摘要
Calix[8]arene neodymium was prepared by reacting calix[8]arene with metallic sodium in a mixture of benzene and isopropanol, then with anhydrous neodymium chloride. Calix[8]arene neodymium in combination with Al( i Bu) 3 as a cocatalyst was active in the polymerization of ethylene. Effects of Al/Nd molar ratio, concentration of catalyst and temperature on the ethylene polymerization were studied in detail. Polyethylene having M v of 97×10 4 was obtained under the following conditions: [Nd]=8×10 -4 mol/L, the molar ratio of Al to Nd=15, 80 ℃, 0.5 h; ethylene pressure=1.2 MPa, and the catalytic activity is 24 kg PE/(mol Nd·h) .
Calix[8]arene neodymium was prepared by reacting calix[8]arene with metallic sodium in a mixture of benzene and isopropanol, then with anhydrous neodymium chloride. Calix[8]arene neodymium in combination with Al( i Bu) 3 as a cocatalyst was active in the polymerization of ethylene. Effects of Al/Nd molar ratio, concentration of catalyst and temperature on the ethylene polymerization were studied in detail. Polyethylene having M v of 97×10 4 was obtained under the following conditions: [Nd]=8×10 -4 mol/L, the molar ratio of Al to Nd=15, 80 ℃, 0.5 h; ethylene pressure=1.2 MPa, and the catalytic activity is 24 kg PE/(mol Nd·h) .
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第12期1982-1984,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金-北京燕山石化公司研究院联合项目!(批准号:29844002)
浙江省自然科学基金!(批准号:298024)
波谱与原子物理国家重
关键词
杯芳烃
钕
稀土催化剂
聚合
乙烯
聚乙烯
Calix[8]arene, Rare earth catalyst, Polymerization of ethylene
