DOP凝胶特性及其对软质PVC力学性能的影响

Effect of DOP Oleogels on Tensile Strength of Flexible PVC

以硬脂酸锂(Li-SA)为凝胶因子,将邻苯二甲酸二辛酯(DOP)凝胶化后制得DOP凝胶。利用该凝胶与聚氯乙烯(PVC)共混制得软质PVC材料,并与未凝胶化DOP制得的材料进行对比。通过测定Li-SA对DOP的凝胶化能力、凝胶-溶胶转变温度,并采用邵氏硬度计、电子万能试验机和场发射扫描电镜分析软质PVC的硬度、拉伸强度及形貌特征。结果表明,由Li-SA制得的DOP凝胶对软质PVC的硬度无显著影响,而DOP凝胶能够有效提高软质PVC的拉伸强度。

Lithium stearate(Li-SA)was considered as a gelator to gelate dioctyl phthalate(DOP)and applied for the fabrication of flexible polyvinyl chlovide(PVC).Furthermore,plasticized PVC with the same content but non-gelated DOP was compared.The critical gelator concentration and gel-sol transition temperature of DOP oleogels were evaluated.Meanwhile,the hardness,tensile strength and morphology characteristics of the flexible PVC were determined.The results show that the hardness of flexible PVC is little changed.However,compared with non-gelated DOP series,the tensile strength of PVC is significantly enhanced due to the application of DOP oleogels.