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研究了聚氧乙烯链封端的非离子型聚酰胺-胺树状聚合物的热稳定性以及在造纸助留和催化剂载体上的应用。结果表明,该类树状聚合物具有较好的热稳定性,温度低于300℃无明显热分解行为,最大的热分解温度均为400℃。助留性能测试表明,M4.0G与P44复配双元助留体系(摩尔比1∶23.22),造纸助留率为89.2%,比空白造纸助留率分别提高了18.3%。纸样的物理机械特性:撕裂指数、撕裂强度、耐破指数、耐破强度和抗张指数比空白纸样分别提高了8.6%、1.5%、35.5%、29.6%和4.3%。TEM测试表明:以聚氧乙烯大单体(PEO-A)链封端的聚酰胺-胺树状聚合物样品封装的钯金属纳米粒子单分散性较好,粒径分布在0.75～2.4nm。
The thermal stability of polyoxyethylene chain terminated nonionic polyamide-amine dendrimers was studied and their applications in papermaking retention and catalyst support were studied. The results show that this kind of dendrimer has good thermal stability. When the temperature is lower than 300 ℃, there is no obvious thermal decomposition, and the maximum thermal decomposition temperature is 400 ℃. Retention performance tests showed that the retention rate of papermaking with M4.0G and P44 was 89.2%, which was 18.3% higher than that of blank paper. The physical and mechanical properties of the paper samples were improved by 8.6%, 1.5%, 35.5%, 29.6% and 4.3% respectively compared with the blank paper samples. The tear index, the tear strength, the burst index, the burst strength and the tensile index were all higher than those of the blank paper. The results of TEM showed that the monodispersity of palladium metal nanoparticles encapsulated with PEO-A chain terminated polyamide-amine dendrimer was better and the particle size distribution was in the range of 0.75-2.4 nm.