蒙脱土/聚丙烯成核机理的α→β转变  

Transformation from α to β of Nucleation Mechanism of Montmorillinite Filled Isotactic Polypropylene Composites

作　　者：戴欣[1] 章自寿[1] 陈春燕[1] 李美[1] 麦堪成[1] 

机构地区：[1]中山大学化学与化学工程学院材料科学研究所∥教育部聚合物基复合材料及功能材料重点实验室∥广东省高性能树脂基复合材料重点实验室,广东广州510275

出　　处：《中山大学学报（自然科学版）》2015年第2期62-65,共4页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目(51173208;51373202);广东省自然科学重点基金资助项目(S2011020001212);高等学校博士学科点专项科研基金资助项目(20110171120018)

摘　　要：蒙脱土(MMT)填充等规聚丙烯(i PP)仅形成α-晶。该文利用MMT的Ca2+与庚二酸(PA)反应形成庚二酸钙(Ca PA)制备了表面负载β-成核剂的MMT(β-MMT),FTIR和TGA证实了β-MMT表面Ca PA的形成。采用DSC和XRD研究了β-MMT填充i PP纳米复合材料的β-成核作用和β-晶含量,观察到随着MMT/PA质量比减小(即PA用量增加),i PP复合材料的结晶峰温提高,α-晶熔融峰强逐渐减弱,β-晶熔融峰强逐渐增强,最后仅出现β-晶熔融单峰,表明β-成核作用增强。XRD结果表明随着MMT/PA质量比减小,β-晶含量逐步提高,当MMT/PA质量比为100制备的β-MMT填充i PP纳米复合材料全部形成β-晶。以上结果表明,MMT粒子表面负载β-成核剂可实现MMT填充i PP复合材料结晶从α-晶转变为β-晶。Montmorillontie （MMT）filled isotactic polypropylene （iPP）forms α-crystal.In this paper,β-MMT with β-nucleating surface supported by calcium pimelate （CaPA）was prepared through chemical reaction between Ca^2＋and pimelic acid （PA）.The results of FTIR spectroscopy and TGA analysis ofβ-MMT confirmed the formation of CaPA on the surface of MMT.The crystallization temperature,β-nuclea-ting ability and the β-crystal content ofβ-MMT filled iPP composites were investigated by DSC and XRD analyses.It was observed that the crystallization temperature and intensity ofβ-crystal melting peak in-creased with decreasing MMT/PA mass ratio,indicating the enhancedβ-nucleating ability.The XRD re-sults showed that the β-crystal contents ofβ-MMT filled iPP composites increased with decreasing MMT/PA mass ratio.In addition,MMT filled iPP composites with β-crystal of 99% could be obtained by β-MMT prepared with MMT/PA mass ratio of 100.These results indicated that the β-nucleating agent sup-ported on the surface of MMT particles could change fromα-to β-nucleation in the MMT filled iPP com-posites.

关 键 词：蒙脱土 聚丙烯 β-成核作用 

分 类 号：O631[理学—高分子化学]