Controlling external diphenylcyclohexylphosphine feeding to achieve cis-1,4-syn-1,2 sequence controlled polybutadienes via cobalt catalyzed 1,3-butadiene polymerization
作者:Dirong Gong、Weilun Ying、Junyi Zhao、Wenxin Li、Yuechao Xu、Yunjie Luo、Xuequan Zhang、Carmine Capacchione、Alfonso Grassi
DOI:10.1016/j.jcat.2019.07.025
日期:2019.9
materials. In this contribution, we have reported the syntheses, characterization of 6-(di-tert-butyl-phosphine) amine fused 2-R-pyridine compounds (R = 1′H-oxazoline (L1); 4′,4′-dimethyl oxazoline (L2); 4′-isopropyl oxazoline (L3) supported cobalt dichloride complexes and their performances in regio-selectivity, sequence and molecular weight controlled polymerization of butadiene. In combination with
微观结构和单元顺序是决定聚丁二烯材料性能的关键参数。在此贡献中,我们报道了合成,6-(二-叔丁基膦)的表征胺稠2-R-吡啶化合物(R = 1' ħ恶唑(L1); 4',4'-二甲基恶唑啉(L2); 4'-异丙基恶唑啉(L3)负载的二氯化钴配合物及其在丁二烯的区域选择性,序列和分子量控制的聚合反应中的性能。与MMAO组合,钴介导的聚合反应显示了许多活的特性与顺-1,4聚合系统在0–80°C的宽温度范围内。我们表明,可以在152–164 kg / mol的范围内调整数均分子量,而MWD值在1.04–1.34的范围内。催化剂上的空间体积对聚合速率有不利影响(k obs(Co1,无 取代基)为0.037 L / mol·min。> K obs(Co3,异丙基)为0.030 L / mol·min。> K obs (Co 2,二甲基)至0.024L / mol·min。以二苯基环己基膦(Ph 2 C