物理交联聚乙烯醇/羟基末端聚酰胺-胺树型高分子水凝胶的制备与性质研究

Novel physically cross-linked hydrogels, composed of PVA and hydroxy-terminated polyamidoamine(PAMAM) dendrimer G6-OH, were prepared by cyclic freezing/thawing treatment of aqueous solutions containing PVA and G6-OH. FTIR analysis indicates that PAMAM dendrimer G6-OH was successfully introduced into PVA hydrogels. Higher contents of G6-OH in PVA/G6-OH hydrogels resulted in higher swelling ratios, and faster reswelling rates. With the increase of freezing/thawing cyclic times, the swelling ratios and reswelling rates of PVA/G6-OH hydrogels decreased, which is similar to that of physically cross-linked PVA hydrogel.

水溶性转化型除锈防锈漆的研制

1 引言 本世纪五六十年代国内外开始研究带锈涂刷的防腐材料。这类防锈漆大致可分为稳定型、渗透型、转化型三类,其中以转化型最佳。转化型除锈防锈漆涂刷到带锈的金属表面上以后,首先和锈层反应将其转化为稳定的无机护层,同时和金属表面反应生成一层致密的磷化膜对金属起钝化作用。所以这种转化型除锈防锈漆融除锈、防锈和金属钝化于一体,是今后大型野外设备的防腐的最佳选择。但目前这类涂料多以价格昂贵的醛酮或醇类为溶剂,成本比较高,

多相铂催化剂在芳香族化合物加氢中的应用

介绍了负载型铂催化剂、高分子铂络合物催化剂和负载型含铂双金属催化剂等几种多相铂催化剂在芳香族化合物加氢中的应用及各自特点,展示这类催化剂在反应中具有良好的催化活性。