摘要
通过设计不同成分、不同浓度的溶剂浸泡实验对不同种类的聚碳酸酯(PC)标准样条、PC制件及不同模温等情况导致的应力差异和材料本身的耐溶剂性差异进行表征;验证了退火工艺对改善制件内应力的效果;设计实验,对应力与制件力学性能的影响进行了量化测试与分析;并对溶剂作用下部件开裂的机理进行了探讨和分析。结果表明,CCl4腐蚀性强,不适合作为表征PC材料内应力和耐溶剂差异的溶剂,甲苯与正丙醇混合溶剂(TNP)适宜作为表征溶剂;采用聚对苯二甲酸丁二醇酯(PBT)对PC合金化可以有效解决PC材料的耐溶剂开裂性问题;模温差异对应力开裂数量有高于30%的影响;采用110℃、2 h退火工艺可以有效解决制件的应力开裂问题,退火不会造成材料强度明显下降。
The difference of internal stress caused by different types of polycarbonate(PC) test specimens and its parts, different mold temperatures and different solvent resistance were characterized through a series of soaking experiments at different components and solvent concentrations. The effect of annealing process on the improvement of internal stress of the parts was verified, and the effects of stress and mechanical properties of the parts were quantitatively measured and analyzed. Furthermore, the solvent stress cracking mechanism of the parts were analyzed and discussed. The results indicated that CCl4 was not suitable to characterize the difference of stress and solvent resistance of PC due to its high corrosion, and however a mixture of toluene and n-propanol was suitable as a solvent for this characterization. The formation of PC/PBT alloys could effectively improve the resistance to solvent-induced crack of PC. The difference of mold temperature could give a more than 30 % influence on the numbers of stress crack of PC. The stress cracking problem of PC parts could be solved effectively by annealing at 110 ℃ for 2 h, and meanwhile, theirstrength was not reduced significantly.
作者
何洋
李洋洋
邵景昌
樊绍彦
孔德玉
HE Yang;LI Yangyang;SHAO Jingchang;FAN Shaoyan;KONG Deyu(Bulls Group Limited by Share Ltd,Ningbo 315318,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2019年第7期63-68,共6页
China Plastics
关键词
聚碳酸酯
内应力
开裂
溶剂浸泡
polycarbonate
internal stress
crack
solvent soaking
