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首页> 外文期刊>ACS Macro Letters >Molecular Architecture Directs Linear-Bottlebrush-Linear Triblock Copolymers to Self-Assemble to Soft Reprocessable Elastomers
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Molecular Architecture Directs Linear-Bottlebrush-Linear Triblock Copolymers to Self-Assemble to Soft Reprocessable Elastomers

机译：分子结构指示线性瓶颈线性三嵌段共聚物，以自组装为软再加工弹性体

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摘要

Linear-bottlebrush-linear (LBBL) triblock co-polymers represent an emerging system for creating multifunctional nanostructures. Their self-assembly depends on molecular architecture but remains poorly explored. We synthesize polystyrene-block-bottlebrush polydimethylsiloxane-block-polystyrene triblock copolymers with controlled molecular architecture and use them as a model system to study the self-assembly of LBBL polymers. Unlike classical stiff rod flexible linear block copolymers that are prone to form highly ordered nanostructures such as lamellae, at small weight fractions of the linear blocks, LBBL polymers self-assemble to a disordered sphere phase, regardless of the bottlebrush stiffness. Microscopically, characteristic lengths increase with the bottlebrush stiffness by a power of 2/3, which is captured by a scaling analysis. Macroscopically, the formed nanostructures are ultrasoft, reprocessable elastomers with shear moduli of about 1 kPa, two orders of magnitude lower than that of conventional polydimethylsiloxane elastomers. Our results provide insights on exploiting the self-assembly of LBBL polymers to create soft functional nanostructures.
机译：线性瓶刷 - 线性（LBB1）三嵌段共聚物代表一种用于产生多功能纳米结构的新兴系统。他们的自我组装取决于分子建筑，但仍然仍然难以探索。通过受控分子架构合成聚苯乙烯 - 嵌段 - 瓶装聚二甲基硅氧烷 - 聚苯乙烯三嵌段共聚物，并使用它们作为研究LBBL聚合物的自组装的模型系统。与经典抗杆柔性线性嵌段共聚物不同，易于形成高度有序的纳米结构，例如薄片，在线性块的小重量分数中，无论瓶刷刚度如何，将LBBL聚合物自组装成无序球相。显微镜，特征长度随着2/3的功率而随着2/3的功率而增加，这被缩放分析捕获。宏观上，形成的纳米结构是超高，再加工弹性体的剪切模量为约1kPa，比常规聚二甲基硅氧烷弹性体低两个数量级。我们的结果提供了利用LBBL聚合物自组装以产生软功能纳米结构的见解。

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  • 来源
    《ACS Macro Letters》 |2019年第11期|共7页
  • 作者

    Nian Shifeng; Lian Huada; Gong Zihao; Zhernenkov Mikhail; Qin Jian; Cai Li-Heng;

  • 作者单位

    Univ Virginia Dept Mat Sci &

    Engn Charlottesville VA 22904 USA;

    Stanford Univ Dept Chem Engn Stanford CA 94305 USA;

    Univ Virginia Dept Mat Sci &

    Engn Charlottesville VA 22904 USA;

    Brookhaven Natl Lab Natl Synchrotron Light Source 2 Upton NY 11973 USA;

    Stanford Univ Dept Chem Engn Stanford CA 94305 USA;

    Univ Virginia Dept Mat Sci &

    Engn Charlottesville VA 22904 USA;

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  • 正文语种 eng
  • 中图分类 有机化学;
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