【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。更多还原

【Abstract】 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.更多还原