杯芳烃钕/二正丁基镁/六甲基磷酰胺催化4-乙烯基吡啶的均聚及其与苯乙烯的共聚

HOMOPOLYMERIZATION OF 4-VINYLPYRIDINE AND COPOLYMERIZATION OF 4-VINYLPYRIDINE WITH STYRENE BY CALIX[4] ARENE-NEODYMIUM CATALYST

Homopolymerization of 4-vinyl pyridine（4-VP） and copolymerization of 4-VP with styrene（St） were performed by catalyst systems composed of calix[4]arene-neodymium complex 2,di-n-butylmagnesium and hexamethyl phosphoramide. The molecular weight of P（4-VP） was greatly affected by adding calix[4]arene-neodymium complex,and high molecular weight of P（4-VP） was got by using calix[4]arene-neodymium complex.The highest molecular weight of P（4-VP） was as high as 4.65×106 obtained by using a catalyst system with 2.0×10-4?mol/L of calix[4]arene-neodymium complex,while the molecular weight of P（4-VP） was only 5.62×105 without calix[4]arene-neodymium complex. In addition,4-VP-St copolymers with different 4-VP contents were obtained in good yield.When styrene was polymerized first for a time period,and then 4-VP was added,4-VP-St copolymers with 4.85?mol%～23.3?mol% of 4-VP units were obtained,but when 4-VP and styrene were added at the same time the resultant 4-VP-St copolymers had 44.0?mol%～66.3?mol% of 4-VP units.

Homopolymerization of 4-vinyl pyridine （4-VP） and copolymerization of 4-VP with styrene （St） were performed by catalyst systems composed of calix [ 4 ] arene-neodymium complex 2, di-n-butylmagnesium and hexamethyl phosphoramide. The molecular weight of P（4-VP） was greatly affected by adding calix [4] areneneodymium complex, and high molecular weight of P（4-VP） was got by using calix [4] arene-neodymium complex. The highest molecular weight of P（4-VP） was as high as 4.65 x 106 obtained by using a catalyst system with 2.0×10^-4 mol/L of calix[4] arene-neodymium complex, while the molecular weight of P（4-VP） was only 5.62×10^5 without calix [4] arene-neodymium complex. In addition, 4-VP-St copolymers with different 4-VP contents were obtained in good yield. When styrene was polymerized first for a time period, and then 4-VP was added, 4-VP-St copolymers with 4.85mol%～23.3 tool% of 4-VP units were obtained, but when 4-VP and styrene were added at the same time the resultant 4-VP-St copolymers had 44.0 mol%～66.3 mol% of 4-VP units.