中文摘要：

采用PVT膨胀仪研究了PP／POE共混物的P-V-T属性，利用Tait方程预测其比容和热膨胀系数（α），研究了压力对结晶温度（Tc）的影响．结果表明，Tait状态方程可用来预测部分相容的、半结晶PP／POE共混物的PVT行为．PP结晶前后的比容变化比POE的大得多，随着POE含量的增加，PP／POE共混物结晶前后比容的变化均逐渐减小．PP在熔融状态下的α比固体状态的大，而POE正好相反．PP／POE共混物的α随温度和压力的变化与其组成密切相关．随着压力的增高，PP，POE及其PP／POE共混物的结晶温度均呈线性增高的趋势．

英文摘要：

P-V-T properties of PP/POE blends were measured by PVT dilatometer under different pressure. The specific volume（Vsp）, expansivity coefficient（α） of PP, POE and PP/POE blends were calculated by Tait equation, and the influence of pressure on their crystallization temperature（ T ） were discussed. The resuits show that Tait equation can be used to predict the P-V-T properties of blends with partial compatibility and semi-crystallinity. The variation of Vsp, value of PP during crystallization is bigger than that of POE. With increasing the POE content, the variation of Vsp value of PP/POE blend decreased during its crystallization. In addition, α Of PP in molten state is bigger than that in solid state, whilst α of POE at solid state is bigger than that at molten state. The variation of α of PP/POE blend under different temperature and pressure depends on the composition of the blend. With increasing the pressure, the crystallization temperature values of PP, POE and PP/POE blends increase linearly.