Abstract：
Pressure-sensitive adhesives (PSAs) are widely employed in consumer goods, health care, and commercial industry. Anisotropic adhesion of PSAs is often desirable to enable high force capacity coupled with facile release and has typically been realized through the introduction of complex surface and/or bulk microstructures while also maintaining high surface conformability. Although effective, microstructure fabrication can add cost and complexity to adhesive fabrication. Here, we explore aligned liquid crystalline elastomers (LCEs) as directional adhesives. Aligned LCEs exhibit direction-dependent stiffness, dissipation, and nonlinear deformation under load. By varying the cross-link content, we study how the bulk mechanical properties of LCEs correlate to their peel strength and peel anisotropy. We demonstrate up to a 9-fold difference in peel force measured when the LCE is peeled parallel vs perpendicular to the alignment axis. Opportunities to spatially localize adhesion are presented in a monolithic LCE patterned with different director orientations.
摘要：
压敏粘合剂（PSA）广泛用于消费品中，卫生保健,和商业行业。PSA的各向异性粘附通常期望能够实现与容易释放相结合的高力容量,并且通常通过引入复杂的表面和/或本体微结构同时还保持高的表面适形性来实现。虽然有效,微结构制造会增加粘合剂制造的成本和复杂性。这里,我们探索对齐液晶弹性体（LCE）作为定向粘合剂。对齐的LCE表现出方向依赖的刚度，耗散,荷载作用下的非线性变形。通过改变交叉链接的内容，我们研究了LCEs的整体机械性能如何与其剥离强度和剥离各向异性相关。我们证明了当平行于垂直于对准轴剥离LCE时测得的剥离力相差9倍。在具有不同导向器取向的整体LCE中呈现了空间定位粘附的机会。
