ポリアミド-6およびセルロースアセテートの機械的特性におよぼす湿度の影響

概要

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The effects of humidity on the mechanical behavior of polyamide-6 (PA) and cellulose-acetate (CA) were investigated. The specimens were exposed in a chamber at constant temperature and humidity for 4〜16 days, and measurements were made on the variations of weight and tensile properties. In addition infrared analysis was conducted using the attenuated total reflectance attachment with a KRS-5 prism. The result are as follows : ( 1 ) In PA, there exists a linear relationship between the weight change and the maximum stress ; i. e. it becomes heavier and more ductile when it is exposed to high humidity and temperature. The main factor of the weight change is moisture absorption and/or desiccation, and this relationship also holds for the specimens under dry-wet cyclic exposure. ( 2 ) The variation of yield stress of CA is correlated well with its weight change but not with the exposed humidity. IR spectroscopy shows that the weight change of CA occurrs by dispersion of plasticizer as well as by absorption of water. Due to dispersion of plasticizer, the variation of the yield stress under dry-wet cyclic exposure is nonreversible.
一般社団法人日本機械学会の論文
1993-02-25