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有机阳离子改性蒙脱土已广泛应用于聚合物改性制备高性能聚合物。本文合成了不同代数G0(零代)、G2(二代)的树枝状大分子聚酰胺-胺(PAMAM),同时对G0、G2代PAMAM进行了季铵化改性,得到了PAMAM季铵盐,进一步用PAMAM季铵盐插层改性钠基蒙脱土(Na+-MMT)得到了PAMAM季铵盐改性蒙脱土(PAMAM/MMT)。XRD分析表明,PAMAM季铵盐己与Na+-MMT中的Na+进行了离子交换,同时提出了G0、G2代PAMAM季铵盐对MMT的双分子和单分子插层模型。进一步研究了PAMAM/MMT对聚碳酸酯(PC)的流变性能的影响规律,结果表明PAMAM/MMT可明显降低聚碳酸酯熔融剪切粘度,有利于提高其加工性能。
Organic cation modified montmorillonite has been widely used in polymer modification to prepare high performance polymer. In this paper, dendrimer polyamide-amine (PAMAM) with different algebraic G0 (zero generation) and G2 (second generation) was synthesized. At the same time, the PAMAM of G0 and G2 generation were modified by quaternary ammonium modification, PAMAM quaternary ammonium salt modified montmorillonite (PAMAM / MMT) was obtained by intercalation modification of sodium montmorillonite (Na + -MMT) with PAMAM quaternary ammonium salt. XRD analysis showed that the PAMAM quaternary salt had ion exchange with Na + in Na + -MMT, and the bimolecular and monolayer intercalation models of PAMAM quaternary ammonium salts of G0 and G2 on MMT were proposed. The effect of PAMAM / MMT on the rheological properties of polycarbonate (PC) was further investigated. The results show that PAMAM / MMT can significantly reduce the melt shear viscosity of polycarbonate and improve its processing performance.