Dimensional stability of polystyrene/polymeric liquid crystal blends
Dimensional stability of polystyrene/polymeric liquid crystal blends
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DOI：
10.1002/pen.760260904
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发表时间：
1986-05
影响因子：
3.2
通讯作者：
A. Apicella;P. Iannelli;L. Nicodemo;L. Nicolais;A. Roviello;A. Sirigu
中科院分区：
文献类型：
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作者：
A. Apicella;P. Iannelli;L. Nicodemo;L. Nicolais;A. Roviello;A. Sirigu
在由挤出和随后的热拉伸获得的聚合物液晶（PLC）-聚苯乙烯（PS）共混片材上进行了高于Tg的恢复实验。所报道的数据表明，通过添加低百分比的在热拉伸过程中取向的不相容的聚合物液晶，可以获得拉伸的热塑性材料的尺寸稳定性的显著改善。所形成的原纤维充当对围绕它们的一定量的聚合物的约束，因此这些高度取向的片材一旦暴露于高温，将主要应力松弛而不蠕变。当达到取向结晶相的熔化温度时，这种效应消失。与未填充基质相比，相容的PLC-PS共混物在尺寸稳定性上没有显示出任何改善。
Recovery experiments above Tg have been performed on polymeric liquid crystal (PLC) - polystyrene (PS) blend sheets obtained from extrusion and subsequent hot drawing. The data reported show that a significant improvement of the dimensional stability of a drawn thermoplastic material can be obtained by adding a low percentage of non-compatible polymeric liquid crystals that are oriented during the hot drawing process. The fibrils formed act as a constraint for a certain amount of polymer surrounding them and consequently these highly oriented sheets, once exposed to high temperature, will mainly stress relax and do not creep. This effect disappears when the melting temperature of the oriented crystalline phase is reached. Compatible PLC-PS blends do not show any improvement on the dimensional stability compared to the unfilled matrix.