摘要
双烷基钪配合物LSc(CH2SiMe3)2(L=(2,6-iPr2C6H3)NC(Me)CHPPh2N(2,6-Me2C6H3))在助催化剂[Ph3C][B(C6F5)4]的作用下能够高活性地催化乙烯和丙烯共聚.在反应温度30℃和乙烯与丙烯常压(1.0×105Pa)下聚合,共聚活性能够达到7.5×105g(PE)mol-1h-1(105Pa)-1.单体的竞聚率分别为rE=29.75和rP=0.015.13C-NMR和DSC分析表明所得到的乙丙共聚物是弹性体,且丙烯单体无规分布在共聚物链中.
The scandium dialkyl complex LSc（CH2SiMea）2（L = （2,6-iPr2C6H3）NC（Me）CHPPh2N-（2,6- Me2C6H3 ） ） activated with [ Ph3C] [ B（ C6F5 ）, ] could initiate ethylene and propylene copolymerization with high activity （7.5×105g（PE）mo1-1 h-1（10SPa） -1） under the conditions of room temperature （30 ℃ ） and atomphere pressure （ 1.0 × 105 Pa）. The influence of comonomer feed content and polymerization temperature on activity and the composition of the copolymers using LSc （ CH2 SiMe3 ） 2/[ Ph3 C ] [ B （ C6 F5 ） 4 3 catalytic system were investigated. An increase in the initial propylene feed content leads to the increase in the incorporated propylene content of the resulting copolymer. At 30 ℃ , the highest activity and incorporation of propylene were achieved. Determination of the reactivity ratios shows a much high reactivity for ethylene （rE = 29.75 and rp = 0. 015 ）. The resultant copolymers are elastomers having random sequence distibution of the two monomeric units evidenced by 13C-NMR spectroscopy and DSC analyses.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2013年第5期649-653,共5页
Acta Polymerica Sinica
基金
国家自然科学基金青年基金(基金号21104072)资助项目
关键词
稀土配合物
乙烯
丙烯
共聚合
Rare earth metal complex, Ethylene, Propylene, Copolymerization
