共聚焦拉曼成像技术研究PE-LD/EVOH共混物的三维相结构
Study on 3D phase structure in low density polyethylene/ethylene-vinyl alcohol copolymer(PE-LD/EVOH)blends through confocal Raman imaging
张春波 1刘宣伯 1姚雪容 1苏萃 1施红伟 1张龙贵 1张韬毅1
作者信息
- 1. 中石化(北京)化工研究院有限公司,北京 100013
- 折叠
摘要
利用共聚焦拉曼成像技术研究了低密度聚乙烯(PE-LD)/乙烯-乙烯醇共聚物(EVOH)共混物中各相在压塑样品水平方向、深度方向和三维空间的分布情况,首次获得了PE-LD/EVOH共混物的三维相结构,并直观地将相区与共混物化学成分相对应.结果表明,PE-LD/EVOH共混物为不相容体系;当EVOH的质量分数为20%时,其作为分散相,以较规则的圆柱体形态分散于PE-LD基体中,圆柱直径尺寸在3～6 μm范围内.加入马来酸酐接枝聚乙烯(PE-g-MAH)作为相容剂后,共混物的相态结构发生显著变化,分散相形状由规则变为不规则,截面的平均尺寸减小到约2 μm,这说明PE-g-MAH可显著增强PE-LD与EVOH两组分间的界面相容性.
Abstract
The phase structure of polymer blends directly affects the macroscopic properties of the materials;therefore,it is important to investigate the size and spatial distribution of each phase.In this work,the confocal Raman imaging tech-nique was adopted to study the distribution of phases of PE-LD/EVOH blends in the horizontal and depth directions and 3D space in the compression-molded specimens.The phase structure of PE-LD/EVOH blends in 3D space was obtained at the first time,and the phase region visually corresponded to the chemical composition of the blends.The results indi-cated that the PE-LD/EVOH blends were immiscible system.20 wt%EVOH could be dispersed in the PE-LD matrix in a regular cylindrical form with a diameter of the cylinder in the range of 3～6 μm.The introduction of polyethylene grafted with maleic anhydride(PE-g-MAH)made the phase structure change significantly from the regular to irregular shape,and the cross-section size was reduced to 2 μm.This indicates that PE-g-MAH can enhance the compatibility be-tween PE-LD and EVOH significantly.
关键词
拉曼成像/低密度聚乙烯/乙烯-乙烯醇共聚物/共混物/三维相结构Key words
Raman imaging/low-density polyethylene/ethylene-vinyl alcohol copolymer/blend/3D phase structure引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据