聚丙烯长丝光氧老化性能测试及表征.docVIP

 聚丙烯长丝光氧老化性能测试及表征# 杨旭东1,2，闫永生1* （1. 东华大学纺织学院，上海 201620； 5 10 15 20 25 30 35 2. 东华大学产业用纺织品教育部工程研究中心，上海 201620） 摘要：以聚丙烯长丝为对象，采取人工加速老化和大气自然老化试验，对不同老化过程中聚 丙烯长丝试样的断裂强力、特性粘度（粘均分子量）、熔点和结晶度进行了测定。结果表明， 在两种老化条件下，聚丙烯长丝的熔点随着老化时间的增加而降低，其下降趋势与断裂强力 相一致，但比较缓慢，难以准确反映聚丙烯长丝断裂强力的变化趋势。在老化条件下，试样 的结晶度虽然产生波动，但是与断裂强力变化规律不符，也不能用其来反映宏观性能的变化。 而不论在人工加速老化还是在大气自然老化试验条件下，在聚丙烯长丝的光氧老化过程中， 其断裂强力和特性粘度之间都存在着线性相关，并且这种关系不受紫外辐射条件的影响。这 表明，特性粘度能够准确表征光氧老化过程中聚丙烯长丝断裂强力的变化。 关键词：纺织材料；聚丙烯长丝；光氧老化；断裂强力；特性粘度；熔点和结晶度 中图分类号：TS 102.52 Characterization of Properties of PP Filaments during Photo-oxidation YANG Xudong1,2, YAN Yongsheng1 (1. College of Textiles, Donghua University, ShangHai 201620; 2. Engineering Research Center of Technical Textiles, Ministry of Education, Donghua University, ShangHai 201620) Abstract: Both accelerated weathering tests (with fluorescent lamps) and outdoor weathering tests were then conducted to study the relationship between the macro-property and micro-structure of PP filaments. Tensile strength, intrinsic viscosity (viscosity average molecular weight), melting point and degree of crystallization of the filaments under both weathering conditions were then measured. Results show that, under both weathering conditions, the reduction of melting point and the degree of crystallization of PP filaments are not consistent with the reduction of tensile strength of the corresponding samples. However, a linear correlation can be developed between the reduction of tensile strength and the reduction of intrinsic viscosity of the filaments samples under both weathering conditions. It shows that, during photo-oxidation of PP filaments, the reduction of tensile strength can be characterized by the reduction of intrinsic viscosity of the corresponding samples Keywords: Textile material; Polypropylene filaments; Photo-oxidation; Tensile strength; Intrinsic viscosity; Melting point and degree of crystallization 0 引言 聚丙烯土工织物在建筑、交通、水利等领域的应用非常广泛，但其耐光氧老化性能非常 差 [1~3] 40 的研究也主要针对宏观性能的变化。而宏观性能的降低是其微观结构的