A Brønsted base is a substance that accepts a proton (H+) in a chemical reaction. In polymer chemistry, Brønsted bases can be used as catalysts in anionic polymerization. They can initiate the polymerization by abstracting a proton from the monomer, creating a reactive anionic species. Examples of Brønsted bases include ammonia, amines, and hydroxide ions.

布朗斯特碱是在化学反应中接受质子 (H+) 的物质。在高分子化学中，布朗斯特碱可用作阴离子聚合中的催化剂。它们可以通过从单体中提取质子来引发聚合，从而产生活性阴离子物质。布朗斯特碱的例子包括氨、胺和氢氧根离子。