(1. 中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室，長沙 410083；
2. 中南大學(xué) 化學(xué)化工學(xué)院，長沙 410083)
摘 要: 為了提高銅金粉的耐腐蝕性能，采用甲基丙烯酸甲酯(MMA)原位聚合對銅金粉進(jìn)行了有機(jī)聚合物的包覆，以吸光度、光澤度與接枝率為主要評價指標(biāo)，探討單體用量、引發(fā)劑用量、偶聯(lián)劑用量對原位聚合過程的影響，并采用IR、SEM和XRD等手段對包覆前后的銅金粉進(jìn)行表征。結(jié)果表明：當(dāng)m(MMA)/m(Cu)=0.2時，表面包覆PMMA后的銅金粉具有良好的耐腐蝕性能與光澤度；當(dāng)m(AIBN)/m(MMA)=0.05時，耐腐蝕性能最佳，而此時的接枝率也達(dá)到最高點(diǎn)，即耐腐蝕性能與接枝率之間存在一定的對應(yīng)關(guān)系；偶聯(lián)劑MPS的加入有利于提高銅金粉的耐腐蝕性能，這是由于其分子結(jié)構(gòu)中具有甲氧基(OCH3)與碳碳雙鍵(C=C)，形成具有特殊功能的“分子橋”所致，從而將銅金粉與PMMA通過化學(xué)鍵牢固地結(jié)合起來。
關(guān)鍵字: 甲基丙烯酸甲酯；原位聚合；包覆；銅金粉；耐腐蝕性能
methyl methacrylate
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract: 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.
Key words: methyl methacrylate; in-situ polymerization; encapsulation; bronze powder; corrosion resistance
