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An attempt to mechanistically explain the viscoelastic behavior of transparent epoxy/starch-modified ZnO nanocomposite coatings
Abstract
The effects of bare and starch-modified ZnO (ZnO-St) nanoparticles on viscoelastic and mechanical properties are studied by dynamic mechanical and tensile analyses. Transparent epoxy-based nanocomposite films are prepared by incorporating bare or starch-modified ZnO particles into the epoxy matrix. The results demonstrated that ZnO particles hindered the curing reactions and hence the final properties of the cured epoxy. As a result, glass-transition temperature (Tg) and crosslinking density demoted. However, starch as a surface modifier compensated for the undesired effects of ZnO in a way that by enhancing the curing reactions through autocatalytic mechanism, Tg and crosslinking density increased. The storage moduli for epoxy, epoxy/ZnO and epoxy/ZnO-St are accordingly as 13.84, 3.95 and 19.54 MPa. Therefore, the molecular weight between the entanglements is calculated as 0.2878, 1.0089 and 0.2039 in the same order. Moreover, considering the peaks of the tanδ diagrams, Tgs for epoxy, epoxy/ZnO and epoxy/ZnO-St are obtained as 95.95, 100.16 and 101.24 °C, respectively. Comparing epoxy/ZnO-St nanocomposite to epoxy, it can be inferred that the network becomes tougher in the elastic region and then becomes softer passing this region. Mechanistic sketches of epoxy network formation in the presence of bare and surface-treated nanoparticles are discussed.
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Authors (7)
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Morteza Ganjaee
- Institute for Color Science and Technology Department of Nanomaterials and Nanocoatings
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Henri Vahabi
- Université de Lorraine, Laboratoire MOPS
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Xavier Gabrion
- FEMTO-ST Institute, Department of Applied Mechanics, UMR 6176, University Bourgogne-Franche-Comté, CNRS/ENSMM/UFC/UTBM
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Pascal Laheurte
- Universite de Lorraine, Laboratoire LEM3
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Payam Zarrintaj
- University of Tehran College of Engineering, School of Chemical Engineering
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Mohammad Saeb
- Institute for Color Science and Technology Department of Resin and Additives
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Keywords
Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
PROGRESS IN ORGANIC COATINGS
no. 119,
pages 171 - 182,
ISSN: 0300-9440 - Language:
- English
- Publication year:
- 2018
- Bibliographic description:
- Ganjaee M., Vahabi H., Gabrion X., Laheurte P., Zarrintaj P., Formela K., Saeb M.: An attempt to mechanistically explain the viscoelastic behavior of transparent epoxy/starch-modified ZnO nanocomposite coatings// PROGRESS IN ORGANIC COATINGS. -Vol. 119, (2018), s.171-182
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.porgcoat.2018.02.016
- Verified by:
- Gdańsk University of Technology
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