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Switching Off the Tackiness of a Nanocomposite Adhesive in 30 s via Infrared Sintering.

Gurney, RS, Dupin, D, Nunes, JS, Ouzineb, K, Siband, E, Asua, JM, Armes, SP and Keddie, JL (2012) Switching Off the Tackiness of a Nanocomposite Adhesive in 30 s via Infrared Sintering. ACS Appl Mater Interfaces, 4 (10). 5442 - 5452. ISSN 1944-8244

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Abstract

Soft adhesives require an optimum balance of viscous and elastic properties. Adhesion is poor when the material is either too solidlike or too liquidlike. The ability to switch tack adhesion off at a desired time has many applications, such as in recycling, disassembly of electronics, and painless removal of wound dressings. Here, we describe a new strategy to switch off the tack adhesion in a model nanocomposite adhesive in which temperature is the trigger. The nanocomposite comprises hard methacrylic nanoparticles blended with a colloidal dispersion of soft copolymer particles. At relatively low volume fractions, the nanoparticles (50 nm diameter) accumulate near the film surface, where they pack around the larger soft particles (270 nm). The viscoelasticity of the nanocomposite is adjusted via the nanoparticle concentration. When the nanocomposite is heated above the glass transition temperature of the nanoparticles (T(g) = 130 °C), they sinter together to create a rigid network that raises the elastic modulus at room temperature. The tackiness is switched off. Intense infrared radiation is used to heat the nanocomposites, leading to a fast temperature rise. Tack adhesion is switched off within 30 s in optimized compositions. These one-way switchable adhesives have the potential to be patterned through localized heating.

Item Type: Article
Additional Information: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher.To access the final edited and published work see http://dx.doi.org/10.1021/am3013642.
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Symplectic Elements
Date Deposited: 06 Nov 2012 11:22
Last Modified: 23 Sep 2013 19:44
URI: http://epubs.surrey.ac.uk/id/eprint/731947

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