双轴取向聚氯乙烯管材解取向研究

将双轴取向聚氯乙烯（PVC-O）管段进行加热，使其发生2种不同程度的解取向：完全解取向、轴向解取向。通过对PVC-O成品管段、完全解取向管段、轴向解取向管段、坯管进行低温抗冲试验，另对PVC-O成品管段和轴向解取向管段进行轴向拉伸和径向拉伸试验，分析解取向前后管材的力学性能。结果表明，完全解取向管材的低温抗冲性能和轴向拉伸性能会降低；轴向解取向管材的低温抗冲性能和轴向抗拉性能降低，径向拉伸性能变化不大。

Study on disorientation of biaxially oriented unplasticized poly（vinyl chloride） pipes

Biaxially oriented poly（vinyl chloride） （PVC?O） pipe segments were heated to make them undergo two disorientation at different degrees of complete disorientation and axial disorientation. Low temperature impact tests were carried out on the finished PVC?O pipe segments， fully disoriented pipe segments， axial disoriented pipe segments， and blank pipes. Axial tensile and radial tensile tests were carried out on the finished PVC?O pipe segments and axial disoriented pipe segments to analyze their mechanical properties before and after disorientation. The results indicated that the low temperature impact and axial tensile properties of the fully disoriented pipes decreased. The low temperature impact and axial tensile properties of the axial disorientated pipes also decreased， but their radial tensile properties showed little change.