Improving the physical properties of starch using a new kind of water dispersible nano-hybrid reinforcement

MORALES, NOE; CANDAL, ROBERTO J; FAMA, LUCIA; GOYANES SILVIA; GERARDO H. RUBIOLO

CARBOHYDRATE POLYMERS

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2015 vol. 127 p. 291 - 299

0144-8617

Plasticized cassava starch matrix composites reinforced by a multi-wall carbon nanotube (MWCNT)?hercynite (FeAl2O4) nanomaterial were developed. The hybrid nanomaterial consists of FeAl2O4 nanoparticles anchored strongly to the surface of the MWCNT. This nano-hybrid filler shows an irregular geometry, which provides a strong mechanical interlocking with the matrix, and excellent stability in water, ensuring a good dispersion in the starch matrix. The composite containing 0.04 wt.% of the nano-hybrid filler displays increments of 370% in the Young?s modulus, 138% in tensile strength and 350% in tensile toughness and a 70% decrease in water vapor permeability relative to the matrix material.All of these significant improvements are explained in terms of the nano-hybrid filler homogenous dispersion and its high affinity with both plasticizers, glycerol and water, which induces crystallization without deterioration of the tensile toughness.