DYNAMIC MECHANICAL-PROPERTIES OF ANISOTROPIC NETWORKS FORMED BY LIQUID-CRYSTALLINE ACRYLATES
DYNAMIC MECHANICAL-PROPERTIES OF ANISOTROPIC NETWORKS FORMED BY LIQUID-CRYSTALLINE ACRYLATES
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DOI：
10.1016/0032-3861(91)90398-3
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发表时间：
1991-01-01
期刊：
影响因子：
4.6
通讯作者：
BROER, DJ
中科院分区：
文献类型：
--
作者：
HIKMET, RAM;BROER, DJ
研究了由丙烯酸酯类液晶光聚合得到的取向聚合物网络的热机械性能。 该网络表现出三个机械损耗峰，分别与整个网络的弛豫、分子中心芳环的弛豫和亚甲基的曲轴运动有关。 拉伸模量和取向网络的强度是各向异性的和高度的温度依赖性。 取向网络也表现出各向异性的热行为，在分子取向的方向上收缩，而随着温度的升高在横向方向上膨胀。 取向网络的各向异性性质已被解释在聚合后形成的分子的分子结构和分组方面。
Thermomechanical properties of oriented polymer networks, which had been obtained by photopolymerization of liquid crystalline acrylates, were investigated. The networks exhibited three mechanical loss peaks which were associated with the relaxation of the whole network, relaxation of the central aromatic unit of the molecules and the crankshaft motion of the methylene groups. Tensile modulus and the strength of the oriented networks were anisotropic and highly temperature dependent. The oriented networks also showed an anisotropic thermal behaviour, contracting in the direction of molecular orientation while expanding in the lateral directions with increasing temperature. The anisotropic properties of the oriented networks have been interpreted in terms of the molecular structure and grouping of the molecules formed after polymerization.