Alumina nanoparticles as formaldehyde scavenger for urea-formaldehyde resin: Rheological and in-situ cure performance
| Autor: | Washington Luiz Esteves Magalhães, Mirela Angelita Artner, Rilton Alves de Freitas, Pedro Henrique Gonzalez de Cademartori |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Mechanical Engineering Composite number Urea-formaldehyde Formaldehyde Thermosetting polymer 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences chemistry.chemical_compound chemistry Rheology Mechanics of Materials Ceramics and Composites Desiccator Thermal stability Composite material 0210 nano-technology Curing (chemistry) |
| Zdroj: | Composites Part B: Engineering. 176:107281 |
| ISSN: | 1359-8368 |
| DOI: | 10.1016/j.compositesb.2019.107281 |
| Popis: | Formaldehyde emission in the environment from thermosetting resins, like urea-formaldehyde (UF), is one of the most negative aspects of wood-based composite panels. UF resins with low or zero formaldehyde emission and keeping or improving their remarkable properties have been designed by different approaches, with special attention to organic and inorganic nanofillers. Although formaldehyde emission can be mitigated, controlling of rheology kinetics, curing and thermal stability are essential to avoid restrictions for practical applications. Here, we investigated the incorporation of small percentages of Al2O3 nanoparticles into UF resin regarding its rheology, thermodynamic mechanics, thermal kinetics and morphology. Changes on formaldehyde emission was determined by desiccator method and qualitatively illustrated by thermogravimetry-mass spectrometry analysis. The Al2O3 incorporation without significant agglomerations changed the viscosity of UF resin, presenting a shear thinning behavior, especially for higher quantity of nanoparticles. Likewise, analysis of thermodynamic mechanisms shows Al2O3 as an effective additive for UF resin without changing important curing parameters like vitrification point and gel temperature. Al2O3 nanoparticles are also effective to reduce the formaldehyde emission during the UF resin cure reactions at high temperatures and up to 14% in MDF composite panels at environmental temperatures. |
| Databáze: | OpenAIRE |
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