| 紫外光辐照对硬质聚氯乙烯结构及性能的影响 |
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| 引用本文： | 田馨,陈晓峰,周昌林,雷景新. 紫外光辐照对硬质聚氯乙烯结构及性能的影响[J]. 中国塑料, 2008, 22(7): 53-57. DOI: 10.19491/j.issn.1001-9278.2008.07.010 |
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| 作者姓名： | 田馨 陈晓峰 周昌林 雷景新 |
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| 作者单位： | 1.四川大学高分子研究所高分子材料工程国家重点实验室，四川成都610065;2.四川理工学院材料与化学工程系，四川自贡643000 |
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| 基金项目： | 国家自然科学基金重点资助项目(50533080) |
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| 摘 要： | 采用衰减全反射傅立叶变换红外光谱、紫外光谱、扫描电镜、凝胶渗透色谱、拉伸应力一应变、黄色指数、与水接触角及失重率等测试研究了紫外光(UV)辐照对硬质聚氯乙烯(PVC)结构及性能的影响。结果表明:随着UV辐照时间的延长，平均相对分子质量增大至最大值后，进一步延长辐照时间平均相对分子质量减小，多分散系数由1.771增加到1.919，相对分子质量分布变宽。分子链中引人了多种揣基官能团和多种共扼多烯结构。试样表面经历了粗糙、裂纹形成及其扩散等形态破坏过程，试样黄色指数由40.7%逐渐增加到90%以上，表面颜色逐渐变深，失重率逐渐增大到0.22%，与水接触角先由63.3迅速下降到55，然后下降程度趋于平缓，逐渐下降到平衡值50UV辐照的初期试样的拉伸强度由未经辐照时的55MPa增加到57MPa，进一步延长辐照时间后拉伸强度降低，而断裂伸长率由未辐照时的35.5%迅速降低到11.8%。
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| 关 键 词： | 聚氯乙烯 紫外光 老化 分子结构 |
| 收稿时间： | 2008-03-22 |
Effect of Ultraviolet Irradiation on Structure and Properties of Unplasticized Poly(vinyl chloride) |
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| TIAN Xin CHEN Xiao-feng ZHOU Chang-lin LEI Jing-xin. Effect of Ultraviolet Irradiation on Structure and Properties of Unplasticized Poly(vinyl chloride)[J]. China Plastics, 2008, 22(7): 53-57. DOI: 10.19491/j.issn.1001-9278.2008.07.010 |
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| Authors: | TIAN Xin CHEN Xiao-feng ZHOU Chang-lin LEI Jing-xin |
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| Affiliation: | 1 .The State Key L.ab. of Polymer Materials Eng. ,Polymer Research Institute of Sichuan University>C;hengdu 610065 China;2. Dept. of Material and Chemical Eng.，Sichuan University of Sci. and Tech.，Zigong 643000 |
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| Abstract: | Effect of ultraviolet light (UV) irradiation on the structure and properties of PVC was studied by means of FT-IR,UV spectrum,SEM,GPC,stress-strain curves,yellow index,and water contact angle tests,etc.With the increasing UV irradiation time,the molecular weight of PVC increased to a maximum then decreased,polydispersity index increased from 1.771 to 1.919.The earbonyl groups and the conjugated double-bond sequences were generated on PVC chains.Surface of PVC samples became coarse,lots of cracks formed and ... |
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| Keywords: | polyvinyl chloride) ultraviolet light aging molecular structure |
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