中文摘要：

基于直接加压法原理（Piston—cylinder），研制了1种聚合物PVT（温度一比容积一温度）特性测试仪。该试仪测试压力范围为0．5～100MPa，测试温度范围为30～300℃，最大冷却速率为45℃／s。通过对聚丙烯（PP）PVT特性测试表明：测试仪在较低的冷却速率下的重复精度为0．138％；对实验测试结果进行拟合，获得修正的双域Tait状态方程参数。同时，利用该装置研究了冷却速率对于聚合物PVT特性的影响。

英文摘要：

Based on the Piston-cylinder technique, a polymer PVT property device was designed and manufactured as a function of pressure （0.5MPa to IOOMPa） ,temperature （30 ℃ to 300℃ ） , cooling rate （up to 45 ℃/s）. The results of the PVT testing with polypropylene（PP） showed that repeatability of the device was 0. 138 % under a low cooling rate. The PVT property was correlated by a modified two-domain Tait equation. The parameters for the equation were obtained. The influence of cooling rate on the PVT property was researched with the device.