Ohzono, Takuya published the artcileImpact of Crystallites in Nematic Elastomers on Dynamic Mechanical Properties and Adhesion, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is crystallite nematic elastomer dynamic adhesion.
Crystallite formation in crosslinked polymeric networks can generally affect their mech. properties, resulting in a higher modulus and strength than those expected from pure entropic elasticity. However, the mechanism by which crystallite formation displaces the soft elasticity of nematic liquid crystal elastomers (LCEs) is unknown. In this study, a series of main-chain nematic LCEs are investigated to clarify how their stress-strain responses are modulated by temperature-dependent crystallite formation. With increasing content of alkyl chain segments that drive crystallite formation, the higher modulus along with a hysteretic stress-strain response overlays the soft elasticity. Entropic elasticity with low hysteresis recovers in isotropic states at higher temperatures The crystallite formation ability is accompanied by an aspect of the shape memory effect, which can enhance the adhesion force through annealing in contact before detachment. The present system demonstrates that the time-dependent stress-strain response of crosslinked polymers can be dynamically tuned by controlling the balance between the crystalline, liquid crystalline, and entropic nature of the chain components. Tuneability has profound implications for dynamic mech. applications.
Macromolecules (Washington, DC, United States) published new progress about Adhesion, physical. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate).
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