
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1995.021961124

✦ Synopsis

Abstract

Novel high molecular weight diacetylene (DA) — containing polymers, poly{[bis(3‐butynyl) 3,5‐diynylene sebacate]‐co‐[bis(3‐butynyl) hexamethylenedicarbamate]}s, were synthesized and characterized. The copolymers were found to be semicrystalline and their degree of crystallinity went through a minimum due to a random composition of the copolymers. The copolymers containing less than 40 mol‐% of bis(3‐butynyl) hexamethylene‐dicarbamate (2) were found to be thermoplastic. The glass transition temperature of the copolymers tends to increase with increasing monomer 2 content. All the copolymers underwent topochemical cross‐polymerization on electron‐beam irradiation or heating in the solid state and the maximum of the visible absorption spectra of the cross‐polymerized copolymers showed a long wavelength shift with increasing monomer 2 content. Upon introduction of 10 mol‐% of the urethane monomer 2 the tensile strength of the copolymer increases from 250 MPa to 280 MPa.