Elastic and sorption characteristics of an epoxy binder in a composite during its moistening
Elastic and sorption characteristics of an epoxy binder in a composite during its moistening
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DOI：
10.1007/s11029-005-0059-z
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发表时间：
2005-07-01
影响因子：
1.7
通讯作者：
Jansons, J.
中科院分区：
文献类型：
--
作者：
Aniskevich, K.;Glaskova, T.;Jansons, J.
本文介绍了一种模型复合材料（CM）--填充LiF晶体的环氧树脂--在润湿过程中的弹性和吸附特性的实验研究结果。通过使用已知的CM的微观力学模型间接地评估具有不同填料含量（v（f）=0，0.05，0.11，0.23，0.28，0.31，0.38和0.46）的CM中的粘合剂的性质。结果表明，对于CM在一个有条件的初始状态下，在它和填料的微观应变（在晶体中的晶面间距的变化，通过X-射线方法测量）作为填料含量的函数的粘合剂的弹性模量具有相同的字符。低填料含量的CM中的粘合剂的弹性模量等于块中的粘合剂的弹性模量; CM中的粘合剂的弹性模量随着填料含量的增加而降低。最大值（对应于CM的水饱和度）强调它？作为填料含量连接点的粘结剂和填料的微应力具有相同的特征。此外，在粘合剂和填料的微观应力的最大应力的绝对值相吻合的高和低含量的填料。在v（f）=0.2-0.3时，填料的微应变超过了粘结剂中的应力。在具有高填料含量的CM中，水分对环氧树脂粘合剂的影响是不完全可逆的：粘合剂的弹性特性增加，扩散率降低，并且在润湿-干燥循环后最终水含量增加。
Results of an experimental investigation into the elastic and sorption characteristics of a model composite material (CM)-epoxy resin filled with LiF crystals-during its moistening are presented. Properties of the binder in the CM with different filler contents (v(f)=0, 0.05, 0.11, 0.23, 0.28, 0.31, 0.38, and 0.46) were evaluated indirectly by using known micromechanical models of CMs. It was revealed that, for the CM in a conditionally initial state, the elastic modulus of the binder in it and the filler microstrain (change in the interplanar distance in the crystals, measured by the X-ray method) as functions of filler content had the same character. The elastic modulus of the binder in the CM with a low filler content was equal to that for the binder in a block; the elastic modulus of the binder in the CM decreased with increasing filler content. The maximum (corresponding to water saturation of the CM) stresses it? the binder and the filler microstresses as junctions of filler content were of the same character. Moreover, the absolute values of maximum stresses in the binder and of filler microstresses coincided for high and low contents of the filler. At v(f)=0.2-0.3, the filler microstrains exceeded the stresses in the binder. The effect of moisture on the epoxy binder in the CM with a high filler content was not entirely reversible: the elastic characteristics of the binder increased, the diffusivity decreased, and the ultimate water content increased after a moistening-drying cycle.