表面処理ゼオライト/ポリカーボネート複合系の動的粘弾性
The Effects of Surface-Treatment for Zeolite Powder in Zeolite/Polycarbonate Composites
日下石進・鈴木喜代志・工藤益男・増子 徹
Nikkeshi, Susumu / Suzuki, Kiyoshi / Kudo, Masuo / Masuko, Toru
The effects of surface treatment using four kinds of coupling agents for clinoptilolite-type zeolite powder have been investigated in zeolite/polycarbonate (PC) composites. The composites were prepared by mixing the surface-treated zeolite powder with PC using a plastometer at 280℃. The number-average molecular weight (Mn) of PC, measured by gel permeation chromatography, decreased from 24300 to 13300 with the addition of untreated zeolite. The magnitude of the storage modulus (E’) and the glass transition temperature (Tg) of the composite evaluated by dynamic viscoelastometry decreased with decreasing molecular weight of PC.
The PC polymer is depolymerized during the mixing process due to the acid catalysis of zeolite. In composites where the zeolite was surface-treated with silane coupling agents with epoxygroups and polyphenol, the Mn of PC only decreased to 20700 and 22100, respectively. The E' and Tg of the composites containing these surface-treated zeolites were larger than those of the neat PC. The coupling agents prevented the acid catalysis of zeolite powder, thus the surface-treatment of zeolites are effective in the reinforcement of composites.
Key words: Composite materials / Zeolite powder / Polycarbonate resin / Dynamic mechanical properties / Activation energy of glass transition