Determination of some kinetic constants in ethylene polymerization

被引：0
|
作者：
Kim, Myong-Hui [1 ]
Maeng, Tae-Won [1 ]
Sin, Kye-Ryong [1 ]
Pak, Chol-Man [1 ]
Kim, Ju-Gyong [1 ]
机构：
[1] Kim Il Sung Univ, Fac Chem, Pyongyang, South Korea
来源：
REACTION KINETICS MECHANISMS AND CATALYSIS | 2023年 / 136卷 / 5期
关键词：
Ethylene polymerization; Reaction kinetics; Deactivation; ACTIVE-CENTERS; PHILLIPS CATALYST; POLYETHYLENE; COMPLEXES; SINGLE; PHASE; MODEL; MECHANISM; FEATURES; REACTOR;
D O I：
10.1007/s11144-023-02457-1
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We have obtained ultra-high molecular weight polyethylene by using a MgCl2/Ti(OBu)4/SiCl4/PMS/TiCl4-based catalysts. We derived an equation that could calculate some kinetic constants, investigating the deactivation reaction mechanism in the polymerization process. The results indicate that the reaction proceeded with a bimolecular deactivation reaction mechanism for initial 20 min, and then monomolecular deactivation reaction mechanism. Knowing the molecular weight distribution values, we derived an equation that can calculate the concentration of active centers and some velocity constants and the average lifetime of the growth chain that are difficult to determine from the relationship between water average polymerization and time. Using MgCl2/Ti (OBu)4/SiCl4/PMS/TiCl4 based catalysts, the deactivation reaction mechanism was changed with time, indicating that the reaction proceeded with a bimolecular deactivation reaction mechanism for initial 20 min, and then monomolecular deactivation reaction mechanism.
引用
收藏
页码：2429 / 2439
页数：11
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