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单体一般是不饱和的或含有两个或更多官能团的小分子化合物。由于单体经过某些化学反应(如加聚、缩聚、开环等)生成高聚物,所以在高分子链中,单体转变为在化学组成上能够重复的最小单位,即链节。判断高聚物的单体,就是根据高分子链,结合单体间可能发生的反应机理,找出高分子链中的链节,然后将其完形便得其单体。结合中学课本,归纳出以下几条判断单体的规律。一、由加聚产物推断单体两种(或两种以上)单体可以同时进行聚合,生成含有这两种(或两种以上)结构单位的大分子。烯类及其衍生物常起加聚反应生成高分子化合物。1.凡链节的主碳链为两个碳原子,其单体必为一种。将链节的两个半键闭全即为单体。如
Monomers are typically small molecule compounds that are unsaturated or contain two or more functional groups. As the monomer through certain chemical reactions (such as polyaddition, polycondensation, ring opening, etc.) to generate polymers, so in the polymer chain, the monomer into a chemical composition can repeat the smallest unit, that is, the link. Judgment of polymer monomer, is based on the polymer chain, combined with the possible reaction mechanism between monomers to find the chain link in the polymer chain, and then over its shape will have its monomer. Combined with high school textbooks, summed up the following few rules to determine the monomer. First, the polyaddition product deduced monomer Two (or two or more) monomer can be polymerized at the same time, resulting in containing these two (or two or more) structural units of macromolecules. Ethylene and its derivatives often polyaddition reaction of polymer compounds. 1. Where the main carbon chain link is two carbon atoms, the monomer must be a. The two half-key link is full of monomer. Such as