中国塑料

中国塑料 ›› 2008, Vol. 22 ›› Issue (07): 53-57 .DOI: 10.19491/j.issn.1001-9278.2008.07.010

• 材料与性能 • 上一篇    下一篇

紫外光辐照对硬质聚氯乙烯结构及性能的影响

田馨，陈晓峰，周昌林，雷景新   

  1. 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
  • 收稿日期:2008-03-22 修回日期:1900-01-01 出版日期:2008-07-26 发布日期:2008-07-26

Effect of Ultraviolet Irradiation on Structure and Properties of Unplasticized Poly ( vinyl chloride)

TIAN Xin，CHEN Xiao-feng，ZHOU Chang-lin，LEI Jing-xin   

  1. 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
  • Received:2008-03-22 Revised:1900-01-01 Online:2008-07-26 Published:2008-07-26
  • Contact: LEI Jing-xin

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%。

关键词: 聚氯乙烯, 紫外光, 老化, 分子结构

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 carbonyl groups and the conjugated double-bond sequences were generated on PVC chains. Surface of PVC samples became coarse, lots of cracks formed and enlarged，yellowness index increased from 40.7%to 90.28%，and the color turned to dark gradually. The weight loss of PVC samples increased to 0. 22%during UV ir-radiation.At initial UV irradiation，the contact angle to water decreased from 63.3to 55 rapidly and then leveled off to about 50 .The tensile strength of PVC samples increased slightly from 55 MPa to a
maximum 57 MPa and then decreased，while the elongation at break decreased from 35.5%to 11.8%with UV irradiation time.

Key words: polyvinyl chloride), ultraviolet light, aging, molecular structure

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