Pentamethylcyclopentadienyl) titanium triallyioxide[Cp *Ti(OCH 2-CH[CDS1]CH 2) 3] was used as the catalyst precursor for the synthesis of polybutene 1, methylalumiunoxane(MAO) as cocatalyst. The effects of the ratio o...Pentamethylcyclopentadienyl) titanium triallyioxide[Cp *Ti(OCH 2-CH[CDS1]CH 2) 3] was used as the catalyst precursor for the synthesis of polybutene 1, methylalumiunoxane(MAO) as cocatalyst. The effects of the ratio of n (Al) to n (Ti), polymerization temperature, and concentration of Ti on catalytic activity, molecular weight and chain structure were investigated in detail. The ether soluble fraction of the polybutene 1 was characterized with 13 C NMR, DSC, WAXD, and GPC. The results indicate that the polymers thus obtained are atactic and regioirregular, the weight average molecular weight of these polymers lies in the range of 3 0×10 5 to 7 0×10 5. Increasing the polymerization temperature can result in a decrease in the polymer molecular weight. But the molecular weight varies slightly with the ratio of n (Al) to n (Ti). The catalytic activity tends to decrease with the increase in polymerization temperature. was used as the catalyst precursor for the synthesis of polybutene 1, methylalumiunoxane(MAO) as cocatalyst. The effects of the ratio of n (Al) to n (Ti), polymerization temperature, and concentration of Ti on catalytic activity, molecular weight and chain structure were investigated in detail. The ether soluble fraction of the polybutene 1 was characterized with 13 C NMR, DSC, WAXD, and GPC. The results indicate that the polymers thus obtained are atactic and regioirregular, the weight average molecular weight of these polymers lies in the range of 3 0×10 5 to 7 0×10 5. Increasing the polymerization temperature can result in a decrease in the polymer molecular weight. But the molecular weight varies slightly with the ratio of n (Al) to n (Ti). The catalytic activity tends to decrease with the increase in polymerization temperature.展开更多
制备了新型综合性能优于间规聚苯乙烯 (s PS) /聚对苯二甲酸乙二醇酯 (PET)的 s PS/PET/磺化间规聚苯乙烯钾盐离聚体 (Ss PS- K)工程塑料合金。当 s PS/PET/Ss PS- K为 85 /15 /4时 ,合金的冲击强度最大为 11.5 k J/m2 ,是纯 s PS的 3...制备了新型综合性能优于间规聚苯乙烯 (s PS) /聚对苯二甲酸乙二醇酯 (PET)的 s PS/PET/磺化间规聚苯乙烯钾盐离聚体 (Ss PS- K)工程塑料合金。当 s PS/PET/Ss PS- K为 85 /15 /4时 ,合金的冲击强度最大为 11.5 k J/m2 ,是纯 s PS的 3倍 ,且拉伸强度和弯曲强度依旧较高 ,耐热性较好。DSC分析表明 s PS和PET的熔点几乎不受 Ss PS- K用量的影响 ,分别接近各自的纯料 ,而起始结晶温度和达到最大结晶速率时的温度均提高。另外 ,PET的结晶速率显著提高。SEM观察到加入 Ss PS- K后 ,PET分散相的尺寸减小 ,且随其用量的增加 。展开更多
文摘Pentamethylcyclopentadienyl) titanium triallyioxide[Cp *Ti(OCH 2-CH[CDS1]CH 2) 3] was used as the catalyst precursor for the synthesis of polybutene 1, methylalumiunoxane(MAO) as cocatalyst. The effects of the ratio of n (Al) to n (Ti), polymerization temperature, and concentration of Ti on catalytic activity, molecular weight and chain structure were investigated in detail. The ether soluble fraction of the polybutene 1 was characterized with 13 C NMR, DSC, WAXD, and GPC. The results indicate that the polymers thus obtained are atactic and regioirregular, the weight average molecular weight of these polymers lies in the range of 3 0×10 5 to 7 0×10 5. Increasing the polymerization temperature can result in a decrease in the polymer molecular weight. But the molecular weight varies slightly with the ratio of n (Al) to n (Ti). The catalytic activity tends to decrease with the increase in polymerization temperature. was used as the catalyst precursor for the synthesis of polybutene 1, methylalumiunoxane(MAO) as cocatalyst. The effects of the ratio of n (Al) to n (Ti), polymerization temperature, and concentration of Ti on catalytic activity, molecular weight and chain structure were investigated in detail. The ether soluble fraction of the polybutene 1 was characterized with 13 C NMR, DSC, WAXD, and GPC. The results indicate that the polymers thus obtained are atactic and regioirregular, the weight average molecular weight of these polymers lies in the range of 3 0×10 5 to 7 0×10 5. Increasing the polymerization temperature can result in a decrease in the polymer molecular weight. But the molecular weight varies slightly with the ratio of n (Al) to n (Ti). The catalytic activity tends to decrease with the increase in polymerization temperature.
