首页 | 本学科首页   官方微博 | 高级检索  
     检索      

硬脂酸镧复合物对聚丙烯β晶型的诱导作用
引用本文:冯嘉春,黄志镗,陈鸣才.硬脂酸镧复合物对聚丙烯β晶型的诱导作用[J].高等学校化学学报,2001,22(1):154-156.
作者姓名:冯嘉春  黄志镗  陈鸣才
作者单位:1. 中国科学院化学研究所,中国科学院广州化学研究所,
2. 中国科学院化学研究所,
3. 中国科学院广州化学研究所,
摘    要:F等规聚丙烯(iPP)的分子链均为3螺旋构型,可形成α,β,γ,δ和拟六方态等5种晶体结构,β晶型(六方)的PP具有良好的韧性^1,2],近年来因在增韧及制造电容器粗化膜方面有独特性能而受到重视,但β晶型在热力学上是准稳定,动力上是不利于生成的一种晶型[3],只有利用特殊方式才能获得,如选取合适的熔融、结晶温度及一定的温度梯度^4],剪切取向^5],使用成核剂3,6~12]等,前两种方法不易实施,添加能诱导生成β晶型的特效成核剂是目前获得较高含量β晶型PP的可行途径,目前已知的β成核剂主要有两类,一类是少数具有准平面结构的稠环化合物,如γ晶型喹吖啶酮红染料E3B^6]和三苯二噻^7]等,另一类是元素周期表中少数第IIa 族金属的某些盐类及其二元羧酸的复合物,典型的例子如钙的亚氨酸盐^8],硬脂酸钙/癸脂酸钙/癸二酸体系等^3,9,12].

关 键 词:硬脂酸镧  等规聚丙烯  β晶型  硬脂酸  复合物  诱导作用  晶体结构
文章编号:0251-0790(2001)01-0154-03

Lanthanum Stearate Composite Act as β-Modification Nucleating Agent of Isotatic Polypropylene
FENG Jia-Chun,CHEN Ming-Cai,HUANG Zhi-Tang.Lanthanum Stearate Composite Act as β-Modification Nucleating Agent of Isotatic Polypropylene[J].Chemical Research In Chinese Universities,2001,22(1):154-156.
Authors:FENG Jia-Chun    CHEN Ming-Cai  HUANG Zhi-Tang
Institution:FENG Jia-Chun~1,2,CHEN Ming-Cai~2,HUANG Zhi-Tang~1
Abstract:A composite of 60% of lanthanum stearate and 40% (mass fraction) of stearic acid was prepared and its influence on the crystallization characteristics of isotatic polypropylene (iPP) was investigated.The results showed that we had found a new kind ofβ-crystalline form nucleating agent.The composite might induced rather high proportion of β-modification.The relative content ofβ-phase estimated by WAXD and DSC was 30% and 51.8% in a PP containing 2.5%(mass fraction) of the composite respectively.The isothermal crystallization at 130℃ and melting behavior examined by DSC revealed that the composite accelerated the overall rate of crystallization remarkably.The half crystallization period t1/2 decreased from 11.8 min of pure PP to 7.5 min of PP containing 2.5% of the composite.However,the composite had no obvious influence on crystallization mode and the size of a-crystal unit cell.
Keywords:
本文献已被 CNKI 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号