Evaluation of mechanical properties of poly (lactic acid)/cellulose nanocrystal nanocomposites : A comparative study of conventional tensile test and small punch test

  1. Singh, Shikha
  2. Rodriguez, C. 1
  3. Santana, O.
  4. Oksman, Kristiina
  5. Maspoch, M. Ll.
  1. 1 Universidad de Oviedo
    info

    Universidad de Oviedo

    Oviedo, España

    ROR https://ror.org/006gksa02

Actas:
Congreso del Grupo Español de Fractura 2019 (GEF2019)

Editorial: Grupo Español de fractura (GEF)

Año de publicación: 2019

Páginas: 226-231

Congreso: Congreso del Grupo Español de Fractura 2019 (GEF2019) (2019. Sevilla, España)

Tipo: Aportación congreso

GOOGLE SCHOLAR lock_openAcceso abierto editor

Resumen

Polylactic acid (PLA) has gained much attention due to its potential to substitute some of the oil-based polymers, however,it has some drawbacks which restrict its use. One way to improve the mechanical and thermal properties of PLA is byadding nanofillers such as cellulose nanocrystals (CNC).The dispersion of the CNC in the PLA matrix is quite challenging because CNC has a tendency to agglomerate. In thiswork, CNC was well dispersed in the PLA matrix using ultrasonication and stirring. Furthermore, surface modificationof CNC was done by ring opening polymerization (ROP) technique to facilitate the dispersion. Then, the microspheresof PLA/CNC (1wt%) was prepared with liquid nitrogen for easy processing. Finally, nanocomposite films were preparedby extrusion calendering.The main objective of this research is to see if there is any reinforcing effect of CNC on mechanical properties of PLA.Mechanical properties of PLA/CNC nanocomposites were evaluated by tensile testing and dynamic mechanical thermalanalysis (DMTA) and compared with the small punch test (SPT).