SciELO - Scientific Electronic Library Online

 
vol.21 número4Assessment of physical, mechanical, and biological properties of bamboo plastic composite made with polylactic acidSelection of superior clones of Corymbia hybrids based on wood and charcoal properties índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Revista

Articulo

Indicadores

Links relacionados

  • En proceso de indezaciónCitado por Google
  • No hay articulos similaresSimilares en SciELO
  • En proceso de indezaciónSimilares en Google

Compartir


Maderas. Ciencia y tecnología

versión On-line ISSN 0718-221X

Resumen

ALTUNTAS, Ertugrul  y  AYDEMIR, Deniz. Effects of wood flour on the mechanical, thermal and morphological properties of poly (L-lactic acid)-chitosan biopolymer composites. Maderas, Cienc. tecnol. [online]. 2019, vol.21, n.4, pp.611-618. ISSN 0718-221X.  http://dx.doi.org/10.4067/S0718-221X2019005000416.

The aim of this paper was to investigate the effects of wood flour on the mechanical, morphological and thermal properties of poly (L-lactic acid) (PLA)-chitosan biopolymer composites produced by compression molding. The composites were characterized by a combination of mechanical properties, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The addition of chitosan to PLA matrix reduced the tensile strength from 57,1 MPa for pure PLA to 34,3 MPa for 5% chitosan and 11,5 MPa for 10% chitosan, and the flexure strength from 72,3 MPa for pure PLLA to 30,4 MPa for 5% chitosan and 24,6 MPa for 10% chitosan. The change trend in the young’s modulus was found to be similar as compare with the tensile strength. However, the flexure modulus generally increased with the addition of the chitosan as comparison with pure PLA. The mechanical properties of the PLA-chitosan blends with wood flour were found to be lower than theirs of the pure PLA. According to SEM images, some holes and small voids at various diameters on the fractured section of the all composites were seen. Tonset, T10%, T50%, T85% of the pure PLA decreased with the addition of both chitosan and wood flour. Thermal stability of the PLA-chitosan blends was determined to be better than the PLA-chitosan composites with wood flour.

Palabras clave : Bio-based composites; DSC analysis; mechanical properties; Pinus sylvestris; TGA analysis; wood flour..

        · texto en Inglés     · Inglés ( pdf )