【摘要】 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^-2Mw0.783 二氧六环:[η]=7.623×10^-3Mw0.820 环已酮[η]=1.157×10^-2Ww0.785 DMSO[η]=4.550×10^-2MW0.647 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。更多还原

【Abstract】 With GPC. [η] and Mw of the polydispersed sample, the monodispersed Mark-Houwik relation ships of the polyurethane based on polybutylene- adipate diol, 4, 4’-diphenylmethane diisocyanate （MDI） and 1, 4-butandiol （BDO） were established in five solvents at 25℃: DMF [η]=1.540×10^-2 Mw 0.748 THF [η]=1.211×10^-2 Mw 0.783 1, 4-dioxane [η]=7.623×10^-3 Mw 0.820 Cyclohexanone [η]=1.157×10^-2 Mw 0.785 DMSO [η]=4.550×10^-2 Mw 0.647 The calculated Mη according to these relationships is in keeping with the monodispersed Mark-Houwink relationships. It has nothing to do with the molecular weight distribution of the samples.更多还原