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在浓硫酸或稀硫酸中聚合得到了高分子量P2VP,~(13)C-NMR谱确定其为无规聚合物。特性粘数(切变速度D=0)与分子量之间的关系为[η]_(D=0)=1.27×10~(-2)(?)_W~(0.70)(在DMF中,25℃,(?)_W=2.66×10~6—10.0×10~6)。在DMF中,25℃,不依赖于切变速度的最大特性粘数为260毫升·克~(-1),相应的分子量M_η=1.74×10~6左右。无扰尺寸(_0/M)=6.08×10~(-18)厘米~2·克~(-1),在DMF 中B参数为1.91×10~(-27)厘米~3。
High-molecular-weight P2VP was obtained by polymerization in concentrated sulfuric acid or dilute sulfuric acid. The 13 C-NMR spectrum was confirmed to be a random polymer. The relationship between the intrinsic viscosity (shear rate D = 0) and the molecular weight is [η] _ (D = 0) = 1.27 × 10 -2 (?) _W ~ (0.70) ℃, (?) _W = 2.66 × 10 ~ 6-10.0 × 10 ~ 6). In DMF, the maximum intrinsic viscosity at 25 ℃, independent of the shear rate, was 260 ml · g -1, and the corresponding molecular weight was about M_η = 1.74 × 10 ~ 6. The results showed that the B parameters in the DMF ranged from 1.91 × 10 ~ (-27) cm ~ 3 to 6.08 × 10 ~ (-18) cm ~ 2 · g ~ .