Erschienen in:Journal of Thermoplastic Composite Materials
Sprache:
Englisch
DOI:
10.1177/0892705714526916
ISSN:
0892-7057;
1530-7980
Entstehung:
Anmerkungen:
Beschreibung:
<jats:p> Hybrid composites composed of polypropylene (PP) or high-density polyethylene (HDPE), different flax fibers (unidirectional, biaxial, and twill<jats:sub>2 × 2</jats:sub>), and silicon dioxide (SiO<jats:sub>2</jats:sub>) were produced by hot-press technique. The ternary polymer composite was effectively fabricated by spraying SiO<jats:sub>2</jats:sub> solvents onto the surface of flax fiber. The dispersion of SiO<jats:sub>2</jats:sub> particles and flax in the composites was studied by scanning electron microscopy. The related PP- and HDPE-based composites were subjected to instrumented falling weight impact test. The thermal and mechanical properties of the composites were determined by thermogravimetric analysis, dynamic mechanical thermal analysis, creep and stress relaxation tests, respectively. It was found that thermal decomposition temperature of the PP or HDPE/flax composites increased by the addition of SiO<jats:sub>2</jats:sub> particles. The impact energy, stiffness, creep resistance, and relaxation modulus value of all flax composites increased markedly compared with the PP and HDPE matrix. Time–temperature superposition was applied to estimate the creep and relaxation modulus of the composites as a function of time in the form of a master curve. The activation energies for all the PP and HDPE composites systems studied were also calculated using the Arrhenius equation. The generalized Maxwell model was fairly applicable to the stress relaxation results. </jats:p>