聚乙烯醇高聚物保护疏水性氢氧化铁的机理——多核氢氧化铁-聚乙烯醇包合物的形成

A MECHANISM OF COLLOID PROTECTION FOR FERRIC HYDROXIDE WITH POLYVINYL ALCOHOL——THE FORMATION FOR TUBULAR INCLUSION SPECIES OF MULTI-NUCLEATE FERRIC HYDROXIDE WITH PVA

实验部分1.试剂和仪器:FeCl_3·6H_2O AR;NaOH AR;PVA(聚乙烯醇)牌号PVA-124日本进口分装.UV分光光度计(日本UV-300);波长488nm激光束(COHERENT,innoVA 70);X射线光电子能谱(XPS)仪(沈阳Np-1型);红外光谱(IR)仪(美国PE-577);电子自旋共振(ESR)仪(西德ER-420). 2.试样制备:A:5%PVA水溶液;B:100ml pH=2的A含0.1克FeCl_3·6H_2O;C,D:100ml pH=7和13的A分别加入0.1克FeCl_3·6H_2O形成的红棕色透明溶液;

Te 100ml of 6<pH≤13 aqueous solution contained 1～5% PVA, add 0.1grams of FeCl_3·6H_2O, a reddish brown and stable transparent solution is formed. The cause for the formation is studied by its XPS, IR, ESR, ultra violet and visible spectrum, and the formation process for the tubular inclusion speciels of the new emerging multi -nucleate ferric hydroxide with PVA is deduced as follows. The multi-nucleate ferric hydroxide is formed, and it fills speedily in the spiral tubular region of linear polymer PVA, when ferric ion is added to above PVA basic aqueous solution. Then a tubular inclusion substance is formed by that time, that is to say the multi-nucleate ferric hydroxide with hydroxylie bridge is included by the hydrophobic main chain of PVA with the aid of van der Waals force between the main chain of PVA and ferric hydroxide, when this main chain of carbon framework has faced toward the interior, but the hydrophilic hydroxy of PVA is faced on the body of water and interact on each other. Therefore, the reddish brown transparent solution appears to he very stable and the ferric hydroxide colloid is protected by PVA.