氢化丁腈橡胶的烯烃复分解反应

Metathesis of olefin of hydrogenated nitrile rubber

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 metathesis of olefin of hydrogenated nitrile rubber（HNBR） obtained by selective hydrogenation with nitrile rubber was studied in the presence of a ruthenium-based catalyst Zhan 1 B with and without addition of small molecular olefin.The structures of the metathetic products were characterized by size exclusion chromatography-viscosity analyzer-multi angle laser light scattering instrument.The results showed that Zhan 1 B effectively catalyzed the metathesis of olefin,and decreased the relative molecular mass of HNBR.The self-metathesis（without addition of 1-hexene） was less efficient than cross-metathesis （with addition of 1-hexene）,and the mean square radius of gyration and intrinsic viscosity of self-metathetic products were lower than those of cross-metathetic ones when the relative molecular masses were the same,which indicated that the great portion of self-metathetic products had ring structure and that of cross-metathetic ones linear structure.