摘要
A novel poly(1\|butene) was synthesized with η 5 \|pentamethylcyclopentadienyl\|tribenzyloxytitanium(Cp\+*Ti(OBz)\-3) and modified methylaluminoxane(MAO). The influence of various conditions (e.g., catalyst composition, temperature, Al/Ti, pressure of monomer, and catalyst concentration) on the catalytic activity, molecular weight of the products were investigated in detail. It was found that the catalyst exhibited highest activity of 91 3kgPB/molTi·h at \%T\%=30℃, and Al/Ti(mol/mol)=200. The catalytic activity and molecular weight were sensitive to the TMA content in MAO and external TIBA. Catalytiac activity and molecular weight were decreased with increasing the content of TMA in MAO.External addition of TIBA can deactivated the catalyst. Molecular weight of the products was increased with decreasing temperature and Ti concentration. The catalyst had the highest activity at a Ti concentration of 1 0×10 -3 mol/L. The molecular weight of poly(1\|butene) is high, over one million by GPC method. The results showed that with this catalyst system, a high molecular weight poly(1\|butene) can be synthesized.
A novel poly(1\|butene) was synthesized with η 5 \|pentamethylcyclopentadienyl\|tribenzyloxytitanium(Cp\+*Ti(OBz)\-3) and modified methylaluminoxane(MAO). The influence of various conditions (e.g., catalyst composition, temperature, Al/Ti, pressure of monomer, and catalyst concentration) on the catalytic activity, molecular weight of the products were investigated in detail. It was found that the catalyst exhibited highest activity of 91 3kgPB/molTi·h at \%T\%=30℃, and Al/Ti(mol/mol)=200. The catalytic activity and molecular weight were sensitive to the TMA content in MAO and external TIBA. Catalytiac activity and molecular weight were decreased with increasing the content of TMA in MAO.External addition of TIBA can deactivated the catalyst. Molecular weight of the products was increased with decreasing temperature and Ti concentration. The catalyst had the highest activity at a Ti concentration of 1 0×10 -3 mol/L. The molecular weight of poly(1\|butene) is high, over one million by GPC method. The results showed that with this catalyst system, a high molecular weight poly(1\|butene) can be synthesized.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2000年第4期489-491,共3页
Acta Polymerica Sinica
基金
国家自然科学基金!资助项目 (基金号 2 963 4 0 10 )
