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.
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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.
|Divisions :||Faculty of Engineering and Physical Sciences > Physics|
|Date :||March 2009|
|Identification Number :||10.1021/am800179y|
|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|
|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.|
|Depositing User :||Symplectic Elements|
|Date Deposited :||15 Aug 2011 14:07|
|Last Modified :||23 Sep 2013 18:44|
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