Control of the crystalline phase transition of polymers is critical to improve mechanical properties and to achieve good levels of thermal properties in polymer engineering. Current methods control the transition process by using thermal methods that is, annealing above the glass transition temperature (T_g) to get the targeting crystalline phase. It requires precise control of the temperature and process time and is limited to a small scale. In contrast, a novel processing‐based method developed in our group by combining the use of reactive processing technique and extensional mixing elements (EME) allows different sizes of minor phase droplets in immiscible polymer blends to be achieved by controlling the degree of aggressiveness of the EME. The use of EME can confine polyamide crystalline structure into the γ‐phase from the α‐phase. The reactive processing benefits in stabilizing these droplets and in freezing the corresponding crystalline morphologies in droplets. Crystalline phase transition of the minor phase in these droplets is therefore observed as the size of droplet decreases from micro to submicron. Furthermore, phase transition can be precisely controlled by tuning additives and EME blocks. POLYM. ENG. SCI., 60:1019–1028, 2020. © 2020 Society of Plastics Engineers

中文翻译：

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通过延伸支配的聚合物共混物反应挤出进行聚酰胺6的相控制

在聚合物工程中，控制聚合物的结晶相变对于提高机械性能和实现良好的热性能至关重要。当前的方法通过使用热方法来控制过渡过程，即在高于玻璃化转变温度（T _g）以获得目标结晶相。它需要精确控制温度和处理时间，并且仅限于小规模生产。相比之下，在我们小组中通过结合使用反应性加工技术和扩展混合元素（EME）而开发的一种新颖的基于加工的方法，可以通过控制聚合物的侵蚀程度来实现不混溶的聚合物共混物中不同大小的次要相滴。 EME。使用EME可以将聚酰胺晶体结构从α相限制为γ相。反应性处理有益于稳定这些液滴并冻结液滴中的相应晶体形态。因此，随着液滴尺寸从微米减小到亚微米，观察到这些液滴中次要相的结晶相变。此外，通过调整添加剂和EME模块，可以精确控制相变。POLYM。ENG。SCI。，60：1019-1028，2020.©2020塑料工程师协会