氙灯加速老化对聚酯纤维/PVC柔性复合材料力学性能影响的研究

聚酯纤维/PVC柔性复合材料由于多用于户外,易受阳光照射而老化,从而影响材料的力学性能。通过模拟大气环境较好的氙灯耐气候试验箱,考察了氙灯加速老化对聚酯纤维/PVC柔性复合材料顶破性能和撕裂性能的影响。采用CRT材料试验机,研究了聚酯纤维/PVC柔性复合材料的顶破性能和撕裂性能的变化,并比较了两种不同撕裂模式的破坏机理;采用FTIR研究了PVC涂层吸收峰和峰强的变化;采用SEM研究老化前后涂层表面的微观形貌。研究表明:氙灯人工气候老化下,聚酯纤维/PVC柔性复合材料的老化机理主要是羰基化合物和共轭双键的形成;柔性复合材料撕裂性能下降明显;不同撕裂模式对评价柔性复合材料差异较大。

THE STUDY OF ACCELERATED AGING OF ARTIFICIAL XENON ARC LAMP ON THE BURSTING AND TEARING PROPERTIES OF POLYESTER FIBER/PVC FLEXIBLE COMPOSITE

Because of outdoor application,polyester fiber/PVC flexible composite materials are tend to age under solar radiation,and the mechanical properties will then be affected.Artificial xenon arc lamp gives a good simulation of outdoor environment,so the influence of accelerated aging by artificial xenon arc lamp on the bursting and tearing properties of polyester fiber/PVC flexible composite were investigated.The bursting and tearing properties of the aged and un-aged composites,as well as the failure mechanism,were investigated by static mechanical tests.The failure mechanism of two different tearing modes were compared.The change of the peak position and intensity were illustrated by FTIR,and the micro-morphology were examined by SEM.It is found out that carbonyl compound and conjugated double bond are mostly formed in the polyester fiber/PVC flexible composite accelerated aging by artificial xenon arc lamp.The tearing property of the flexible composite decreases significantly with aging time.Different tearing modes result in significant difference in tearing force.