【摘要】 研究了钛白粉和硫化锌2种白色颜料对质量分数为30%的玻璃纤维(GF)增强聚对苯二甲酸丁二酯(PBT)基复合材料力学性能的影响。结果表明,添加质量分数为0.5%钛白粉后,复合材料的拉伸强度、弯曲强度和无缺口冲击强度均明显下降,而添加相同用量的硫化锌后,复合材料的力学性能明显提高。采用差示扫描量热法和扫描电子显微镜分析了产生这种力学性能差异的原因。结果发现,钛白粉会降低复合材料中PBT的结晶速度和结晶度;添加钛白粉的复合材料具有最小的β晶型含量,从而导致复合材料韧性下降;钛白粉不利于复合材料中以GF为核生成的串晶的生长,从而使GF与PBT的界面粘结力变弱,复合材料力学性能下降。而加入硫化锌后的效果与之相反。更多还原

【Abstract】 Effects of two white pigments including titanium dioxide and zinc sulfide on mechanical properties of glass fiber(GF) with mass fraction of 30% reinforced polybutylene terephthalate(PBT) composite were studied.The results show that after adding titanium dioxide with mass fraction of 0.5%,tensile strength,flexural strength and un-notched impact strength of the composite decrease obviously,while adding zinc sulfide with same content,the mechanical properties of the composite increase obviously.The main reasons for difference of the mechanical properties were analyzed by DSC and SEM.The results indicate that titanium dioxide can slow down the crystallization rate of PBT in the composite and decrease the crystallinity,the composite with adding titanium dioxide has minimum content of β crystal form which decreases toughness of the composite,titanium dioxide is against the growth of shish-kebab generating with GF as nucleus in the composite,thus interfacial adhesive force of GF and PBT is weak and mechanical properties are reduced.The effects after adding zinc sulfide are reverse.更多还原