Directional Adhesion of Monodomain Liquid Crystalline Elastomers,ACS Applied Materials & Interfaces

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Directional Adhesion of Monodomain Liquid Crystalline Elastomers
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-01-24 , DOI: 10.1021/acsami.3c16760
Paula A Pranda ₁ , Aaron Hedegaard ₂ , Hyunki Kim ₂ , Jason Clapper ₂ , Eric Nelson ₂ , Lindsey Hines ₂ , Ryan C Hayward _{1,

3} , Timothy J White _{1,

3}

Affiliation

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.

中文翻译：

单畴液晶弹性体的定向粘合

压敏粘合剂（PSA）广泛应用于消费品、医疗保健和商业行业。 PSA 的各向异性粘附通常需要实现高力容量和轻松释放，并且通常通过引入复杂的表面和/或本体微观结构同时保持高表面顺应性来实现。尽管有效，但微结构制造会增加粘合剂制造的成本和复杂性。在这里，我们探索排列液晶弹性体（LCE）作为定向粘合剂。对齐的 LCE 在负载下表现出方向相关的刚度、耗散和非线性变形。通过改变交联含量，我们研究了 LCE 的整体机械性能与其剥离强度和剥离各向异性的关系。我们证明，当 LCE 平行与垂直于对准轴剥离时，测得的剥离力存在高达 9 倍的差异。具有不同指向矢图案的单片 LCE 提供了空间局部化粘附的机会。

更新日期：2024-01-24

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