Diketopyrrolopyrrole-based polymer fibrils formation by changing molecular conformation during film formation
Diketopyrrolopyrrole-based polymer fibrils formation by changing molecular conformation during film formation
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DOI：
10.1002/polb.24609
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Liang Chen;Kefeng Zhao;Xinxiu Cao;Jiangang Liu;Xinhong Yu;Yanchun Han
中科院分区：
文献类型：
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作者：
Liang Chen;Kefeng Zhao;Xinxiu Cao;Jiangang Liu;Xinhong Yu;Yanchun Han
共轭聚合物薄膜的微观结构与其构象、成膜工艺等因素密切相关。在这篇文章中，我们展示了如何在成膜过程中诱导共轭聚合物主链的更平坦化构象，并最终导致流延膜的原纤形成。我们使用的共轭聚合物是聚[[2，5-双（2-辛基十二烷基）-2，3，5，6-四氢-3，6-二氧代吡咯并[3，4-c]吡咯-1，4-二基]-alt-[[2，2 ′-（2，5-噻吩）双噻吩并[3，2-B]噻吩]-5，5 ′-二基]]（PDPPTT-T）。主要溶剂为氯仿（CF），脂肪族1，8-二碘辛烷（DIO）用作添加剂，其具有与共轭聚合物侧链相似的溶解度参数，是共轭主链的不良溶剂，并且具有比CF低的挥发性。因此，在成膜期间，氯仿比添加剂蒸发得更快。在氯仿完全蒸发后，侧链仍然溶解在添加剂中，这降低了空间位阻并改善了PDPPTT-T的共轭主链的平坦化构象。使用脂肪族添加剂加工的膜具有纤维状形态，而从CF溶剂浇铸的膜是无特征的。TEM图像显示纤维的宽度约为30 nm，长度为数百nm。PDPPTT-T的主链平行于原纤维的长轴。© 2018威利期刊股份有限公司J.波利姆科学，部分B：聚合物物理2018，56，1079 - 1086
The microstructure of conjugated polymers film is strongly dependent on factors such as the conformation and the film formation processing. In this article, we show how to induce more planarization conformation of conjugated polymer backbone during film formation processing and finally leading to the fibrils formation of the cast film. The conjugated polymer we used is poly[[2,5‐bis(2‐octyldodecyl)‐2,3,5,6‐tetrahydro‐3,6‐dioxopyrrolo[3,4‐c]pyrrole‐1,4‐diyl]‐alt–[[2,2′‐(2,5‐thiophene)bis‐thieno[3,2‐b]thiophen]‐5,5′‐diyl]] (PDPPTT‐T). The main solvent is chloroform (CF), the aliphatic 1,8‐diiodooctane (DIO) is used as the additives, which has similar solubility parameter to the conjugated polymer side chain, is a bad solvent to the conjugated backbone and has a lower volatility than CF. Thus, during the film formation, chloroform was evaporated faster than the additive. After the chloroform evaporated completely, the side chain was still dissolved in the additive, which decreases the steric hindrance and improves planarization conformation of the conjugated backbone of PDPPTT‐T. Films processed using the aliphatic additives have fibrillar morphology while films cast from the CF solvent were featureless. TEM images reveal that the fibrils were about 30 nm in width and several hundred nanometers in length. The backbones of PDPPTT‐T were parallel to the long axis of fibrils. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys.2018,56, 1079–1086