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研究了丁腈橡胶经选择性催化加氢后得到的氢化丁腈橡胶(HNBR)在钌基催化剂Zhan 1 B作用下以及有无外加低分子烯烃条件下的烯烃复分解反应,并用尺寸排阻色谱-多角度激光光散射-黏度检测联用仪对HNBR的2种烯烃复分解反应产物的结构进行了表征。结果表明,钌基催化剂Zhan 1 B可以有效地催化HNBR的烯烃复分解反应,降低其相对分子质量;HNBR的烯烃自复分解反应(无外加烯烃)比交叉复分解反应(有外加烯烃)的效率低;相对分子质量相同时,自复分解反应产物的均方旋转半径及特性黏数值均低于相应的交叉复分解反应产物,由此推断HNBR的烯烃自复分解反应产物主要为环状结构,而交叉复分解反应产物主要为线型结构。
The olefin metathesis of hydrogenated nitrile rubber (HNBR) obtained by the selective catalytic hydrogenation of nitrile rubber under Zhan 1 B ruthenium-based catalyst with or without addition of low molecular weight olefins was studied. The effect of size exclusion chromatography- The structures of two kinds of olefin metathesis reaction products of HNBR were characterized by multi-angle laser light scattering-viscosity testing. The results show that the Ru-based catalyst Zhan 1 B can effectively catalyze the olefin metathesis of HNBR and reduce its relative molecular mass. The HNBR has a lower efficiency of olefin autolytic reaction (with no added olefin) than the cross-metathesis reaction (with addition of olefin) When the molecular mass is the same, the mean square radius of gyration and intrinsic viscosity of the product are lower than that of the corresponding cross-metathesis reaction product. Therefore, it is concluded that the product of HNBR olefin autodegradation mainly has a ring structure, while the cross-metathesis reaction product mainly For the linear structure.