Fortelný Ivan, Jůza Josef
Institute of Macromolecular Chemistry of the Czech Academy of Sciences, Heyrovského náměstí 2, CZ 162 06 Praha 6, Czech Republic.
Polymers (Basel). 2019 Apr 30;11(5):761. doi: 10.3390/polym11050761.
Control of the phase structure evolution in flowing immiscible polymer blends during their mixing and processing is fundamental for tailoring of their performance. This review summarizes present state of understanding and predictability of the phase structure evolution in flowing immiscible polymer blends with dispersed structure. Results of the studies of the droplet breakup in flow, important for determination of the droplet breakup frequency and of the size distribution of the daughter droplets, are reviewed. Theories of the flow-induced coalescence providing equations for collision efficiency are discussed. Approximate analytic expressions reliably describing dependence of the collision efficiency on system parameters are presented. Available theories describing the competition between the droplet breakup and coalescence in flow are summarized and approximations used in their derivation are discussed. Problems with applicability of available theories on prediction of the droplet size evolution during mixing and processing of immiscible polymer blends, which have not been broadly discussed so far, are addressed.
在流动的不相容聚合物共混物混合和加工过程中控制其相结构演变，对于定制其性能至关重要。本综述总结了目前对具有分散结构的流动不相容聚合物共混物相结构演变的理解和可预测性的现状。综述了流动中液滴破碎的研究结果，这对于确定液滴破碎频率和子液滴的尺寸分布很重要。讨论了流动诱导聚并理论，该理论提供了碰撞效率的方程。给出了可靠描述碰撞效率与系统参数关系的近似解析表达式。总结了描述流动中液滴破碎和聚并竞争的现有理论，并讨论了其推导中使用的近似方法。解决了现有理论在预测不相容聚合物共混物混合和加工过程中液滴尺寸演变方面的适用性问题，这些问题迄今尚未得到广泛讨论。
