Thermal Annealing Induced Formation of Polymeric Nanopillars of Asymmetric Bottlebrush Block Copolymers
Thermal Annealing Induced Formation of Polymeric Nanopillars of Asymmetric Bottlebrush Block Copolymers
复制标题
热退火诱导不对称瓶刷嵌段共聚物聚合物纳米柱的形成
DOI：
10.1016/j.polymer.2019.121983
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发表时间：
--
期刊：
影响因子：
4.6
通讯作者：
Xing-He Fan
中科院分区：
文献类型：
--
作者：
Qian Wang;Fan Wu;Longfei Luo;Zhihao Shen;Xing-He Fan
多面体聚合物颗粒对于各种应用是期望的，但是由于球体形成的热力学可折叠性，制造受到限制。在此，我们采用了一种新的策略，通过热退火瓶刷嵌段共聚物（BBCP）的几何不对称性，制备各向异性纳米柱。分别在50 °C和60 °C热退火后形成螺母状组装体和六方纳米柱，这在嵌段共聚物的自组装中是罕见的。粒子的形状转变是由热力学驱动的，而六方纳米柱的形成主要归因于熵起源（BBCP的分子几何形状）。本工作为制备具有新型结构的纳米材料提供了一种新的思路。
Polyhedral polymeric particles are desirable for various applications, but the fabrication is limited due to thermodynamic favorability of sphere formation. Herein, we employed a new strategy to prepare anisotropic nanopillars by thermally annealing bottlebrush block copolymers (BBCPs) with geometric asymmetry. Screw nut-like assembly and hexagonal nanopillars are formed after thermal annealing at 50 °C and 60 °C, respectively, which is rare in self-assembly of block copolymers. The shape transformation of the particles is thermodynamically driven, while the formation of hexagonal nanopillars is mainly attributed to entropic origin (the molecular geometry of the BBCP). This work provides a new strategy to prepare nanomaterials with noval structures.