论文部分内容阅读
用乌式毛细管粘度计对硝化纤维素稀溶液的粘度行为进行了研究，测定了原溶液、冰冻后溶液、冰冻后经过加热的溶液以及加热后继续冰冻溶液相对粘度的变化规律。结果表明：冰冻过程中硝化纤维素溶液粘度的降低是由于分子链内发生链内凝聚（缠结）造成的。并且发现，不同浓度的高分子溶液冰冻过程中相对粘度变化的规律不相同，浓度较高的硝化纤维素溶液在冰冻过程的初期可能同时伴随有链内凝聚和链间凝聚。文中还讨论了一种快速形成链内凝聚的方法，并对冰冻过程中硝化纤维素分子形成链内交联点的倍数进行了估计。
The viscometric behavior of the nitrocellulose diluted solution was studied by means of a U-tube capillary viscometer. The changes of the relative viscosity of the original solution, the solution after freezing, the solution after the freezing and the solution after heating were measured. The results show that the decrease of the viscosity of the nitrocellulose solution in the freezing process is caused by the in-chain cohesion (entanglement) in the molecular chain. And found that different concentrations of polymer solution during the freezing process of the relative viscosity changes are not the same, higher concentrations of nitrocellulose solution in the early stages of the freezing process may be accompanied by intra-chain condensation and inter-chain aggregation. In the paper, a method of rapid formation of intra-chain agglomeration is also discussed, and the multiple of the cross-linking point of the formation of nitrocellulose molecules during the freezing process is estimated.