The results obtained recently by the authors during investigation of the phase behavior of polymer solutions under uniaxial tension are reviewed. The main attention is given to the dilute solutions of unentangled semiflexible macromolecules. The effect of the solution extension rate on the coil–stretched coil transition for semiflexible chains is considered, and stability of the system of stretched coils is analyzed in terms of their segregation followed by formation of the concentrated polymer phase. The spinodal and binodal of the system are determined depending on temperature and extension rate. The kinetics of solution segregation to polymer and solvent, where three stages, namely, (i) spinodal decomposition accompanied by the formation of regions with increased and reduced polymer contents, (ii) formation of the microfibrillar network, and (iii) network collapse yielding separation of the solvent from the polymer phase are identified, is described.

作者最近综述了在单轴张力下研究聚合物溶液的相行为时获得的结果。主要关注未缠结的半柔性大分子的稀溶液。考虑了溶液扩展速率对半挠性链的卷曲-拉伸卷曲转变的影响，并根据其分离和随后形成浓缩聚合物相的角度分析了拉伸卷曲系统的稳定性。系统的旋节线和双节线取决于温度和延伸率。溶液分离为聚合物和溶剂的动力学，分为三个阶段，即（i）旋节线分解，伴随着聚合物含量增加和减少的区域的形成，（ii）微原纤维网络的形成，