【摘要】 用ISO4600规定的球压入法研究了七种常用车灯塑料的耐环境应力开裂性能,得出了这些车灯塑料不宜接触的化学介质环境。实验结果表明,塑料环境应力开裂时间与溶剂的溶解度参数有关,并且还与聚合物的结晶性以及聚合物中填充物的加入有密切的关系。更多还原

【Abstract】 The method of ISO 4600 is used to measure the properties to resist environmental stress cracking (ESC) of seven plastics used in automotive lamp in a certain strain. A list of chemical mediums leading to ESC for these plastics was given. The effects of solubility parameters of solvents, crystallinity of polymers and the filling materials in plastics on cracking time of ESC were discussed. The results indicate that the great difference between solubility parameters of solvents and plastics can reduce the ESC tendency of plastics and the crystallinity of polymers and the filling materials in plastics may improve the properties to resist ESC of plastics.更多还原