PP/LCPポリマーブレンドの微細構造と疲労破壊特性に及ぼす応力振幅の影響

概要

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The inner microstructure of blend specimen with the 20% addition of LCP was investigated in this paper, especially in discussion the effect of the stress amplitude on the fatigue fracture property and the effect of LCP addition. The results are following as: (1) PP/LCP blend is an immiscible two-phase material. The diameter of LCP fiber phase would become large from middle layer to core. (2) Companion to add LCP, (a) E' increased and tan δ was low, it showed that the strength increased and the ability of the inner heating itself decreased. (b) The tensile strength increased, but the stretch largely decreased. (c) The microhardness distribution on the specimen surface was improved and the stress concentration on the middle layer would be relaxed. Thus, the fatigue fracture changed to the trend of the brittle damage and the lifetime became long. (3) The severity of the specimen heating itself resulted in the increase in the stress amplitude, the low E' and high tan δ would obviously show. The reinforcement LCP would soften and pulled out from PP matrix. The fracture trend of specimen would change from brittle to ductile.
一般社団法人日本機械学会の論文
2002-02-25