强且高度可切换的软粘性粘合剂
Strong and Highly Switchable Soft Sticky Adhesives
AI总结：
本文提出一种热可切换软粘性粘合剂，通过协同表面粘性、体相能量耗散和热响应聚合物链，实现室温约80 kPa强粘附与升温后约0.6 kPa近零粘附的可逆快速切换，并具备自修复与可回收性，适用于选择性拾取与释放等应用。
摘要：
许多生物系统能够对各种形状复杂的材料形成强粘附。这种粘附还可以在简单快速的方式下在强粘附与完全不粘附之间切换。相比之下，目前尚无工程系统实现同样稳健的粘附与切换。这一局限严重阻碍了若干新兴技术的发展，包括仿生机器人、基于装配的制造、精准医学、可穿戴与植入式设备，以及面向可持续性的按需材料拆解与回收。本文提出一种强且高度可切换粘附的设计方法，通过在热可切换软粘性粘合剂中协同表面粘性、体相能量耗散和刺激响应聚合物链来实现。该粘合剂在室温下对多种材料具有约80 kPa的高粘附强度。由于热响应表面聚合物链的回缩，该粘附在升高温度下可高度切换至接近消失（约0.6 kPa）。这种粘附切换可逆且可重复多个循环，能够对具有不同材料、形状、尺寸和重量的物体进行选择性拾取与释放。对于1 mm厚的粘合剂层，切换时间约为10 s，由通过粘合剂的热传导控制，快于或可比于大多数最先进方法。该粘合剂具有自修复能力，并且可回收、干燥、储存、再溶胀和重复使用，粘附与切换性能几乎保持完整。这种结合强粘附与刺激响应切换的协同设计可潜在扩展至各种聚合物体系，并可通过优化的表面结构进一步增强。
英文摘要：
Many biological systems can form strong adhesion to various materials with complex shapes. The adhesion is further switchable between strongly adhering and completely non-adhering in a simple and fast manner. By contrast, no engineering system has yet achieved the same robust adherence and switching. This limitation severely hinders the advancement of several emerging technologies including biomimetic robots, assembly-based manufacturing, precision medicine, wearable and implantable devices, as well as on-demand material dismantling and recycling for sustainability. Here we present a design approach for strong and highly switchable adhesion by synergizing the surface stickiness, bulk energy dissipation, and stimuli-responsive polymer chains in a thermo-switchable soft sticky adhesive. The adhesive has a high adhesion strength of about 80 kPa with diverse materials at room temperature. The adhesion is highly switchable to near-vanishing (about 0.6 kPa) at an elevated temperature due to the thermo-responsive surface polymer chain retraction. This adhesion switching is reversible and repeatable for many cycles, enabling selective pick-and-release of objects with various materials, shapes, sizes, and weights. The switching time is around 10 s with an adhesive layer of 1 mm, governed by thermal conduction through the adhesive, faster than or comparable to most state-of-the-art methods. The adhesive is self-healing, and can be recycled, dried, stored, reswollen, and reused with nearly intact adhesion and switching properties. The synergistic design combining strong adhesion and stimuli-responsive switching can be potentially extended to various polymer systems, and further enhanced by optimized surface architectures.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
