Switching Off the Tackiness of a Nanocomposite Adhesive in 30 s via Infrared Sintering
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- 作者：Robert S. Gurney ; Damien Dupin ; Juliana S. Nunes ; Keltoum Ouzineb ; Elodie Siband ; Jos茅 M. Asua ; Steven P. Armes ; Joseph L. Keddie
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2012
- 出版时间：October 24, 2012
- 年：2012
- 卷：4
- 期：10
- 页码：5442-5452
- 全文大小：533K
- 年卷期：v.4,no.10(October 24, 2012)
- ISSN：1944-8252
文摘
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 (Tg = 130 掳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.