Formation of Anisotropic Liquid Crystalline Nanoparticles via Polymerization-Induced Hierarchical Self-Assembly,ACS Macro Letters

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Formation of Anisotropic Liquid Crystalline Nanoparticles via Polymerization-Induced Hierarchical Self-Assembly
ACS Macro Letters ( IF 5.1 ) Pub Date : 2018-03-02 00:00:00 , DOI: 10.1021/acsmacrolett.8b00082
Song Guan _{1,

2} , Chen Zhang ₁ , Wei Wen ₁ , Ting Qu ₁ , Xiaoxiong Zheng ₁ , Yongbin Zhao ₃ , Aihua Chen _{1,

2}

Affiliation

Polymeric nanoparticles (NPs) containing liquid crystalline (LC) mesogens with tunable anisotropic morphologies have applications in various fields, but their preparation typically suffers from tedious and low-throughput approaches. Here we present an efficient route to the preparation of anisotropic morphologies of azobenzene-containing block copolymers (BCPs) at high solids content via a polymerization-induced hierarchical self-assembly in ethanol. Various anisotropic NPs, including cuboids, short belts, lamellae, and ellipsoidal vesicles, have been obtained in a remarkably broad range of BCP compositions. The NPs exhibit a smectic phase with ordered stripes when observed under TEM. This internal LC ordering plays a significant role on the formation of these intriguing anisotropic morphologies. Morphological transitions from anisotropic to isotropic spheres can be obtained upon UV illumination due to the photoresponsive properties of the azobenzene mesogens. This work significantly expands the scope of accessible morphologies in PISA and suggests that the under explored LC BCPs may have an impactful role in the PISA field.

中文翻译：

通过聚合诱导分层自组装形成各向异性液晶纳米粒子

含有具有可调各向异性形态的液晶 (LC) 介晶的聚合物纳米粒子 (NPs) 在各个领域都有应用，但它们的制备通常受到繁琐和低通量的方法的困扰。在这里，我们提出了一种通过聚合诱导的乙醇中的分级自组装来制备高固含量的含偶氮苯嵌段共聚物 (BCP) 的各向异性形态的有效途径。各种各向异性的 NPs，包括长方体、短带、薄片和椭圆形囊泡，已经在非常广泛的 BCP 组合物中获得。当在 TEM 下观察时，NPs 呈现出具有有序条纹的近晶相。这种内部 LC 排序对这些有趣的各向异性形态的形成起着重要作用。由于偶氮苯介晶的光响应特性，可以在紫外线照射下获得从各向异性球体到各向同性球体的形态转变。这项工作显着扩展了 PISA 中可访问形态的范围，并表明正在探索的 LC BCP 可能在 PISA 领域中发挥重要作用。

更新日期：2018-03-02

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