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中文摘要：
采用力学性能测试、扫描电镜（SEM）、红外光谱（FT-IR）等方法研究了增塑剂邻苯二甲酸二辛酯（DOP）对聚氯乙烯（PVC）紫外光老化性能的影响。结果表明：随着紫外光照射时间的延长，试样表面颜色逐渐变深并产生裂纹，硬质PVC试样的断裂伸长率显著减小，拉伸强度变化不大；而软质PVC试样的断裂伸长率和拉伸强度均降低；在老化过程中，出现了C—Cl键的断裂、羰基的形成及其红外吸收峰的逐步增大等过程。
英文摘要：
The effect of plasticizer DOP on the ultraviolet light （UV） ageing properties of PVC was studied by means of mechanical properties test, SEM and FT-IR. The results showed with the increase of irradiation time, the color of sample surface turned to da. k gradually, and cracks appeared on the surface of the sample. The elongation at break of rigid PVC sample decreased remarkably, and tensile strength changes little, while both of the elongation at break and tensile strength of soften PVC sample decreased. During the UV irradiation, some of the C-C1 bonds in PVC molecules broke, the absorption peak of carbonyl groups in the FT-IR spectra of PVC samples appeared, and the IR absorption peak widened gradually.
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