Fixed crosslink formation and viscoelasticity of polystyrene networks

✍ Scribed by Fumiaki Ishii; Wataru Hirahata; Kazuaki Yokota; Katsuyuki Tuda; Akira Hirao; Toyoji Kakuchi

• Book ID: 101274873
• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 217 KB
• Volume: 37
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(19991201)37:23<3319::aid-polb7>3.0.co;2-s

✦ Synopsis

The crosslinking formation in the 8/92 mol % random copolymer of ethynylstyrene and styrene is clarified quantitatively from the IR spectrum analysis on the basis of the thermally homogeneous reaction of ethynylstyrenes between the chains. The viscoelastic properties of the crosslinked polystyrene, CL-P(ESt/St), are investigated based on the temperature and frequency dependencies of the dynamic Young modulus. The relaxation spectrum of CL-P(ESt/St) drops deeply like the Wedge type with a slope of Ϫ 1 2 in the glass transition region, and became a plateau without a terminal zone in the rubbery elasticity region. The effects of the ethynyl crosslinked junctions for the micro-Brownian motions of the segments in the strand are discussed.