MoO_2Br_2-Al(i-Bu)_2OPhCH_3-Allyl-X体系催化丁二烯聚合的紫外可见吸收光谱  

Study of Polymerization of Bytadiene with MoO_2Br_2-Al(i-Bu)_2OPhCH_3-Allyl-X Catalyst System by Using UV-VIS Spectroscopy

作　　者：王利峡[1] 陈滇宝[2] 扈梅 方旺喜 唐学明[2] 

机构地区：[1]青岛化工学院应化系 [2]青岛化工学院高材系

出　　处：《青岛化工学院学报（自然科学版）》1992年第4期31-37,共7页Journal of Qingdao Institute of Chemical Technology(Natural Science Edition)

基　　金：国家自然科学基金

摘　　要：用紫外可见光谱法考察了MoO_2Br_2-Al(i-Bu)_2OPhCH_3(-m)催化体系中添加第三组分-烯丙基卤(A11yl-X),对丁二烯聚合的影响.结果表明,MoO_2Br_2的乙酸乙酯溶液在340nm和780nm处有两个特征吸收峰.其中780nm处归属为Mo(V)的自旋允许d-d跃迁吸收峰.烯丙基卤能与Mo形成π络合物,随Al/Mo增加,其电荷迁移峰由340nm移向380nm,且烯丙基卤和丁二烯可分别与Mo(Ⅲ)形成的π络合物,其特征吸收峰均在380nm处.同时表明,Al(i-Bu)_2OPhCH_3(-m)易与烯丙基溴反应,可使烯丙基溴-Mo(Ⅲ)络合物解络合.The effect of adding the third component to MoO_2Br_2-Al(i-Bu)_2 OPhCH_3 catalyst system on the polymerization of butadiene was studied. Theoe were two charactersitic absorption bands respectively at 340 and 780 nm for the ethyl acetate solution with MoO_2Br_2, and the band at 780nm resulted from the spin-allowed d-d transition of Mo(V). The allyl halogen could form π-complex with molybdenum. As the molar ratio of Al/Mo increased, the peak of the characteristic adsorption band of the electric charge transition was shifted from 340nm to 380nm, and for the π-complex of Mo (Ⅲ) it was at 380nm. Al(i-Bu)_2OPhCH_3 was liable to react with Allyl-Br, which would lead to decomplexation of Mo (Ⅲ)-Allyl-Br complex.

关 键 词：聚丁二烯 催化 紫外 光谱学 橡胶 

分 类 号：TQ333.2[化学工程—橡胶工业]