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两种尺度增强结构的聚丙烯形态与性能研究

发表时间:2011-05-15  浏览量:1204  下载量:596
全部作者: 陈妍慧,杨皓然,张正驰,唐建华,李忠明
作者单位: 四川大学高分子科学与工程学院,高分子材料工程国家重点实验室;四川大学化学工程学院
摘 要: 通过振动剪切注塑(oscillotory shear injection molding, OSIM)技术制备了2种尺度结构增强的等规聚丙烯(isotactic polypropylene, iPP)复合材料,即纳米尺度分子取向结构(shish-kebab结构)和微米尺度玻璃纤维(glass fiber, GF)。小角X-射线散射(small angle X-ray scattering, SAXS)的结果表明:振动剪切与GF网络的共同作用使OSIM试样中shish-kebab结构的含量得到增加。与添加了GF的普通注塑(conventional injection molding, CIM)试样相比,2种尺度结构增强OSIM试样的拉伸强度和冲击强度均得到了增强。然而,OSIM iPP/GF复合材料的拉伸强度和冲击强度与OSIM iPP试样相当。这是由于部分自增强的shish-kebab结构被取代,同时GF与基体界面结合较弱所造成的。
关 键 词: 材料加工工程;玻璃纤维;力学性能;shish-kebab结构;注塑成型
Title: Structure and properties of isotactic polypropylene with two-scale reinforcements
Author: CHEN Yanhui, YANG Haoran, ZHANG Zhengchi, TANG Jianhua, LI Zhongming
Organization: College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University; School of Chemical Engineering, Sichuan University
Abstract: The isotactic polypropylene (iPP) composite with two-scale reinforcement structure, i.e., nano-scale molecular orientation structure (shish-kebab structure) and micron-scale glass fiber (GF), was fabricated by an oscillatory shear injection molding (OSIM) technology. The results of wide-angle X-ray diffraction and small-angle X-ray scattering (SAXS) measurements indicated that the combined effect of oscillatory shear flow and GF network gave rise to a high fraction of shish-kebab structures in the OSIM samples. The OSIM samples with the two-scale reinforcement structure had enhanced tensile strength and improved impact strength, compared with the GF filled iPP samples prepared by conventional injection molding (CIM). However, the tensile strength and impact toughness of the OSIM iPP/GF composites were comparable to that of the OSIM iPP samples. This is because partial self-reinforced shish-kebab structures were replaced and weak interface was introduced along with the introduction of GF.
Key words: materials processing engineering; glass fibers; mechanical properties; shish-kebab structure; injection molding
发表期数: 2011年5月第9期
引用格式: 陈妍慧,杨皓然,张正驰,等. 两种尺度增强结构的聚丙烯形态与性能研究[J]. 中国科技论文在线精品论文,2011,4(9):802-808.
 
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