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本文采用特性粘数[η],重均分子量Mw和GPC,以宽分布的高聚物试样得到单分散的粘度—分子量关系式的方法,建立了由聚已二酸丁二醇酯(Mn=1750),4,4′—二苯基甲烷二异氰酸酯(MDI)和扩链剂1,4—丁二醇(BDO)形成的低硬含量聚氨酯在25℃时五种溶剂中的单分散Mark—Houwink关系式: DMF[η]=1.540×10~(-2) Mw0.748 THF[η]=1.211×10~(-2)Mw0.783 二氧六环:[η]=7.623×10~(-3)Mw0.820 环已酮[η]=1.157×10~(-2)Ww0.785 DMSO[η]=4.550×10~(-2)MW0.647 按照上述式子计算得到的Mη与单分散的Mark—Houwink关系式相吻合,而与试样的分布宽度无关。
In this paper, a method of obtaining the monodisperse viscosity-molecular weight relationship with a wide range of polymer samples by means of intrinsic viscosity [η], weight average molecular weight Mw and GPC was established, and the polybutylene succinate = 1750), monodisperse Mark in five solvents at 25 ° C for low-hard-content polyurethanes formed from 4,4’-diphenylmethane diisocyanate (MDI) and chain extender 1,4-butanediol (BDO) -Houwink: DMF [η] = 1.540 × 10 -2 Mw0.748 THF [η] = 1.211 × 10 -2 Mw0.783 Dioxane: [η] = 7.623 × 10 ~ (-3) Mw0.820 Cyclohexanone [η] = 1.157 × 10 -2 Ww0.785 DMSO [η] = 4.550 × 10 -2 MW0.647 The calculated Mη and The monodisperse Mark-Houwink equation is consistent with the distribution width of the sample.