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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >Rheological behavior of dope solutions of poly(acrylonitrile-co-itaconic acid) in N,N-dimethylformamide: Effect of polymer molar mass
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Rheological behavior of dope solutions of poly(acrylonitrile-co-itaconic acid) in N,N-dimethylformamide: Effect of polymer molar mass

机译：N，N-二甲基甲酰胺中聚丙烯腈-衣康酸的浓液的流变行为：聚合物摩尔质量的影响

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摘要

The rheological behavior of dope solutions of poly(acrylonitrile-co-itaconic acid) or poly(AN-co-IA) is important from the point of view of deriving the spinning conditions for good quality special acrylic fibers. The viscosity of the resin dope is dictated by the polymer concentration, molar mass, temperature and shear force. The dynamic shear rheology of concentrated poly(AN-co-IA) polymer dope solutions in N,N-dimethylformamide, in the molar mass ((M) over bar (v)) range of 1 x 10(5) to 1 x 10(6) g/mol, was investigated in the shear rate (gamma') range of 1 x 10(1) to 5 x 10(4) min(-1). An empirical relation between eta and (M) over bar (v) was found to exist at constant shear rate. The dope viscosity was dependent on the molar mass and the shear rate at a given temperature (T) and concentration. The polymer molar mass index of dope viscosity (m) was calculated as functions of concentration (c), shear rate and temperature. The m values increased with shear rate and temperature. A master equation relating m, with shear rate and temperature was derived for a given dope concentration. At higher shear rates, m tends to the value of 3.4, which is close to the molar mass index of viscosity reported for molten thermoplastics. m increased significantly with shear rate and nominally with temperature, while an increase in concentration decreased it. The onset of shear thinning of the dope shifted to a lower shear rate regime with an increase in polymer concentration and the molar mass. For a given value of molar mass, the increase in viscosity of the dope solution with polymer concentration was dependent on the shear rate.
机译：从获得高质量的特种丙烯酸纤维的纺丝条件出发，聚（丙烯腈-衣康酸）或聚（AN-co-IA）浓液的流变行为很重要。树脂涂料的粘度由聚合物浓度，摩尔质量，温度和剪切力决定。浓聚（AN-co-IA）聚合物浓液在N，N-二甲基甲酰胺中的动态剪切流变学，摩尔质量（（M）over bar（v））在1 x 10（5）至1 x 10的范围内（6）g / mol，在1 x 10（1）到5 x 10（4）min（-1）的剪切速率（gamma'）范围内进行了研究。发现在恒定的剪切速率下，η和（M）在钢筋（v）上存在经验关系。涂料粘度取决于摩尔质量和在给定温度（T）下的剪切速率和浓度。计算浓液粘度的聚合物摩尔质量指数（m），作为浓度（c），剪切速率和温度的函数。 m值随剪切速率和温度而增加。对于给定的浓液浓度，得出了一个与剪切速率和温度相关的m的主方程。在较高的剪切速率下，m趋于值为3.4，接近于熔融热塑性塑料所报告的粘度摩尔质量指数。 m随剪切速率显着增加，名义上随温度增加，而浓度增加则减小。随着聚合物浓度和摩尔质量的增加，涂料的剪切稀化开始转移到较低的剪切速率状态。对于给定的摩尔质量值，涂料溶液的粘度随聚合物浓度的增加取决于剪切速率。

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