Synthesis and Self-Assembly of a Series of nPOSS-b-PEO Block Copolymers with Varying Shape Anisotropy
Synthesis and Self-Assembly of a Series of nPOSS-b-PEO Block Copolymers with Varying Shape Anisotropy
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系列不同形状各向异性nPOSS-b-PEO嵌段共聚物的合成与自组装
DOI：
10.1021/acs.macromol.7b00163
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发表时间：
2017
期刊：
影响因子：
5.5
通讯作者：
Wang Wei
中科院分区：
文献类型：
--
作者：
Yu Cheng-Bin;Ren Li-Jun;Wang Wei
对结构单元的形状各向异性的操纵正在创造多样和复杂的组装，特别是在胶体科学领域。嵌段共聚物的自组装已经产生了大量的纳米物体和/或纳米结构。本文报道了利用多面体低聚倍半硅氧烷（POSS）簇和不同分子量的线性聚环氧乙烷（PEO）设计合成了一系列具有不同形状各向异性的嵌段共聚物。POSS-b-PEO嵌段共聚物的制备是通过首先使用短的线性或树枝状连接体聚集一到四个POSS簇，然后将它们与线性PEO嵌段共价连接。以这种方式，POSS-b-PEO嵌段共聚物的形状各向异性变化很大。我们发现，在选定的溶剂中的PEO嵌段结晶驱动的嵌段共聚物自组装成大的纳米厚片。用TEM和XRD对薄膜进行了表征，发现薄膜为一层PEO晶层夹着两层POS晶层的结构。
Manipulation of shape anisotropy of building blocks is creating diverse and complex assemblies, in particular in the field of colloid science. Self-assembly of block copolymers has created a great number of nano-objects and/or nanostructures. Herein we report the design and synthesis of a series of block copolymers with varying shape anisotropy using polyhedral oligomeric silsesquioxane (POSS) cluster and linear poly(ethylene oxide)s (PEO) with different molecular weights. The POSS-b-PEO block copolymers were prepared by means of first gathering one to four POSS clusters using short linear or dendritic linkers and then covalently linking them with linear PEO blocks. In this way, the shape anisotropy of the POSS-b-PEO block copolymers is varied widely. We found that the PEO block crystallization in a selected solvent drives the block copolymers to self-assemble into large nanothick sheets. We characterized the sheets using TEM and XRD and found a structure of one PEO crystalline layer sandwiched by two POS...