甲基丙烯酸甲酯原位聚合包覆铜金粉

Bronze powder encapsulated by in-situ polymerization of methyl methacrylate

为了提高铜金粉的耐腐蚀性能,采用甲基丙烯酸甲酯(MMA)原位聚合对铜金粉进行了有机聚合物的包覆,以吸光度、光泽度与接枝率为主要评价指标,探讨单体用量、引发剂用量、偶联剂用量对原位聚合过程的影响,并采用IR、SEM和XRD等手段对包覆前后的铜金粉进行表征。结果表明:当m(MMA)/m(Cu)=0.2时,表面包覆PMMA后的铜金粉具有良好的耐腐蚀性能与光泽度;当m(AIBN)/m(MMA)=0.05时,耐腐蚀性能最佳,而此时的接枝率也达到最高点,即耐腐蚀性能与接枝率之间存在一定的对应关系;偶联剂MPS的加入有利于提高铜金粉的耐腐蚀性能,这是由于其分子结构中具有甲氧基(OCH3)与碳碳双键(C=C),形成具有特殊功能的"分子桥"所致,从而将铜金粉与PMMA通过化学键牢固地结合起来。

In order to improve its corrosion resistance, bronze powder was encapsulated by in-situ polymerization of methyl methacrylate （MMA）. Using the absorbance, gloss and concentration of grafting as the main targets, the effect of monomer amount, initiator （AIBN） amount and coupling agent （MPS） amount on the polymerization was studied. The unencapsulated and encapsulated bronze powders were characterized by IR, SEM, and XRD. The results show that the encapsulated sample has good corrosion resistance and gloss synchronously when m（MMA）/m（Cu） is 0.2. Furthermore, when m（AIBN）/m（MMA） is 0.05, the corrosion resistance reaches the highest value, and the concentration of grafting also reaches the maximum, which implies that the corresponding relationship exists between the corrosion resistance and the concentration of grafting. The addition of MPS is helpful to improve the anticorrosion property of bronze powder, which is due to that there are OCH3 and C=C in the structure of MPS. Because the molecular bridge with special function can be formed, bronze powder is firmly combined with PMMA by chemical bonding.