中国塑料 ›› 2024, Vol. 38 ›› Issue (4): 1-5.DOI: 10.19491/j.issn.1001-9278.2024.04.001

• 材料与性能 •    

共聚焦拉曼成像技术研究PE⁃LD/EVOH共混物的三维相结构

张春波(), 刘宣伯(), 姚雪容, 苏萃, 施红伟, 张龙贵, 张韬毅   

  1. 中石化(北京)化工研究院有限公司,北京 100013
  • 收稿日期:2023-09-13 出版日期:2024-04-26 发布日期:2024-04-22
  • 通讯作者: 刘宣伯(1981—),男,研究员,研究方向为高分子材料的结构与性能,liuxb.bjhy@sinopec.com
    E-mail:zhangchb.bjhy@sinopec.com;liuxb.bjhy@sinopec.com
  • 作者简介:张春波(1988—),女,副研究员,研究方向为高分子物理与结构表征,zhangchb.bjhy@sinopec.com
  • 基金资助:
    中国石化科技开发项目(420047?3)

Study on 3D phase structure in low density polyethylene/ethylene⁃vinyl alcohol copolymer (PE⁃LD/EVOH) blends through confocal Raman imaging

ZHANG Chunbo(), LIU Xuanbo(), YAO Xuerong, SU Cui, SHI Hongwei, ZHANG Longgui, ZHANG Taoyi   

  1. SINOPEC (Beijing) Research Institute of Chemical Industry Co,Ltd,Beijing 100013,China
  • Received:2023-09-13 Online:2024-04-26 Published:2024-04-22
  • Contact: LIU Xuanbo E-mail:zhangchb.bjhy@sinopec.com;liuxb.bjhy@sinopec.com

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。

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

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 technique 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 indicated 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 between PE⁃LD and EVOH significantly.

Key words: Raman imaging, low?density polyethylene, ethylene?vinyl alcohol copolymer, blend, 3D phase structure

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