膨胀系数与压缩系数
比容在恒压下由温度而引起的变化，即为膨胀系数。聚合物从高温到低温表现出比容逐渐减少的收缩特性。聚合物比容不仅取决于温度而且取决于压力。 聚合物比容在不同温度下都随压力而变化， 压力增高比容减小而密度加大。这种性质对于用压力来控制制品的质量和尺寸精度有重要意义。
透湿性
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