Homopolymerization of 4-vinyl pyridine(4-VP) and copolymerization of 4-VP with styrene(St) weir

performed by catalyst systems composed of calix [4] arene-neodymium complex 2

di-n-butylmagnesium and hexamethvl phasphoramide．The molecular weight of P(4-VP) was gready affected by adding calix[4] arene-neoaymium 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 copelymers with 4.85mol％～23.3mol％of 4-VP units were obtainod

but when 4-VP and styrene were added at the same time the resultant 4-VP-St copolymers had 44.0mol％～66．3mol％of 4-VP units．