天然胶乳小分子模型物的溴化反应历程研究

选择与天然橡胶（ NR）分子链节具有相似结构的小分子2－甲基－2－丁烯作为天然橡胶溴化反应的参照模型，通过乳液法使小分子发生溴化反应，应用傅立叶红外光谱和气相色谱－质谱联用等测试手段对小分子溴化反应产物结构进行表征，并探讨小分子溴化反应历程。结果表明，小分子2－甲基－2－丁烯的C＝C双键在溴化过程中被还原为C－C单键，同时发生甲基氢原子的溴化取代，但溴化产物中并没有醛类物质生成。乳液法小分子溴化反应可能是自由基反应历程，且没有出现次溴酸参与反应历程的现象。

The Brominated Mechanism of Small Molecular Model for Nature Rubber Latex

The small molecule 2-methyl-2-butene, with similar structure to the molecular chain of natural rubber （NR）, was chosen as the reference model for natural rubber bromination.The small molecule was brominated by emulsion method.The product structure for small molecule bromination was characterized using fourier transform infrared spectroscopy and GC-MS, etc., and the bromination mechanism of small molecule was investigated.The results showed that in the process of bromination, the C=C double bond on the molecule of 2-methyl-2-butene was reduced to the C-C single bond and the hydrogen atoms of methyl were substituted by bromine, but there was no aldehydes among the brominated products.The bromination of small molecule by emulsion may be the course of free radical reaction, and hypobromous acid not involved in the reaction process.