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采用逐步沉淀分级的方法将高含量1,2—聚丁二烯试样分级,利用小角激光光散射法,粘度法分别测定各级分的重均分子量M_W及特性粘数[η],通过凝胶渗透色谱仪选出四个级分,分别用最小二乘法和作图法订定了高1,2—聚丁二烯在四氢呋喃、甲苯中的Mark—Houwink方程中的K、α值,同时订定出第二维利系数A_2。用本实验结果由凝胶渗透色谱法计算各级分的分子量值与实测重均分子量M_W大致相符,证实该方程是可信的。实验结果:[η]_(THF)~(30℃)=2.2620×10~(-2)M~(0.7379) [η]_(甲苯)~(30℃)=4.5447×10~(-2)~(0.7204)
The samples with high content of 1,2-polybutadiene were classified by stepwise precipitation classification. The weight average molecular weight M_W and intrinsic viscosity [η] of each fraction were determined by small angle laser light scattering and viscosity respectively. The gel permeation chromatograph selected four fractions and determined the K and α values of the Mark-Houwink equation of high 1,2-polybutadiene in tetrahydrofuran and toluene using the least squares method and the plotting method respectively Set a second Vaili coefficient A_2. The results of this experiment by gel permeation chromatography to calculate the molecular weight of each fraction and the measured weight average molecular weight M_W roughly consistent, confirmed that the equation is credible. The results of the experiment are as follows: [η] _ (THF) ~ (30 ℃) = 2.2620 × 10 -2 M ~ 0.7379 η = toluene ~ 30 ℃ = 4.5447 × 10 -2 ~ (0.7204)