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研究了进口TMC体系用于合成反式-1,4-聚异戊二烯(TPI)的聚合活性及其动力学行为。结果表明,以三异丁基铝为助催化剂,催化剂效率(CE)随着单体浓度加大,聚合温度上升和聚合时间延长而提高。当采用溶剂→单体→Al→Ti为加料顺序,以甲苯为溶剂,在Al/Ti=50(mol/mol),Tp=60℃时的最大催化剂效率可达4000~5000gTPI/gTi。初步动力学研究表明,聚合反应速率对单体浓度呈一级反应,聚合表观活化能为33kJ/mol。
The polymerization activity and kinetic behavior of TMC system for the synthesis of trans-1,4-polyisoprene (TPI) were studied. The results show that with triisobutylaluminum as cocatalyst, the catalyst efficiency (CE) increases with the increase of the monomer concentration, the polymerization temperature and the polymerization time. When the solvent → monomer → Al → Ti is the order of addition, the maximum catalyst efficiency of 4000-5000 gTPI / gTi can be achieved with Al / Ti = 50 (mol / mol) and Tp = 60 ℃ with toluene as solvent. Preliminary kinetic studies have shown that the polymerization rate of the monomer concentration was a first-order reaction, the apparent activation energy of polymerization was 33kJ / mol.