The free radicals of coals in different ranks were characterized by ESR method.Their originproperties and variation of amount which are related to coal macromolecular structure arestudied.

• 应用ESR技术对一变质系列煤的自由基特性进行了实验研究,探讨了煤中自由基的起源、性质和数量的变化,并将其与煤的大分子结构相关联。