用凝胶色谱与自动粘度计的联用方法研究了聚醋酸乙烯酯的支化结构及支化分布。通过分级样的测定值和原样测定值的比较明确了聚醋酸乙烯酯的支化因子是各级分样支化因子的重均值,并从这两组样品测得的支化分布非常吻合,从分布图得到的临界分子量是2.5×10~5。 The branched structure and branching distribution of poly (vinyl acetate) were studied by the combination of gel chromatography and automatic viscometer. By comparing the measured value of the graded sample and the original measured value, it is clear that the branching factor of polyvinyl acetate is the weight average value of the branching factors at each level, and the branching distributions measured from these two samples are in good agreement. From The critical molecular weight obtained from the profile is 2.5 × 10 -5.