Cross-linking is an essential element in enhancing polymers’ mechanical properties in adhesives, elastomers, and hydrogels. However, covalent cross-linking introduces a trade-off relationship between cohesive interactions and chain mobility of polymers, thus restricting stretching and adhesion properties. Herein, a supramolecular cross-linker is synthesized by giving an acrylate functional group to β-cyclodextrin. The supramolecular cross-linker shows a sliding effect in polymers with a threaded structure via the cavity of β-cyclodextrin. Compared to conventional adhesives, the supramolecular cross-linked adhesives exhibit exceptional stretching and adhesion properties because of their retained chain mobility from the sliding effect. This approach for movable cross-linking could widen adhesives’ application by overcoming the restrictions of conventional cross-linking.

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Micromechanical modeling to calculate the mechanical properties of fiber reinforced composites is proposed. To describe the mechanical behavior of the yarn and the matrix, which are the main constituents of fiber reinforced composites, the elastoplastic constitutive law was adopted. In particular, anisotropic elastoplasticity based on Hill's orthotropic yield function and anisotropic kinematic hardening was utilized for the yarn, while the isotropic elastoplastic constitutive law was applied for the matrix. The effective properties of the unit cell in fiber reinforced composites were then calculated based on the finite element method. For verification, the method was successfully applied for 3D braided glass/Kevlar fiber reinforced composites in both linear elastic and nonlinear inelastic ranges. POLYM. COMPOS., 28:722–732, 2007. © 2007 Society of Plastics Engineers