Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8879872 | Industrial Crops and Products | 2018 | 9 Pages |
Abstract
The main aim of this study was to develop a novel approach to incorporate high cellulose nanofiber (CNF) loadings into polyvinyl alcohol (PVA) nanocomposites. The nanocomposites were prepared by freezing via liquid nitrogen and consequent freeze drying combined with hot press molding. To investigate the effect of the molding parameters on the morphological, mechanical and thermal properties, chemical structure and transparency of the PVAâ¯+â¯CNF nanocomposites, two different mold pressures, temperatures and holding times were used for fabrication of PVAâ¯+â¯CNF nanocomposites. The maximum tensile strength of 121â¯MPa of the PVAâ¯+â¯CNF 20% nanocomposites was obtained when they were molded at 130â¯Â°C and 50â¯kPa for 7â¯min. Dynamic mechanical analysis showed that the storage modulus of the composites prepared at 130â¯Â°C and 50â¯kPa for 7â¯min is about 20% higher than nanocomposites molded at 150â¯Â°C and 150â¯kPa for 10â¯min. Optical properties (absorption spectra) of the PVA and PVAâ¯+â¯CNF nanocomposites were increased as the mold pressures, temperature and holding time increased. Micrographs showed more sough fracture surface with increasing pressure and temperature during hot press molding.
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Authors
Shooboo Salehpour, Fatemeh Rafieian, Mehdi Jonoobi, Kristiina Oksman,