Mission immiscible: overcoming the miscibility limit of semiconducting:ferroelectric polymer blends via vitrification
Mission immiscible: overcoming the miscibility limit of semiconducting:ferroelectric polymer blends via vitrification
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不混溶的任务：通过玻璃化克服半导体：铁电聚合物共混物的混溶性极限
DOI：
10.1039/d3tc00071k
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发表时间：
2023
影响因子：
6.4
通讯作者：
Stingelin, Natalie
中科院分区：
文献类型：
--
作者：
Khirbat, Aditi;Nahor, Oded;Kantrow, Henry;Bakare, Oladipo;Levitsky, Artem;Frey, Gitti L.;Stingelin, Natalie
共混提供了一个通用的加工平台，可以在一个给定的材料系统中组合联合收割机的多种特性，这些特性可能无法在一个单一的组件中实现，或者可以协同地引入全新的特性。然而，由于聚合物的混合倾向低，特别是当从熔体加工时，聚合物的混合可能具有挑战性。在这里，我们证明，基本上整个光谱的相形态，从基本上完全混合到强烈的相分离，可以可靠地诱导从原型的聚合物半导体，聚（3-己基噻吩），P3 HT，和聚（偏二氟乙烯），PVDF，聚合物，可以表现出铁电多晶型物，尽管固有的有限的可折叠性的特点P3 HT和PVDF的共混物。我们通过操纵溶液中的链缠结来实现这一点，这反过来又决定了两种组分的分子流动性（即，固化过程中的质量传递），并且在极端情况下导致固态下的明显玻璃化。由于部分充分混合的系统，可以产生时，从一个良好的溶剂处理的两个组件，我们得出结论，缠结之间形成P3 HT和PVDF分子，提供了它们的分子量和浓度足够高。因此，通过建立结构、相形态和性能之间的可靠相互关系，可以将特定的相形态定位于广泛的材料发现。
Blending offers a versatile processing platform to combine multiple properties in a given material system that may not be realized in one single component, or to induce co-operatively entirely new features. Polymers can, however, be challenging to blend due to their low tendency to mix, especially when processed from the melt. Here, we demonstrate that essentially the entire spectrum of phase morphologies, from basically fully intermixed to strongly phase-separated, can be induced reliably in blends produced from the archetypal polymer semiconductor, poly(3-hexyl thiophene), P3HT, and poly(vinylidene fluoride), PVDF, a polymer that can exhibit ferroelectric polymorphs, despite the intrinsically limited miscibility featured by P3HT and PVDF. We achieve this by manipulating chain entanglements in solution, which in turn dictates the molecular mobility of the two components (i.e., mass transport during solidification), and in extreme cases leads to pronounced vitrification in the solid state. Since partly- to well-intermixed systems can be produced when processed from a good solvent for both components, we conclude that entanglements form between P3HT and PVDF molecules, provided their molecular weight and concentration is sufficiently high. Hence, specific phase morphologies can be targeted towards broad materials discovery via the establishment of reliable interrelationships between structure, phase morphology, and properties.