Abrasion resistance of waterborne polyurethane films incorporated with PU/silica hybrids |
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| Affiliation: | 1. National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, China;2. Sichuan Textile Scientific Research Institute, Chengdu 610072, China;3. High-tech Organic Fibers Key Laboratory of Sichuan Province, Chengdu 610072, China;1. Chengdu Institute of Organic Chemistry, Chinese Academy of Science, Center of Polymer Science and Technology, Chengdu 610041, People''s Republic of China;2. University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, People''s Republic of China;3. National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, People''s Republic of China;4. Key Laboratory of Leather Chemistry and Engineering (Sichuan University), Ministry of Education, Chengdu 610065, People''s Republic of China;1. Chemical Engineering Department, Universitat Politècnica de Catalunya (UPC), EEBE, 08019, Av. Eduard Maristany 10-14, Barcelona, Spain;2. Polyurethane R&D Department, BASF Española S.L. Curtex Division, 08907, Carretera del Mig 219, Barcelona, Spain;1. Nanostructured Polymers and Composites Department, Institute of Macromolecular Chemistry AS CR, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic;2. Polymer Processing Department, Institute of Macromolecular Chemistry AS CR, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic;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. College of Chemistry, Nanchang University, Nanchang, 330031, China;2. School of Resources, Environmental and Chemical Engineering, Nanchang University, Nanchang, 330031, China;3. Nanchang Hangkong University, Nanchang, 330063, China |
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| Abstract: | We describe polyurethane (PU)/silica hybrids (PSHs) prepared through hydrolysis and condensation reactions of tetraethoxysilane (TEOS) with or without methyltriethoxysilane (MTES) in the presence of polyurethane dispersion, which were subsequently incorporated into waterborne polyurethane (WPU) to prepare composites. The effects of the solid mass ratio of PSHs/WPU on the particle size of composite emulsions, the dispersion of silica nanoparticles in composite films, and the hardness and abrasion resistance of the corresponding films were examined. Composite emulsions possess a nanoscale particle size when incorporated with PSHs prepared using TEOS and MTES as precursors, and are superior to those with PSHs prepared using TEOS alone. Transmission electron microscopy revealed that silica nanoparticles had a uniform distribution in the polymer matrix and agglomerates could be almost completely avoided through in situ modification of silica with Si-CH3 groups in the polyurethane dispersion. Composite films prepared with this method exhibited a superior hardness and abrasion resistance even at a lower silica content compared with that containing unmodified silica. In particular, optical microscopy and scanning probe microscopy observations demonstrated wear behavior differences among these composite films from the macro- and nanoscale viewpoints, respectively. It is proved that abrasive wear occurs, and surface morphology studies are in accordance with the results of abrasion resistance tests. |
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| Keywords: | Abrasion resistance Waterborne polyurethane Hybrid Silica Surface morphology |
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