共查询到16条相似文献,搜索用时 62 毫秒
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对n-C8H17OH-BF·OEt2(B)预混、CH3COOC4H9-B预混和稀B单加三种体系的聚合行为进行了比较。结果表明,当B组分中加入n-C8H17OH时,可有效地提高聚丁二烯的相对分子质量;而加入CH3COOC4H9,可在不影响聚合物相对分子质量的前提下拓宽Al/B值。 相似文献
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镍催化体系丁二烯溶液聚合行为 总被引:3,自引:1,他引:2
以镍系催化丁二烯溶液聚合制得顺式-1,4-聚丁二烯的小试及工业生产为基础,对丁二烯溶液聚合的宏观动力学行为及工业生产中出现的问题进行了研究。结果表明,当单体转化率大于30%时,聚合偏离动力学一级反应;终止釜胶样辊压干燥是导致门尼值升高的主要原因。 相似文献
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采用向聚合体系中添加水/加氢汽油乳液的方法研究了水对镍系催化丁二烯聚合活性,聚合物分子量和体系相态等的影响。结果表明,在不同环烷基铝与三氟化硼仳修理地添加适量水。加氢汽油乳液均可使矣合诱导期缩短,反应速度加快。 相似文献
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本文研究了Ni(naph)2Al(iBu)3-BF3·OEt2+ROH新型镍系催化体系催化丁二烯的聚合动力学,考察了该体系的动力学曲线、速度方程、聚合度,测定了催化剂利用率、活性中心浓度等动力学参数。聚合速率对单体浓度呈一级关系,表观活化能为40.4kJ/mol,催化剂利用率约为10%。 相似文献
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研究了Ni(naph)2-Al(i-Bu)3-(BF3.OEt2+ROH0体系催化丁二烯聚合的特点,考查了ROH/B摩尔比,Al/Ni摩尔比,Ni/Bd摩尔比等反应条件对聚合活性及聚合产物分子量的影响。 相似文献
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A bench-scale batch reactor was used to study the polymerization of butadiene with nickel(II) stearate Et2AlCl catalyst. In particular, the effects of moisture on polymerization were investigated. The initiation reaction is sensitive to temperature. At 0°C an induction period was observed, but at room temperature initiation can be assumed instantaneous. Water enhances catalytic reactivity, however at water concentrations greater than 10 mmol/L, termination reactions become significant. Maximum conversion is obtained in the 6 to 15 mmol/L range of water. The determining step for the molecular weight of polymer is the chain transfer to monomer. At low H2O concentration the molecular weight increases with water concentration, however it becomes independent of water concentration at high moisture content. With the help of statistical analysis of the experimental data, a two-active-species model was developed to describe the kinetics of the system and to explain certain polymerization characteristics. 相似文献
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考察了在以MoO2Br2为主催化剂,Al(i-Bu)2OPhCH3为助催化剂的体系中添加第三组分氯硅烷系列组成的Al-Mo-Cl催化体系引发丁二烯的聚合。结果表明在适量氯硅烷范围内,随Cl/Mo上升,催化活性有所提高,聚合物分子量显著下降,但分子量分布以及1,2-链节含量变化较小。讨论了氯硅烷的作用 相似文献