聚氯乙烯膜结构复合材料的光氧老化行为及评价

Photo oxidative aging behavior and evaluation of polyvinyl chloride membrane structural composites

为探究经编和机织涂层膜结构复合材料的光氧老化行为,以涤纶经编和机织聚氯乙烯(PVC)涂层膜结构复合材料为对象,选取6种织物试样,研究其在紫外光辐射下的老化现象,同时与涤纶纱线力学性能的老化效应进行对比;同时研究了老化实验过程中复合材料的光氧老化行为及力学性能变化,并分析了其微观损伤机制。结果表明:涂层膜对基布纱线起到了很好的保护作用;经编织物膜结构材料老化后的初始模量均高于机织物膜结构材料,断裂强力保持率则反之;在辐射能为82.08×10^(3) kJ/m^(2)时,织物的横密和纵密均为24根/(5 cm)的单面经编膜结构复合材料断裂强力保持率仅为62.4%,且其涂层对基布的保护作用已失效,涂层膜表面严重粉化和黏结;另外5种双面膜结构试样断裂强力保持率均在85%以上,在此辐射能范围内涂层面变粗糙,但仅出现少量沟槽,表现出良好的抗光氧老化性能。

In order to investigate the different photo-oxygen aging behavior of membrane coated warp knitted and woven structure composites,accelerated aging behavior of polyester warp knitted and woven fabric reinforced polyvinyl chloride(PVC)membrane composites was studied under ultraviolet irradiation.Six types of fabrics were selected for making the composites,and the aging was characterized by the mechanical properties of polyester yarn.The test results show that the coating membrane has a good protective effect on the yarns in the fabrics.The initial modulus of warp knitted fabric is higher than that of woven fabric,but the retention rate of breaking strength is lower.At the irradiation energy of 82.08×10^(3) kJ/m^(2),the fracture strength retention rate of the single-face warp-knitted membrane structural composite with both 24 course and wale densities is only 62.4%,and the coating of the single-face membrane structural material is no longer effective in protecting the substrate fabric with the coating membrane granulized and clustered.However,the retention rates of breaking strength of the five double-faced samples are all above 85%.Within the irradiation energy range,the coated surface becomes rough,with few grooves appearing,demonstrating good anti-photo oxygen aging performance.