Stoichiometric imbalance (r) refers to the deviation from the ideal stoichiometry in a polymerization reaction. In step-growth polymerization, the stoichiometry of the reactants is crucial for achieving high molecular weights. If there is an imbalance in the stoichiometry, one type of functional group will be in excess, limiting the extent of reaction and the molecular weight of the polymer. The stoichiometric imbalance is often expressed as the ratio of the initial concentrations of the two functional groups.

化学计量失衡 (r) 是指聚合反应中偏离理想化学计量。在逐步增长聚合中，反应物的化学计量对于实现高分子量至关重要。如果化学计量不平衡，一种类型的官能团将过量，从而限制反应程度和聚合物的分子量。化学计量失衡通常表示为两种官能团初始浓度的比率。