イソシアヌレート架橋ポリウレタンの粘弾性II : ポリオキシテトラメチレングリコール基剤ポリウレタン

概要

論文の詳細を見る
Isocyanurate crosslinked polyurethanes were prepared from poly (oxytetramethylene glycol). Stress relaxations were measured and compared with those of TMP-cured and MOCA-cured polyurethanes. Ten-second modulus vs. temperature relationships obtained from stress relaxation data revealed that isocyanurate crosslinked polyurethanes showed fairly broad glass transition region and had more gentle slope than TMP-cured and MOCA-cured ones. In rubbery region, moduli of isocyanurate crosslinked polyurethanes were several times higher than those of TMP-cured ones and as high as those of MOCA-cured ones that have strong hydrogen bonding ability. Stress relaxation curves were superimposed successfully and master curves were obtained. Temperature dependence of log a_T deviated from the WLF equation at high temperatures and followed the Arrhenius equation. The relaxation spectra of isocyanurate crosslinked polyurethanes showed remarkably gentle slope in transition region as in the case of MOCA-cured ones. TMP-cured polyurethanes, in contrast, behaved as typical amorphous polymer networks. This difference is considered to be ascribable to the different degrees of the aggregations of polymeric chains.
近畿大学の論文
1974-12-01