Polymorphism of a semi-crystalline diketopyrrolopyrrole-terthiophene polymer,Journal of Polymer Science

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Polymorphism of a semi-crystalline diketopyrrolopyrrole-terthiophene polymer
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-11-10 , DOI: 10.1002/pol.20200673
Mengmeng Li _{1,

2,

3,

4} , Pieter J Leenaers ₂ , Junyu Li ₂ , Martijn M Wienk ₂ , René A J Janssen _{2,

3}

Affiliation

Few semiconducting polymers are known that possess more than one semi-crystalline structure. Guidelines for rationalizing or creating polymorphism in these materials do not exist. Two different semi-crystalline polymorphs, β₁ and β₂, and an amorphous α phase have recently been identified for alternating diketopyrrolopyrrole-quaterthiophene copolymers (PDPP4T). The polymorphs differ structurally by the π–π stacking distance, and electronically by the optical bandgap and charge carrier mobility. Here we investigate the corresponding terthiophene (PDPP3T) derivatives, to study the effect of the relative orientation of adjacent DPP units on the polymorphism. In PDPP3T, the relative orientation of DPP units alternates along the chain, while in PDPP4T it is constant. We show that the two polymorphs, β₁ and β₂, can also be generated for a PDPP3T polymer in solution and thin film. Interestingly, compared to PDPP4T, more solvents can induce the two distinct semi-crystalline polymorphs for PDPP3T via a β₁ → α → β₂ polymorphic transition.

中文翻译：

半结晶二酮吡咯并吡咯-三噻吩聚合物的多晶型

已知很少有半导体聚合物具有超过一种半结晶结构。不存在在这些材料中合理化或创造多态性的指导方针。最近发现了交替二酮吡咯并吡咯-四噻吩共聚物（PDPP4T）的两种不同的半结晶多晶型物β ₁和β ₂以及无定形α相。这些多晶型物在结构上因π-π堆叠距离而不同，在电子学上则因光学带隙和载流子迁移率而不同。在这里，我们研究了相应的三噻吩（PDPP3T）衍生物，以研究相邻DPP单元的相对方向对多态性的影响。在 PDPP3T 中，DPP 单元的相对方向沿着链交替，而在 PDPP4T 中它是恒定的。我们表明，溶液和薄膜中的 PDPP3T 聚合物也可以生成两种多晶型物β ₁和β _{2 。}有趣的是，与 PDPP4T 相比，更多的溶剂可以通过β ₁ → α → β ₂多晶型转变诱导 PDPP3T 两种不同的半结晶多晶型。

更新日期：2020-11-10

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