摘要
A new supported catalytic system of Cp Zr Cl2/ B F3/ Al2 O3 for ethylenepolymerization was prepared . The preparation conditions such as pretreatment temperature ,reaction time and the concentration of added B F3 were investigated . It was found that thechemicalreaction and physical adsorption occurred between B Fand Al2 O3 . Their frequencywas dependent on the O Hconcentration at Al2 O3 surfaces. Ahigher polymerization activity106 ～107g P E/mol Zr·h was obtained by using the resultantsupported catalysteven atlower[ Al]/[ Zr] ratios.
A new supported catalytic system of Cp Zr Cl2/ B F3/ Al2 O3 for ethylenepolymerization was prepared . The preparation conditions such as pretreatment temperature ,reaction time and the concentration of added B F3 were investigated . It was found that thechemicalreaction and physical adsorption occurred between B Fand Al2 O3 . Their frequencywas dependent on the O Hconcentration at Al2 O3 surfaces. Ahigher polymerization activity106 ～107g P E/mol Zr·h was obtained by using the resultantsupported catalysteven atlower[ Al]/[ Zr] ratios.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1999年第5期631-633,共3页
Acta Polymerica Sinica
基金
国家自然科学基金
教育部留学回国人员科研启动基金
关键词
茂金属
负载型
催化剂
载体
乙烯聚合
聚乙烯
Metallocene , Supported catalyst, Modified Al2 O3 , Ethylene polymerization
