摘要
以α－甲基萘锂（α－ＭＮＬｉ）为引发剂、二哌啶乙烷（ＤＰＥ）为调节剂、环己烷为溶剂的丁二烯负离子聚合体系，研究了ＤＰＥ／α－ＭＮｌｉ、聚合温度与聚合物１，２－结构含量关系，合成出１，２一结构近１００％的１，２－聚丁二烯（１，２－ＰＢ）和１，２－１，４－１，２－ＰＢ。反应动力学研究表明：１，４－ＰＢ与１，２－ＰＢ中单体浓度与反应速率呈一级方程关系；４０℃时，生成１，４－ＰＢ的反应动力学方程式为－ｄ［Ｍ］／ｄｔ＝０．２８［Ｃ］￣０．５［Ｍ］；ＤＰＥ用量增大，表观增长反应过度常数Ｋ＿ｐ￣η减小；求得不同条件下的表观增长活化能。
The effect of modifier and temperature on the 1,2-content of polybutadiene and the relationship between polymerization condition and conversion was studied with lithium α-methyl naphthalene(α-MNLi) as initiator, dipiperidinoethane(DPE) as modifier and cyclohexane as solvent.The stereotriblock polybutadiene with different molecular weight and block ratios were synthesized.The total reaction rate of butadiene with α-MNLi initiate system was measured by the equation:-d[M]/dt=0.28[α-MNLi]￣0.5[M],when the temperature was 40℃. The apparentrate constant and apparent active energy at different conditions were also measured.
出处
《合成橡胶工业》
CSCD
北大核心
1995年第5期290-293,共4页
China Synthetic Rubber Industry
基金
国家自然科学基金
关键词
三嵌段聚合物
动力学
聚丁二烯橡胶
PB
polybutadiene
1
2-polybutadiene
microstructure
stereotriblock polymer
polymerization kinetics
