Lignocellulosic flour-reinforced poly(hydroxybutyrate-co-valerate) composites
| Autor: | Danièle Dupeyre, Alain Dufresne, Michel Paillet |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Scanning electron microscope General Chemistry Dynamic mechanical analysis Valerate Surfaces Coatings and Films law.invention chemistry.chemical_compound Differential scanning calorimetry chemistry law Percolation Ultimate tensile strength Materials Chemistry Crystallization Cellulose Composite material |
| Zdroj: | Journal of Applied Polymer Science. 87:1302-1315 |
| ISSN: | 1097-4628 0021-8995 |
| DOI: | 10.1002/app.11546 |
| Popis: | Residual lignocellulosic flour from spruce and ground olive stone was used as a natural filler in poly- (hydroxybutyrate-co-valerate) (PHBV)-based composites. The morphology and the thermal properties of these com- posites were investigated by scanning electron microscopy and differential scanning calorimetry, respectively. Ligno- cellulosic fillers acted as nucleating sites for the crystalliza- tion of PHBV and strongly enhanced its degree of crystal- linity. Dynamic mechanical analysis and tensile properties of these materials were also studied. A significant reinforc- ing effect was displayed by dynamic mechanical analysis at temperatures higher than the glass-rubber transition of the matrix. In addition, for low-particle-size spruce, a stabiliza- tion of the modulus was observed up to 500 K. High-strain tensile properties did not show any reinforcing effect. This apparent disagreement was explained by the poor adhesion between the hydrophilic lignocellulosic filler and the hydro- phobic polymeric matrix. To validate this hypothesis, the experimental data were compared with predicted data in- volving the percolation concept. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1302-1315, 2003 |
| Databáze: | OpenAIRE |
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