Xie Renxuan, Mukherjee Sanjoy, Levi Adam E, Reynolds Veronica G, Wang Hengbin, Chabinyc Michael L, Bates Christopher M
Materials Research Laboratory, University of California, Santa Barbara, CA 93106, USA.
Mitsubishi Chemical Center for Advanced Materials, University of California, Santa Barbara, CA 93106, USA.
Sci Adv. 2020 Nov 13;6(46). doi: 10.1126/sciadv.abc6900. Print 2020 Nov.
Super-soft elastomers derived from bottlebrush polymers show promise as advanced materials for biomimetic tissue and device applications, but current processing strategies are restricted to simple molding. Here, we introduce a design concept that enables the three-dimensional (3D) printing of super-soft and solvent-free bottlebrush elastomers at room temperature. The key advance is a class of inks comprising statistical bottlebrush polymers that self-assemble into well-ordered body-centered cubic sphere phases. These soft solids undergo sharp and reversible yielding at 20°C in response to shear with a yield stress that can be tuned by manipulating the length scale of microphase separation. The addition of a soluble photocrosslinker allows complete ultraviolet curing after extrusion to form super-soft elastomers with near-perfect recoverable elasticity well beyond the yield strain. These structure-property design rules create exciting opportunities to tailor the performance of 3D-printed elastomers in ways that are not possible with current materials and processes.
源自刷状聚合物的超软弹性体有望成为用于仿生组织和器件应用的先进材料，但目前的加工策略仅限于简单成型。在此，我们引入一种设计理念，能够在室温下对超软且无溶剂的刷状弹性体进行三维（3D）打印。关键进展是一类包含统计刷状聚合物的油墨，它们自组装成有序的体心立方球体相。这些软固体在20°C下响应剪切时会发生急剧且可逆的屈服，其屈服应力可通过控制微相分离的长度尺度来调节。添加可溶性光交联剂可使挤出后的材料完全紫外固化，从而形成具有近乎完美的可恢复弹性且远超屈服应变的超软弹性体。这些结构-性能设计规则为定制3D打印弹性体的性能创造了令人兴奋的机会，而这是现有材料和工艺无法实现的。
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