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多巴胺表面改性反应时间对镀银玻璃微球及导电硅橡胶性能的影响
李润源, 王建月, 王姝瑛, 于焕光, 侯杰
航天材料及工艺研究所, 北京 100076
摘要:
利用聚多巴胺(PDA)优异的黏结性能对镀银玻璃微球(SiO2/Ag)进行表面改性,在不影响导电硅橡胶的导电性的前提下,提高导电硅橡胶的力学性能。结果表面,PDA改性能够提高SiO2/Ag在硅橡胶中的分散性,控制反应时间能够实现PDA层厚度可控,从而实现导电硅橡胶导电性可控。改性反应时间为8 h时,SiO2/Ag填充的导电硅橡胶的Payne效应,损耗角正切(tanδ),正硫化时间(T90),静态接触角达到最小,拉伸强度最大,电学性能符合应用标准。
关键词:  镀银玻璃微球  多巴胺  表面改性  导电硅橡胶  分散性
DOI:10.12044/j.issn.1007-2330.2018.02.003
分类号:TB3
基金项目:
Effect of Dopamine Surface Modification Time on Properties of Silver Coated Silica Microsphere and Conductive Silicone Rubber
LI Runyuan, WANG Jianyue, WANG Shuying, YU Huanguang, HOU Jie
Aerospace Research Institute of Materials & Processing Technology, Beijing 100076
Abstract:
The surface modification of silver coated silica microsphere (SiO2/Ag) was carried out by using excellent bonding properties of polydopamine (PDA) to improve the mechanical properties of conductive silicone rubber without affecting the conductivity of conductive silicone rubber. The results show that PDA surface modification can improve the dispersion of SiO2/Ag in silicone rubber. By controlling the reaction time, controllable thickness of PDA layer can be achieved so that controlling the conductive silicon rubber conductivity can be achieved. The Payne's effect, loss angle of tangent (tanδ), optimum curing time (T90), contact angle and tensile strength of conductive silicone rubber filled with modified SiO2/Ag reach the optimum state when the PDA coating time is 8 h and electrical performance meets application standards.
Key words:  Silver coated silica microsphere  Dopamine  Surface modification  Conductive silicone rubber  Dispersibility