【摘要】 在两种不同等规聚丙烯中(iPP1,iPP2)加入0.1%的β-成核剂,通过测定其23℃、-20℃下的冲击强度,研究β晶聚丙烯的韧性随成型温度的变化规律。高β晶含量的iPP的冲击强度比α-iPP明显提高。随着成型温度上升,高β晶含量的iPP在23℃下的冲击强度降低。而成型温度在80~100℃区间时,-20℃下的冲击强度呈峰值。差示扫描量热仪分析结果表明,随着成型温度的升高,iPP-B样品中β晶的相对含量先上升后下降,在100℃附近出现峰值,与-20℃冲击强度呈正相关性。更多还原

【Abstract】 After adding 0.1% β-nucleating agent,isotactic polypropylene(iPP1,iPP2) were analysed in impact strength at 23℃ and -20℃ in order to study the relationship of ductility with molding temperature of β-PP.β-Modification iPP enhanced more than α-modification iPP in impact strength.With the molding temperature rising,impact strength of β-PP reduced at 23℃,while it had a peak value at-20℃ when molding temperature during 80～100℃.β-PP was analysed by DSC.It showed that the content of β-PP in iPP-B first fell then rose,appearing the peak value around 100℃.So the content of β-PP with impact strength at-20℃ presented the relevance.更多还原