Isolation of the effect of the hairy layer length on the mechanical properties of waterborne coatings |
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| Affiliation: | 1. Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran;2. Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran;3. Department of Physics, University of Yazd, P.O. Box 97175/615, Yazd, Iran;1. Université Grenoble Alpes, LIPhy, F-38000 Grenoble, France;2. CNRS, LIPhy, F-38000 Grenoble, France;3. Laboratory of Theoretical Spectroscopy, V.E. Zuev Institute of Atmospheric Optics, SB, Russian Academy of Science, 1, Akademician Zuev Square, 634021 Tomsk, Russia;4. Mathematical Physics Department, Tomsk Polytechnic University 30, Lenin Avenue, 634050 Tomsk, Russia;5. Tomsk State University, Laboratory of Quantum Mechanics of Molecules and Radiative Processes, 36, Lenin Avenue, 634050 Tomsk, Russia;1. Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, CEP 91501-970 Porto Alegre, RS, Brazil;2. Departament d’Enginyeria Química, ETSEIB, Universitat Politècnica de Catalunya, Avda. Diagonal 647, Barcelona E-08028, Spain;3. Center for Research in Nano-Engineering, Universitat Politècnica de Catalunya, Campus Sud, Edifici C’, C/Pasqual i Vila s/n, Barcelona E-08028, Spain;4. Departamento de Engenharia de Materiais, PPGEM, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Setor 4, Prédio 74, CEP 91501-970 Porto Alegre, RS, Brazil |
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| Abstract: | The effect of the acidic hairy layer length on the interdiffusion of polymer between particles and as a consequence on the mechanical properties of the films produced from waterborne coatings has been studied. In order to isolate this effect, latexes with the same particle diameter and molecular weight but stabilized with poly(acrylic acid)-block-poly(butyl acrylate) (PAA-b-PBA) block copolymers of controlled and different lengths were prepared. Tensile strength measurements showed at the macroscopic level that the presence of AA chains in the particle surface reduced the mechanical properties of the films dried at room temperature, being its effect worse the longer the AA chain length. Higher annealing temperatures erased the negative effect of the acidic hairy layer on mechanical properties. The neutralization with NaOH instead of with NH4OH also led to worse mechanical properties. These macroscopic results were supported by Fluorescence Resonance Energy Transfer (FRET) experiments that showed that at the microscopic level, the extent of interdiffusion occurred slower when the AA chains in the particles surface increased, the annealing temperature was lower and when NaOH was used as neutralizing agent instead of NH4OH. |
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| Keywords: | Latex film formation FRET Mechanical properties Electrosteric stabilizers Controlled sized acidic hairy layer |
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