Reactivity, in the context of chemistry, refers to the tendency of a substance to undergo a chemical reaction. The reactivity of a substance is influenced by factors such as its electronic structure, steric hindrance, and the presence of functional groups. In polymer chemistry, the reactivity of monomers and polymers is crucial for understanding polymerization reactions, polymer modification, and degradation processes.

在化学中，反应活性是指物质发生化学反应的趋势。物质的反应性受其电子结构、空间位阻和官能团的存在等因素的影响。在高分子化学中，单体和聚合物的反应性对于理解聚合反应、聚合物改性和降解过程至关重要。