ポリビニルピロリドン水溶液の光散乱

概要

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Molecular weight, M, of fractionated poly (vinylpyrrolidone)(PVP) was determined by the light scattering method at 436 nm. The relationship between M and intrinsic viscosity, [η], measured at 25°, was found to be [η]=5.75×10^<-4>M^<0.60>(10^5≦M≦10^6) and [η]=0.134M^<0.19> (10^6≦M≦10^7). It was suggested that the reason why the power for M becomes smaller when the M is higher than 10^6 is that there occurs a branching on PVP molecule with a high degree polymerization. The dimension of PVP coil calculated from the intrinsic viscosity and the radius of gyration is about three times the dimension of it ideal Gaussian coil assuming the bond angle of hydrocarbon chain. It was concluded from the relationship between [η] and M of PVP and poly (vinyl alcohol)(PVA) that the size of polymer coil of PVP and PVA is almost the same when the degree of polymerization of both polymers is in the range of 800 to 4000. It was found that the second virial coefficient, A_2,of PVP is proportional to M^<-0.307>.
公益社団法人日本薬学会の論文
1976-06-25