蒙脱土改性聚甲基丙烯酸甲酯复合材料的硫酸腐蚀行为

对乳液聚合法制备出的聚甲基丙烯酸甲酯/蒙脱土(PMMA/MMT)复合材料在硫酸介质中的腐蚀情况进行了研究,探讨了蒙脱土含量、硫酸浓度以及腐蚀时间对腐蚀速率的影响。结果表明,硫酸浓度较低且腐蚀时间较短时,含有2%~3%蒙脱土的复合材料的腐蚀速率比PMMA明显降低;PMMA及其复合材料的腐蚀速率随腐蚀时间的延长而下降,随硫酸浓度的增加而上升;硫酸浓度越高或腐蚀时间越长,复合材料中蒙脱土的片层阻隔作用越不明显。

CORROSION BEHAVIOR OF POLY (METHYL METHACRYLATE)/MONTMORILLONITE COMPOSITE IN SULFURIC ACID

The effects of concentration and corrosion time of sulfuric acid and content of montmorillonite on the corrosion rates of poly(methyl methacrylate)(PMMA) and poly(methyl methacrylate)/montmorillonite composite,prepared by emulsion polymerization,in sulfuric acid were studied using weight loss testing method.The corrosion rate of the composite containing 2%~3% montmorillonite was lower obviously than that of pure PMMA when the concentration of sulfuric acid was low and time of corrosion was short,the corrosion rates of both PMMA and its composite decreased with the increasing of corrosion time,while increased with the increasing of the concentration of sulfuric acid.The longer the corrosion time or the higher the concentration of sulfuric acid,the weaker the barrier ability of montmorillonite layer in the composite.