等规聚丙烯与液晶成核剂的共混改性研究  

Blending Modification of Isotactic Polypropylene and Liquid Crystal Nucleating Agents

作　　者：申慧雁 王彦鸿 曹莉[1] 苏志强[1] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029 [2]北京首融汇科技发展有限公司,北京100041

出　　处：《中国塑料》2015年第3期26-32,共7页China Plastics

摘　　要：以单丙烯酸酯液晶单体(RLC)为成核剂,通过共混反应法对等规聚丙烯(iPP)进行改性,制备含β晶型的聚丙烯产品(β-iPP)。首先介绍了β-iPP的制备工艺,然后通过偏光显微镜、广角X射线衍射对纯iPP、iPP/RLC共混物的球晶结构进行了分析;最后通过X射线衍射、差示扫描量热分析等测试方法研究共混物的结晶结构、结晶行为和热性能。结果表明,液晶成核剂RLC能够诱导iPP生成β晶型;制备β-iPP的最佳工艺条件是RLC含量为0.5%(质量分数,下同),结晶温度为110℃;β晶型相比于α晶型处于热力学亚稳态,在升温过程中,会发生β晶向α晶的转变,但较高的升温速率会抑制这一转变。β-form containing polypropylene was prepared using a liquid crystal monoacrylate monomer(RLC) as a nucleating agent.Polarized light microscope was adopted to study the nucleation process,crystallization behavior,and spherulites morphology of the polypropylene.The crystal structure was also investigated by X-ray diffraction and differential scanning calorimeter(DSC).When the mass fraction of RLC was 0.5 wt% and the crystallization temperature was 110 'C.Compared with crform,β-form was thermodynamically metastable and could be affected by the temperature fluctuation.The metalstable β-form could transform into crcrystal form,while a higher heating rate would inhibit this transformation.

关 键 词：等规聚丙烯 Β晶型 液晶成核剂 共混改性 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]