过氧化氢水热改性PMMA及其对界面粘附性的影响  

Hydrothermal Modification of PMMA with Hydrogen Peroxide and Its Effect on Interfacial Adhesion

作　　者：刘超[1] 曹晓雪 许洪珠 刘惠涛[1] 高原[1] LIU Chao;CAO Xiao-xue;XU Hong-zhu;LIU Hui-tao;GAO Yuan(College of Chemistry and Chemical Engineering,Yantai University,Yantai 264005,China)

机构地区：[1]烟台大学化学化工学院,山东烟台264005

出　　处：《表面技术》2022年第3期208-216,共9页Surface Technology

基　　金：国家自然科学基金(51573155)。

摘　　要：目的 利用过氧化氢(H_(2)O_(2))溶液的强氧化性,探索一种简单、实用的PMMA基材表面改性方法。研究室温及水热条件下H_(2)O_(2)对PMMA的作用机理,同时考察表面改性对PMMA基体与SiO_(2)涂层界面粘附性产生的影响。方法 采用不同浓度的H_(2)O_(2)溶液,在室温或水热条件下处理PMMA基材。用红外光谱仪(FTIR)测定PMMA改性前后表面化学组成的变化,用紫外可见分光光度计(UV-Vis)表征样品的透光率,通过测量水接触角评价样品表面的润湿性。采用磁控溅射法和Sol-Gel法分别在PMMA基材表面制备SiO_(2)涂层,用材料显微镜和原子力显微镜(AFM)分析表面形貌的微观变化,通过划格试验和摩擦试验评价涂层的附着力。结果 PMMA基材表面处理条件为30%(质量分数)H_(2)O_(2)溶液、水热温度60℃、时间1 h,水接触角由73°下降为56°。AFM分析表明,H_(2)O_(2)去除了PMMA表面的钝化层,磁控溅射法沉积的SiO_(2)颗粒形状规整,均匀致密。Sol-Gel法制备的涂层表面的可见裂纹由未改性多、室温改性少变为水热改性无。划格试验表明,在水热改性后,PMMA表面所制备的涂层没有脱落,评价为0级。结论 高浓度H_(2)O_(2)溶液水热处理PMMA基材改善了其表面润湿性,提高了PMMA与SiO_(2)涂层之间的界面粘附性。在改性后,PMMA表面所制备的SiO_(2)涂层由均匀致密的纳米颗粒组成,起到了一定的防护效果。Based on the strong oxidation property of H_(2)O_(2)solution, a simple and practical method for surface modification of PMMA substrate was explored. The mechanism of H_(2)O_(2)on PMMA at room temperature and hydrothermal conditions was studied, and the effect of surface modification on the interface adhesion between PMMA substrate and SiO_(2)coating was investigated. PMMA substrates were treated with different concentrations of H_(2)O_(2)solutions at room temperature or under hydrothermal conditions. Changes of surface chemical composition of PMMA before and after modification were measured by infrared spectrometer(FTIR);the light transmittance of sample was characterized by ultraviolet-visible spectrophotometer(UV-Vis);the surface wettability of sample was evaluated by the measurement of water contact angle. SiO_(2)coating was prepared on the surface of PMMA substrate by magnetron sputtering method and sol-gel method, respectively. The microscopic changes of surface morphology were analyzed by material microscope and atomic force microscope(AFM), and the coating adhesion was evaluated by cross-cut and friction test. The surface treatment conditions of PMMA substrate were 30wt% H_(2)O_(2)solution, hydrothermal temperature 60 ℃ and time 1h. The water contact angle decreased from 73° to 56°. AFM analysis showed that H_(2)O_(2)removed the passivation layer of PMMA, and the SiO_(2)particles deposited by magnetron sputtering were of regular shape, uniform and compact. The visible cracks on the surface of coating prepared by sol-gel method changed from more unmodified, less modified at room temperature to no hydrothermal modification. Cross-cut tests showed that coating prepared on the surface of hydrothermally modified PPMA did not fall off and was evaluated as grade 0. Hydrothermal treatment of PMMA substrate with high concentration H_(2)O_(2)solution improves its surface wettability and improves the interfacial adhesion between PMMA and SiO_(2)coating. SiO_(2)coating prepared on the surface of modified PMMA is c

关 键 词：聚甲基丙烯酸甲酯 过氧化氢 表面改性 二氧化硅涂层 水热法 

分 类 号：TG174.4[金属学及工艺—金属表面处理]