Block Copolymer Vitrimers
Block Copolymer Vitrimers
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DOI：
10.1021/jacs.9b10360
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发表时间：
2020-01-08
影响因子：
15
通讯作者：
Sumerlin, Brent S.
中科院分区：
文献类型：
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作者：
Lessard, Jacob J.;Scheutz, Georg M.;Sumerlin, Brent S.
在这份报告中，我们将嵌段共聚物与玻璃化聚合物合并，以努力实现对缔合交联交换和流动的高阶、纳米级控制的前景。我们展示了通过精确控制聚合物的结构和分子量，将控制聚合作为了解基本结构和性能影响的重要工具的使用。由自组装嵌段共聚物得到的玻璃体与由统计共聚物产生的类似物相比，具有更好的抗宏观变形能力。我们的结果表明，通过控制嵌段玻璃体的链拓扑结构获得的增强的蠕变抗力可以用来调整粘弹性性能。这类新材料中微观相分离结构对宏观变形的阻力使嵌段玻璃体与其统计相对应的玻璃体区别开来，并引入了对粘弹性流动进行拓扑控制的可能性。
In this report, we merge block copolymers with vitrimers in an effort to realize the prospect of higher-order, nanoscale control over associative cross-link exchange and flow. We show the use of controlled polymerization as a vital tool to understand fundamental structure property effects through the precise control of polymer architecture and molecular weight. Vitrimers derived from self-assembling block copolymers exhibit superior resistance to macroscopic deformation in comparison to their analogs generated from statistical copolymers. Our results suggest that the enhanced creep resistance achieved by control over chain topology in block vitrimers can be used to tune viscoelastic properties. The resistance to macroscopic deformation that arises from a microphase-separated structure in this new class of materials differentiates block vitrimers from their statistical counterparts and introduces the potential of topology-control over viscoelastic flow.