Waterborne polyurethane: the effect of the addition or in situ formation of silica on mechanical properties and adhesion |
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| Affiliation: | 1. Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre 91501-970, Brazil;2. Universidade Luterana do Brasil, Faculdade de Química, Av. Farroupilha, 8001, 92425-900, Canoas, Brazil;1. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran;2. Center of Excellence for High Performance Materials, School of Metallurgy and Materials Engineering, University of Tehran, Tehran, Iran;3. Advanced Metalforming and Thermomechanical Processing Laboratory, School of Metallurgy and Materials Engineering, University of Tehran, Tehran, Iran;1. Adhesion and Adhesives Laboratory, Department of Inorganic Chemistry. University of Alicante, 03080 Alicante, Spain;2. UBE Corporation Europe, Polígono El Serrallo, 12100 Grao, Castellón, Spain;1. Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu, 610065, PR China;2. State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, PR China |
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| Abstract: | A series of composites consisting of commercial waterborne polyurethane (PU) and silica were prepared by in situ synthesis (sol-gel method) and compared to those prepared by the addition of commercial silica (blending method). Adhesion resistance, mechanical resistance, small-angle X-ray scattering (SAXS) and differential scanning calorimetry (DSC) measurements were performed in order to evaluate the effect of silica addition. The adhesion resistance reached a maximum at 3 wt.% of added silica. Comparing the sol-gel composites with the analog composites obtained by the addition of commercial nanosilica, it was observed that although the composites containing commercial silica displayed higher mechanical resistance, better adhesion was obtained with the in situ method. The DSC results showed increasing crystallinity with increasing silica addition. |
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| Keywords: | Adhesives Polyurethanes Silica Nanoparticles SAXS |
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