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以苯酚为溶剂,甲醇为沉淀剂将三个聚壬酰胺试样(??各为20400,12900和7100)分级沉淀.每一试样至少经过二次分级,共得到二十级份.取其中七个级份测定其数均分子量及特性粘数.粘度测定在25℃,溶剂用苯酚-乙酸(2∶1重量比).在分子量4300-20000内,得到下列特性粘数-分子量关系: [η]=7.52×10~(-3)M~(0.96)ml/g M=200[η]-360 苯酚-乙酸(2∶1重量比)混合溶剂容易纯化且不引起聚壬酰胺的降解,能溶解尼龙-6,66,7,9和11,可作聚酰胺粘度测定的普适溶剂.
Phenol as a solvent, methanol as a precipitating agent three polynonamide samples (?? each 20400,12900 and 7100) fractional precipitation of each sample at least after a second classification, a total of twenty parts take. Seven fractions were tested for number average molecular weight and intrinsic viscosity Viscosity determination The following intrinsic viscosities were obtained at a molecular weight of 4300-20000 at 25 ° C using phenol-acetic acid (2: 1 weight ratio): [ η = 7.52 × 10 -3 M ~ 0.96 ml / g M = 200 [η] -360 Phenol-acetic acid (2: 1 weight ratio) The mixed solvent is easily purified and does not cause degradation of polynonanamide, Nylon-6, 66, 7, 9, and 11 can be dissolved and can be used as a universal solvent for polyamide viscosity measurement.