有两种或两种以上单体参加的混缩聚或共缩聚反应中在达到凝胶点以前的线形缩聚阶段，反应体系中实际能够参加反应的官能团数与单体总物质的量之比。 能起反应的官能团总当量数 (1)当Na=Nb+Nc时，平均官能度f =(faNa+fbNb+fcNc)/(Na+Nb+Nc) (2)当Na=Nb+Nc时，平均官能度f =2(+fbNb+fcNc)/(Na+Nb+Nc) 总分子数 例：2丙三醇+ 3邻苯二甲酸酐→丙三醇—邻苯二甲酸酯树脂 平均官能度= （2×3 + 3×2）/（2+3）= 2．4
平均官能度是影响醇酸树脂配方设计的重要参数。
The average function degree is an important parameter to design the formulation of the alkyd resins.
对于近年文献上提出的官能度分布和平均官能度问题，我们也就本文所涉及的反应体系作了理论上的探讨。
For the reaction system involved in this paper, the functionality distribution and the average functionality which have been proposed recently in literature were studied theoretically.
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