pH Dependence of the Properties of Waterborne Pressure-Sensitive Adhesives Containing Acrylic Acid
Wang, T, Canetta, E, Weerakkody, TG and Keddie, JL (2009) pH Dependence of the Properties of Waterborne Pressure-Sensitive Adhesives Containing Acrylic Acid ACS APPL MATER INTER, 1 (3). 631 - 639. ISSN 1944-8244
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Official URL: http://dx.doi.org/10.1021/am800179y
Polymer colloids are often copolymerized with acrylic acid monomers in order to impart colloidal stability. Here, the effects of the pH on the nanoscale and macroscopic adhesive properties of waterborne poly(butyl acrylate-co-acrylic acid) films are reported. In films cast from acidic colloidal dispersions, hydrogen bonding between carboxylic acid groups dominates the particle-particle interactions, whereas ionic dipolar interactions are dominant in films cast from basic dispersions. Force spectroscopy using an atomic force microscope and macroscale mechanical measurements show that latex films with hydrogen-bonding interactions have lower elastic moduli and are more deformable. They yield higher adhesion energies. On the other hand, in basic latex, ionic dipolar interactions increase the moduli of the dried films. These materials are stiffer and less deformable and, consequently, exhibit lower adhesion energies. The rate of water loss from acidic latex is slower, perhaps because of hydrogen bonding with the water. Therefore, although acid latex offers greater adhesion, there is a limitation in the film formation.
|Additional Information:||This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher.|
|Uncontrolled Keywords:||latex, film formation, adhesion, adhesives, acrylic acid, pH, ATOMIC-FORCE MICROSCOPY, LATEX FILMS, POLY(ACRYLIC ACID), SOFT ADHESIVES, PARTICLE-SIZE, DEFORMATION, MODEL, TACK, FIBRILLATION, BEHAVIOR|
|Divisions:||Faculty of Engineering and Physical Sciences > Physics|
|Deposited By:||Symplectic Elements|
|Deposited On:||15 Aug 2011 15:07|
|Last Modified:||01 Mar 2013 14:37|
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