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约于1940年开始研究的甲基丙烯酸甲酯的辐射聚合,是辐射聚合中研究得最早和最多的单体之一。其研究路线,早期为场内辐射聚合,即整个聚合过程在辐射场内完成;后期则对场外辐射聚合(聚合过程在辐射场外完成)进行了一些研究工作。按自由基机构聚合的乙烯基单体,在辐射场内有氧存在下辐照时,由于最初生成的自由基与氧作用形成不稳定的过氧化物,单体不被聚合。当辐照体系离开辐射场,并去氧(抽真空或氮置换),或加还原剂后,形成的过氧化物立即分解,聚合以高速率进行。基于
Radiation polymerization of methyl methacrylate, which began in about 1940, is one of the earliest and most studied monomers in radiation polymerization. The research route, early for the field of radiation polymerization, that the entire polymerization process in the radiation field to complete the latter part of the off-site radiation polymerization (polymerization process in the radiation field to complete) conducted some research work. Vinyl monomers polymerized by a free-radical mechanism, when irradiated in the presence of oxygen in the radiation field, will not polymerize because the initially formed free radicals react with oxygen to form unstable peroxides. When the irradiation system leaves the radiation field and is deoxygenated (evacuated or nitrogen replaced) or added with a reducing agent, the peroxide formed breaks down immediately and the polymerization proceeds at a high rate. based on