クリープ延伸過程および等速延伸過程におけるガラス状ポリメタクリル酸メチルの動的粘弾性変化(<特集>高分子材料)

概要

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The complex shear modulus, G^*=G′+iG″, of galssy poly (methyl methacrylate)(PMMA)has been measured during creep elongation and constant speed elongation where plastic flow is observed.In creep experiments, the stress level is chosen so that it agrees with that of the steady plastic flow observed by constant speed experiments.In the state of steady plastic flow, value of G^* obtained by the creep elongation and the constant speed elongation agrees with each other.This agreement leads to the conclusion that molecular structures developed in steadily flowing glass do not depend on the deformation history.At the lowest strain rate or the lowest creep stress, G′ gradually increases with elongation and exceeded the value for underformed sample.This result shows that the polymer glass can be hardened during post-yield plastic flow.
社団法人日本材料学会の論文
2000-12-15