聚酰胺非晶相弹性性质预测

The Predictions of Elastic Properties of Amorphous Phase of Polyamides

聚合物基复合材料宏观有效力学性质的确定需要复合材料中各个组分的基本力学性质。采用基于拓扑的关联指数法对11种典型聚酰胺非结晶相的体积模量、泊松比、杨氏模量、剪切模量等弹性性能进行了预测。结果表明,当温度从1K逐步增加到(Tg-20)K时,体积模量、杨氏模量和剪切模量随温度的增加呈指数规律减小;而泊松比则呈线性增加。当温度在玻璃化温度Tg附近(Tg-20)<T<(Tg+30)时,杨氏模量和剪切模量的大小急剧地从GPa量级减小到MPa量级;泊松比从大约0.42快速地增加到0.4999。体积模量在玻璃化温度Tg附近有一个明显的降低后,随温度的升高再次保持指数规律降低的趋势。在玻璃化温度以下对预测数据进行回归分析,获得了这些弹性性能与温度的相关关系。

The basic elastic properties of the components of polymer matrix composites are required for the prediction of effective property.The elastic properties of 11 polyamides,such as Poisson′s ratio,bulk modulus,Young′s modulus and shear modulus,were predicted by the connectivity indices method based on topology from their molecular structures.It shows that when the temperature rises from 1 K to（Tg-20）K,bulk modulus,Young′s modulus and shear modulus decrease exponentially,while the Poisson′s ratio increases linearly.And with the temperature rising from（Tg-20） K to（Tg＋30） K,Young′s modulus and shear modulus decrease from GPa order magnitude to MPa order magnitude dramatically,while the Poisson′s ratio increases from about 0.42 to 0.4999 rapidly.After a drop of bulk modulus at the glass transition temperature,it decreases exponentially again with temperature increasing.The correlations between these elastic properties and temperature of 11 kinds of polyamides were obtained by linear or nonlinear regression respectively.