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氧氣DBD等離子體處理PBO纖維表面及其對雙馬樹脂基復合材料界面性能的影響

2021-04-26 15:36:55 作者：劉哲來源：材料研究學報分享至：

摘要

采用氧氣介質阻擋放電（DBD）等離子體處理PBO纖維表面，用以改善PBO纖維與雙馬來酰亞胺（BMI）樹脂之間的界面粘結性能。結果表明，用氧氣等離子體處理PBO纖維能大幅度提高PBO/BMI復合材料的層間剪切強度（ILSS）值，最佳處理條件為功率30 W/m3、時間24 s，ILSS值從43.9 MPa提高到62.0 MPa。經過氧氣DBD等離子體處理的PBO纖維其表面的氧含量明顯提高，氮含量變化不大，甚至在過度處理時降低；官能團-O-C=O基團的含量從0提高到3.16%，-C-O-的含量也明顯提高；在氧氣DBD等離子體處理后的PBO纖維表面產生大量凹凸不平和溝壑，使纖維表面的粗糙度提高。而表面氧含量的提高和表面形貌與粗糙度的變化，是PBO/BMI復合材料ILSS值提高的重要原因。單絲拉伸實驗結果表明，適當的DBD等離子體處理不會對PBO纖維表面產生不良影響，不影響其在復合材料中的作用。

關鍵詞：材料表面與界面 ; DBD等離子體 ; PBO纖維 ; 表面形貌 ; 化學成分 ; 界面粘結強度

Abstract

Poly-p-phenylene benzobisoxazole （PBO） fibers surface were treated by oxygen dielectric barrier discharge （DBD） plasma to improve the interfacial adhesion between PBO fibers and bismaleimide （BMI） resin. The inter laminar shear strength （ILSS） of PBO/BMI composites greatly increased from 43.9 MPa to 62.0 MPa after oxygen plasma treatment for 24 s with the optimal parameter of 30 W/m3. After oxygen DBD plasma treatment the O content on the surface of PBO fibers increased significantly, but that of N did not change much, even decreased after being overtreated. The content of functional groups -O-C=O group increased from 0 to 3.16%, while the content of -C-O- increased significantly. The oxygen DBD plasma treatment produced a lot of bumps and ravines on the surface of PBO fibers. The surface morphology of the fibers becomes complex and their surface roughness was enhanced to certain extent. The increase of surface oxygen content, as well as the change of surface morphology and roughness are the important reasons for the increase of ILSS value of PBO/BMI composites. In addition, appropriate DBD plasma treatment will not have a significant adverse impact on the tensile strength of PBO fibers, will not affect its role in composite materials.

Keywords： surface and interface in the materials ; DBD plasma ; PBO fiber ; surface morphology ; chemical ; interfacial adhesion strength