双丙酮丙烯酰胺参与共聚的聚丙烯酸酯乳液的制备及其应用

肼;聚氨酯;乳液性质;交联;双丙酮丙烯酰胺参与共聚的聚丙烯酸酯乳液的制备及其应用     

Mg2NiH4对高氯酸铵热分解过程的影响

采用置换-扩散法制备了储氢材料Mg2NiH4, 用XRD, ICP和DSC-TG方法对其结构进行了表征. 用热分析法(DSC)研究了Mg2NiH4对高氯酸铵(AP)热分解过程的影响. 研究结果表明, Mg2NiH4对AP热分解过程有较大影响. Mg2NiH4可以显著促进AP的低温热分解过程, 降低高温热分解温度, 使DSC表观分解热明显增大. 随着加入量的增加, Mg2NiH4对AP热分解的催化促进作用增强, 当Mg2NiH4加入的质量分数为30％时, DSC表观分解热最大. 吸氢量越大, 储氢材料对AP的催化促进作用越强. Mg2NiH4催化促进AP分解过程的作用机理为: Mg2NiH4分解释放的H2及Mg和Ni与AP分解产物发生反应.     

聚氨酯水分散体交联剂的合成及结构表征

聚氨酯水分散体交联剂的合成及结构表征;Michael加成反应;酮肼反应     

纳米铜粉对高氯酸铵热分解的影响

The decomposition behaviour of ammonium perchlorate (AP) has been investigated in the presence of Cu nanopowder by DTA. The results show that nanometer Cu powder decreased the first and second thermal decomposition temperature of AP by 35.1 ℃ and 130.2 ℃, respectively, and the DTA heat release of AP in the presence of Cu nanopowders increased to 1.20 kJ·g^-1, showing good catalytic effect on the thermal decomposition of AP. The catalytic effect of Cu micron-size powder on the thermal decomposition of AP was less than that of Cu nanopowder. With the increase in content, Cu nanopowder enhanced its catalytic effect on the high temperature decomposition of AP, however, it weakened its catalytic effect on the low temperature decomposition of AP. The mechanism of catalysis for the thermal decomposition of AP is as follows: (1) metal oxider acts as the intermedium in the process of election tranfer, (2) Cu nanopowder reacts with the decomposed product of AP, (3) Cu nanopowder has special surface effect.