Self‐assembly of poly(3‐hexyl thiophene)‐b‐poly(ethylene oxide) into cylindrical micelles in binary solvent mixtures
Self‐assembly of poly(3‐hexyl thiophene)‐b‐poly(ethylene oxide) into cylindrical micelles in binary solvent mixtures
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DOI：
10.1002/app.41186
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发表时间：
2014-12
影响因子：
3
通讯作者：
Jingyi Li;X. Li;D. Ni;Jianyin Wang;G. Tu;Jintao Zhu
中科院分区：
文献类型：
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作者：
Jingyi Li;X. Li;D. Ni;Jianyin Wang;G. Tu;Jintao Zhu
通过Heck反应合成了聚3-己基噻吩（P3 HT）与聚环氧乙烷（PEO）的不对称嵌段共聚物。PEO嵌段的加入对P3 HT嵌段的有效共轭长度没有影响，并且显然为形成稳定的纳米结构提供了胶体稳定性。在良溶剂中引入贫溶剂，P3 HT-b-PEO的共轭骨架通过π-π堆积，在结晶驱动下自组装成以P3 HT为核心的圆柱形胶束。与良溶剂中的聚合物相比，圆柱形胶束的吸收光谱显示出红移，这表明圆柱形胶束内的聚合物链的π-π堆积改善，共轭长度延长。我们的研究结果表明，当使用几种不同的二元溶剂混合物的溶剂性质不同时，可以得到不同直径和长度的圆柱形胶束。更有趣的是，我们证明了超声处理可以破碎的圆柱形胶束只有当比例的不良溶剂增加。这为聚合物太阳能电池和有机光电子器件的制备提供了一种简便有效的方法。© 2014 Wiley Periodicals，Inc. J.应用聚合物Sci. 2014，131，41186。
Asymmetric block copolymer based on regioregular poly(3-hexyl thiophene) (P3HT) and poly(ethylene oxide) (PEO) was synthesized through Heck reactions. The addition of PEO block has no influence in the effective conjugation length of P3HT block and apparently provides colloidal stability for the formation of stable nanostructures. Introduction of poor solvent to good solvent containing P3HT-b-PEO will induce the crystallization-driven assembly of the P3HT into cylindrical micelles with a P3HT core, owing to π–π stacking of the conjugated backbone of P3HT. The absorption spectra of the cylindrical micelles reveal a red shift as compared to the polymer in good solvent, indicating the extension of conjugation length with an improved π–π stacking of the polymer chains within the cylindrical micelles. Our results indicated that cylindrical micelles with varied diameter and length can be obtained when solvent properties were varied using several different binary solvent mixtures. More interestingly, we demonstrate that ultrasonic processing can fragment the cylindrical micelles only when the ratio of poor solvent increases. This provides a facile and effective way to fabricate cylindrical micelles for applications in the area of polymer solar cell as well as organic optoelectronics device. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41186.