Preparation of surface conductive thermosetting polyimide composites by surface modification self-metallization process
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摘要: 采用碱刻蚀/离子交换的方法对碳纤维增强热固性聚酰亚胺基复合材料进行了表面自金属化,制备了表面覆银导电聚酰亚胺复合材料。表征了聚酰亚胺复合材料表面酰亚胺五元环开环程度随碱液刻蚀条件的变化,研究了碱液刻蚀、酸洗、离子源和离子交换时间对复合材料表面导电性和力学性能的影响。当碱液刻蚀5 h、离子交换9 h时,热固性聚酰亚胺复合材料表面方块电阻可达0.26 Ω·sq−1,且基本力学性能得到保持。
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关键词:
- 热固性聚酰亚胺复合材料 /
- 金属化 /
- 碱刻蚀 /
- 导电性 /
- 力学性能
Abstract: Carbon fiber reinforced thermosetting polyimide composites were surface self-metallized by alkali modification/ion exchange method, and silver-coated conductive polyimide composites were prepared. The degree of ring-cleavage reaction of imide five-membered rings on the surface of polyimide composites was characterized as a function of alkali modification conditions. The effects of alkali modification, acid washing, ion source and ion exchange time on the surface conductivity and mechanical properties of polyimide composites were investigated. When modify in alkali solution for 5 h and ion exchange for 9 h, the surface resistance of thermosetting polyimide composites can reach 0.26 Ω·sq−1, and the basic mechanical properties are maintained. -
表 1 聚酰亚胺复合材料表面电阻与碱刻蚀时长和离子交换时长关系
Table 1. Relationship between surface resistance of polyimide composites and alkali modification time and ion exchange time
Modification Surface resistance/(Ω·sq−1) Ion-exchange 3 h Ion-exchange 9 h Ion-exchange 24 h 0 h Non-conducting Non-conducting Non-conducting 3 h 0.57 0.50 0.84 5 h 0.37 0.26 0.39 7 h 0.22 0.18 0.20 22 h 0.49 0.24 0.25 表 2 聚酰亚胺复合材料表面银层电阻与酸洗工艺和离子交换时长关系
Table 2. Relationship between the silver layer resistance of polyimide composites and acid washing process and ion exchange time
Kinds of acid Concentration/% Pickling time/min Ion exchange time/min Surface resistance/(Ω·sq−1) HCl 10 30 5 — HNO3 10 30 5 0.65 HNO3 10 30 10 0.54 HNO3 10 60 5 1.08 HNO3 20 30 10 0.94 -
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