改善SiO_(2)涂层与聚酰亚胺基体界面结合性能的研究  

Study on Improving the Interfacial Adhesion of SiO2 Coatings with Polyimide Matrix

作　　者：邱心宇 王丹[1] 徐灿 郭云[2] 刘惠涛[1] 高原[1] QIU Xin-yu;WANG Dan;XU Can;GUO Yun;LIU Hui-tao;GAO Yuan(College of Chemistry and Chemical Engineering,Yantai University,Yantai 264005,China;National Key Lab of Science and Technology on Vacuum Technology&Physics,Lanzhou Institute of Physics,Lanzhou 730000,China)

机构地区：[1]烟台大学化学化工学院,山东烟台264005 [2]兰州空间技术物理研究所真空技术与物理国防科技重点实验室,兰州730000

出　　处：《表面技术》2021年第3期315-322,共8页Surface Technology

基　　金：国家自然科学基金(51573155)。

摘　　要：目的利用硅烷偶联剂(SCA)有机官能基对有机物具有反应性或相容性的特点,探讨通过SCA改善SiO_(2)涂层与聚酰亚胺(PI,Kapton)基体界面粘附力的实验方法,提高SiO_(2)涂层与PI基体的结合强度,同时削弱因温度变化而引起的内应力。方法水热条件下,用低浓度碱液对PI表面进行处理,选取γ-氨丙基三乙氧基硅烷(KH-550)、γ-(2,3-环氧丙氧)丙基三甲氧基硅烷(KH-560)和γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)等三种不同的SCA,在溶剂热环境中与碱处理后的PI表面进行作用。用水汽辐照试验评价SCA与PI的结合状况。样品表面形貌用SEM扫描电镜和材料分析显微镜表征,表面润湿性用接触角测量仪测定,透光率用紫外可见分光光度计表征。结果经0.1 mol/L NaOH水热处理后,Kapton表面的水接触角由77°下降为53°。KH-550溶剂热环境下,在Kapton表面形成均匀的水解层。水汽辐照试验后,该水解层依然保持完整,透光率没有下降。但KH-560和KH-570水解层出现脱落,透光率分别下降了4.4%和9.3%。结论SCA虽然可以有效改善聚合物基体的润湿性,提高无机涂层与基体的界面粘附性,但在SCA选取上,必须考虑其与聚合物表面的相互作用。若SCA与聚合物基体的结合不牢固,反而更易造成涂层开裂、脱落,成为潜在的不稳定因素。Using the properties of silane coupling agent(SCA)to be reactive or compatible with organic matter,the experimental method of SCA to improve the interfacial adhesion between SiO_(2)coating and polyimide(PI,Kapton)matrix was discussed.This method improves the bonding strength between the SiO_(2)coating and PI matrix,while weakening the internal stress caused by temperature changes.Under hydrothermal conditions,the PI surface was removed with low concentration NaOH.Three different SCAs,such asγ-aminopropyl triethoxysilane(KH-550),γ-glycidoxypropyl trimethoxysilane(KH-560)andγ-methacryloxypropyl trimethoxysilane(KH-570),were selected to interact with PI surface in a solvothermal environment.The combination of SCA and PI was evaluated by water vapor and irradiation test.The surface morphologies of samples were characterized by SEM and material analysis microscope.The surface wettability was measured by contact angle meter,and the light transmittance was characterized by UV-vis spectrophotometer.After 0.1 mol/L NaOH hydrothermal treatment,the water contact angle of Kapton surface decreased from 77°to 53°.KH-550 could form a uniform hydrolyzed layer on the Kapton surface under solvothermal environment.After the water vapor and irradiation test,the hydrolyzed layer remained intact and the light transmittance did not decrease.However,the hydrolyzed layers of KH-560 and KH-570 fell off,and the light transmittance decreased by 4.4%and 9.3%,respectively.Although SCA can effectively improve the wettability of polymer matrix and the interface interfacial adhesion between inorganic coating and matrix,in the selection of SCA,whether it can react with polymer surface must be considered.If the SCA is not firmly bonded to the polymer matrix,it is more likely to cause the coating to crack and fall off,becoming a potential instability factor.

关 键 词：聚酰亚胺 表面改性 硅烷偶联剂 SiO_(2)涂层 粘附性 溶剂热 KAPTON 

分 类 号：TQ316.6[化学工程—高聚物工业]