以双环戊二烯二氯化钛(Cp2TiCl2)为主催化剂,邻苯二甲酸二甲酯(DMP)为助催化剂研究了苯乙烯丁二烯嵌段共聚物选择性催化加氢动力学。在76℃、适宜的氢气压力以及主、助催化剂浓度下进行SBS加氢动力学研究得到动力学方程为-d[c(C=C) ]/dt =kc1 (C=C )p1.12 (H2 )c1 (Ti )c-2 (DMP),相应的在70~84℃范围内加氢反应活化能为83.48kJ/mol。对加氢产物微观结构分析表明该催化体系加氢效率高,选择性高,且对SBS中PB链段1,2-结构和反式1,4-结构先加氢,并且达到完全饱和.
Abstract
The kinetic behavior of hydrogenation of styrene butadiene styrene tri block copolymers (SBS, S/B=3/7,linear) using the bis (cyclopentadineyl) titanium dichloride (Cp2TiCl2) as a catalyst and dimethyl (o-) phthialate (DMP) as a cocatalyst was systematically studied. It was showed that the catalysts had a high activity and a high selectivity with phenyl not being hydrogenated. The kinetics equation of hydrogenation,which was obtained with proper concentrations of the catalyst and the cocatalyst at 76℃ and under proper H2 pressure,was -d[c(C=C) ]/dt =kc1 (C=C )p1.12 (H2 )c1 (Ti )c-2 (DMP), and the activation energy of hydrogenation between 70~84℃ wad 83.48KT/mol.The structure of the products were also studied by 1H-NMR specta.The result indicated that 1,2-PB inits and trans-1,4 PB units were hydrogenated prior to cis-1,4-PB inits,and were fully hydrogenated.
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脚注
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