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本工作研究了几种不同分子量聚酰胺1010试样的熔体粘度。温度范围是215—275℃。利用Bagley方法证明末端改正可以略去不计。在实验范围内,聚酰胺1010 熔体是牛顿流体,因此得到的结果是熔体的真实零粘度。熔体粘度和分子量的关系可以表示为:logη_m=0.022〈M_n>~(1/2)+常数(T)。作者认为不用数均分子量而用聚酰胺1010在96%硫酸溶液中的特性粘数更适宜于表征试样的分子量与熔体粘度的关系,即logη_m=0.025[η]+常数(T)。除了[η]=85.5试样的活化能有微弱的温度依赖性以外,其余较小分子量试样的活化能都是常数。试样的[η]为55、71.6、85.5时其活化能分别为10.5、12.8及14.2千卡/克分子。综合了η_m-[η]-T数据得到经验方程: logη_m=1/T(24.6[η]+944)-(0.0209[η]+0.853)在本实验范围内误差小于6%。
This work studied the melt viscosities of several polyamide 1010 samples of different molecular weights. The temperature range is 215-275 ° C. Use the Bagley method to prove that the end correction can be ignored. In the experimental context, the polyamide 1010 melt is a Newtonian fluid, so the result is a true zero viscosity of the melt. The relationship between melt viscosity and molecular weight can be expressed as: logη_m = 0.022 ~ (1/2) + constant (T). The author considers that the intrinsic viscosity of polyamide 1010 in 96% sulfuric acid solution without using number average molecular weight is more suitable for characterizing the relationship between molecular weight and melt viscosity of sample, ie, logη_m = 0.025 [η] + constant (T). Except for [η] = 85.5, the activation energy of the sample has a weak temperature dependence, and the activation energies of the remaining smaller molecular weight samples are all constant. The [η] of the samples was 55, 71.6 and 85.5, respectively, and their activation energies were 10.5, 12.8 and 14.2 kcal / mol, respectively. The empirical equation is obtained by combining η_m- [η] -T data: logη_m = 1 / T (24.6 [η] +944) - (0.0209 [η] +0.853) The error within this experimental range is less than 6%.