摘要
以蒽基取代的含酚单茂催化剂为主催化剂,三苯甲基四(五氟苯基)硼酸盐为助催化剂进行了乙烯均聚和乙烯/α-烯烃共聚反应,利用DSC,GPC等方法考察了该催化体系在不同聚合条件下的聚合性能。实验结果表明,该催化体系催化乙烯均聚的活性最高可达到3.36×10^(6)g/(mol·h)。适宜的聚合条件为:催化剂用量10μmol,n(Al)∶n(Ti)=150,n(B)∶n(Ti)=1.5,反应温度20℃,反应压力0.4 MPa,聚合时间10 min,液体总体积200 mL。在该条件下还可催化乙烯与α-烯烃共聚,其中,与1-辛烯共聚时,聚合活性最高可达2.00×10^(6)g/(mol·h),共聚物密度在0.859~0.876 g/cm3之间,玻璃化转变温度均低于-52℃,符合乙烯共聚弹性体的结构性能特征,且通过调节共聚单体浓度能有效控制乙烯共聚物链结构。
Ethylene homopolymerization and ethylene/α-olefin copolymerization were carried out using anthracene substituted phenol-containing monocene catalyst as the main catalyst,and triphenylcarborunium tetra(pentafluorophenyl)borate as the cocatalyst.The polymerization performance of the catalytic system under different polymerization conditions was examined with such methods as DSC and GPC.The experimental results show that the catalytic activity of the catalytic system for ethylene homopolymerization can reach up to 3.36×10^(6)g/(mol·h).Appropriate polymerization conditions are stated as follows:catalyst dosage of 10μmol,n(Al)∶n(Ti)=150,n(B)∶n(Ti)=1.5,reaction temperature of 20℃,reaction pressure of 0.4 MPa,polymerization time of 10 min,total liquid volume of 200 mL.It is also applicable to catalyze ethylene andα-olefin copolymerization under such conditions.Wherein,polymerization activity can reach 2.00×10^(6)g/(mol·h)when copolymerized with l-octene,and the copolymer density is between 0.859-0.876 g/cm3.Furthermore,the glass transition temperature is below-52℃.All these are consistent with the structural and performance characteristics of ethylene copolymer elastomers.Moreover,adjustment to the concentration of copolymer monomers is favorable for effective control of the chain structure of ethylene copolymers.
作者
郭钦生
韩书亮
宋文波
董泽
GUO Qinsheng;HAN Shuliang;SONG Wenbo;DONG Ze(Sinopec Maoming Petrochemical Company,Maoming 525021,China;Sinopec(Beijing)Institute of Chemical Industry Co.,Ltd.,Beijing 100013,China)
出处
《石油化工》
CAS
CSCD
北大核心
2024年第6期802-809,共8页
Petrochemical Technology
关键词
单茂金属配合物
苯酚配体
乙烯聚合
乙烯共聚物
聚烯烃弹性体
monocene metal complex
phenol ligand
ethylene polymerization
ethylene copolymer
polyolefin elastomer
