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通过光化法合成端羟基聚异戊二烯 (HTPI) ,考察了溶剂的种类、聚合反应时间、引发剂过氧化氢用量、单体浓度、光敏剂种类及用量等因素对聚合物的相对分子质量、分子量分布、平均官能度及转化率的影响。实验表明 ,光化法合成HTPI较合适的反应条件为 :用乙醇作溶剂 ,过氧化氢质量体积浓度 30～ 50g/L ,单体浓度 3.5～ 4 .0mol/L ,温度 ( 30± 2 )℃、反应时间 11h。产物的相对分子质量可达 950～ 10 0 0 ,分子量分布分散系数约为 1.2 ,平均官能度为 2 .0左右。添加光敏剂可提高单体转化率 ,浓度以 0 .3mol/L为宜。转化率最高可达 75%。
The hydroxyl group-terminated polyisoprene (HTPI) was synthesized by photochemical method. The influences of the type of solvent, the polymerization time, the amount of hydrogen peroxide used, the monomer concentration, the type and amount of photosensitizer on the relative molecular weight Quality, molecular weight distribution, average functionality and conversion rate. Experiments show that the photochemical synthesis of HTPI more appropriate reaction conditions: ethanol as solvent, the mass concentration of hydrogen peroxide 30 ~ 50g / L, monomer concentration of 3.5 ~ 4.0mol / L, temperature (30 ± 2) ℃ , Reaction time 11h. The relative molecular mass of the product can reach 950-1000, the molecular weight distribution dispersion coefficient is about 1.2, and the average functionality is about 2.0. Add photosensitizer can improve the monomer conversion, the concentration of 0. 3mol / L is appropriate. Conversion rates up to 75%.