摘要
等规聚丙烯(i PP)是目前世界上用量最大的通用塑料之一,提高其综合力学性能具有重要意义。根据i PP的同质多晶和对加工环境的敏感特性,调控i PP形成β晶型,以及诸如串晶等各向异性的晶体形态,是实现i PP自增韧和自增强的重要途径。近年来,关于i PPβ晶型的获得和晶体形态的可控设计已有诸多研究,其调控方法主要是对加工应力场、温度场和异相成核物质的设计。在逐渐增强的应力场和温度场作用下,i PP的晶体结构将从α球晶富集向β晶富集再向高度有序α串晶富集的方向进行转变。最新的研究成果表明,通过在流动场中添加纤维状β成核剂,可实现有序β型片晶的富集。基于此,本文着重从i PPβ晶型和晶体形态调控两个方面,对相关机制和近年的研究情况进行总结和介绍。
Isotactic polypropylene（ i PP） is one of the general plastics in the world. Improving the comprehensive mechanical properties of i PP is of great importance. On the basis of understanding the polymorph phenomenon and the structural sensitivity to processing conditions of i PP,it is a key way to realize the self-toughening and self-enhancing of i PP via controlling the condensed structure to appear as β-modified crystals and anisotropic crystals like shish kebab. In recent years,lots of research related to the cultivating methods of β-form i PP and the design of i PP crystalline morphology have been carried out,and the approaches applied in this area are mainly about the adjusting of processing stress field,processing temperature field and heterogeneous nucleators. Under the conditions of increasingly strengthened stress and temperature fields,the crystalline structures of i PP incline to transforming from rich α-modified spherulites to rich β-form crystals and to rich α-form shish kebab. Moreover,recent research has verified that the addition of fibrous β nucleating agents,can promote the drastic increment of orderly-stacked β lamellas during flow forming process. Thus,this paper aims to introduce and summarize the recent progress and theories corresponding to the tailoring of β-form crystals and crystalline morphologies of i PP.
作者
韩锐
胡斌
李光照
彭婷
黄俊
HAN Rui1, HU Bin1 , LI Guangzhao1 , PENG Ting1 , HUANG Jun2.(1. School of Materials Science and Engineering, Xihua University, Chengdu 610039 China ; 2. School of Materials and Environmental Protection, Chengdu Textile College, Chengdu 611731 Chin)
出处
《西华大学学报（自然科学版）》
CAS
2018年第3期55-67,共13页
Journal of Xihua University:Natural Science Edition
基金
国家自然科学基金青年基金项目(51703182)
西华大学大学生创新创业训练计划项目(201610623060)
四川省科技厅应用基础研究专项项目(2017JY0137)
关键词
等规聚丙烯
Β晶
晶体形态
调控
研究进展
isotactic polypropylene
β - form crystal
crystalline morphology
design
research progress
