摘要
考察了稀土镧系单核金属化合物(HPALa)β晶成核剂对等规聚丙烯(iPP)成核效应的影响。广角X射线衍射表征结果显示,HPALaβ晶成核剂能诱导iPP从α晶型转变成β晶型;成核iPP中β晶型iPP的含量取决于结晶过程中的冷却速率和等温结晶过程中的结晶温度,当HPALa添加量(W(HPALa),占iPP的质量分数)为0.20%时适宜的结晶温度为135℃,当W(HPALa)=0.05%时适宜的冷却速率为20~40℃/min。HPALa卢晶成核剂可同时改善iPP的刚性和韧性,当W(HPALa)=0.50%时,成核iPP在室温(25℃)下冷却结晶,与空白iPP相比,常温(23℃)抗冲强度提高了220%,弯曲模量提高了15%,拉伸强度提高了3%;当W(HPALa)增至1.0%时,成核iPP的力学性能基本保持不变。
Efficiency of a novel rare earth lanthanide mono-metal compound (HPALa) as β nucleating agent in isotactic polypropylene (iPP) crystallization was investigated. Crystallization temperature and cooling rate exerted substantial effects on content of iPP t-form crystals. When addition amount of HPALa ( based on iPP mass ) is 0.20%, the optimum crystallization temperature of inducing transformation of a-from crystals to β-form is 135 ℃ and when addition amount is 0.05% the optimum cooling rate is 20 -40 ℃/min. The addition of HPALa as nucleating agent enhances the mechanical properties of iPP evidently. For example, when amount of addition is 0.50% in comparing with the blank impact strength of iPP can be raised by 220% (23 ℃ ), flexural modulus by 15%, and tensile strength by 3 %. Mechanical properties of nucleated iPP trend to maintain nearly constant after addition amount of HPALa increases to 1.0%.
出处
《石油化工》
CAS
CSCD
北大核心
2009年第6期662-667,共6页
Petrochemical Technology
基金
国家自然科学基金资助项目(20876042)