不同分子量聚酯的羟值分析方法  

Hydroxyl Number Determination of Polyesters with Different Molecular Weight

作　　者：俞晓薇[1] 胡巧玲[1] 傅晏彬[1] 朱永群[1] 

机构地区：[1]杭州大学化学系,310028

出　　处：《聚氨酯工业》1997年第1期44-46,共3页Polyurethane Industry

摘　　要：用醋酐／高氯酸／乙酸乙酯法、醋酐／吡啶回流法，分别对相对分子质量为1100～12000的聚酯进行了羟值的测定，并用蒸气压渗透法和析出物溶解重滴法进行了核对。结果表明醋酐／高氯酸／乙酸乙酯法对于M-＜50000的聚酯是适用的，而高分子量的聚酯则必须用醋酐／吡啶回流法，才能获得满意的结果。The hydroxyl number of polyester diols with different molecular weight (M=1 100~12 ooo) has been determined by end-group analysis, which include acetic anhydride/perchloric acid/acetic acetate and acetic anhydride/pyridine method. The mo1ecularweight calculated was checked by vapour pressure osmometry. The result shows acetic an-hydride/perchloric acid/acetic acetate method is suitable for polyester diols with M<5000. But to the higher molecular weight polyester,accurate result will be obtainted whenadopt acetic anhydride /pyridine reflux method.

关 键 词：聚酯 羟值 分子量 端基分析 

分 类 号：TQ323.407[化学工程—合成树脂塑料工业]