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  • Micro-structural characterisation of homogeneous and layered MFC nano-composites.

Micro-structural characterisation of homogeneous and layered MFC nano-composites.

Micron (Oxford, England : 1993) (2012-09-18)
Gary Chinga-Carrasco, Natalia Averianova, Marat Gibadullin, Vladimir Petrov, Ingebjørg Leirset, Kristin Syverud
ABSTRACT

The complementary capabilities of various characterisation methods for micro-structural assessment are demonstrated. The assessed structures were composed of unbleached microfibrillated cellulose (MFC) in combination with bleached and 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO) pre-treated MFC materials. The biodegradable nano-composites were thus characterised in detail, including laser profilometry, scanning electron microscopy (SEM) in high and low vacuum modes, and field-emission SEM. The distribution of the unbleached MFC materials was assessed by staining the unbleached MFC with osmium tetroxide (OsO(4)), which reacts with C=C double bonds encountered in lignin. In addition, some properties of the MFC nano-composite films were tested, i.e. tensile properties, water wettability and oxygen permeability. In general, the group of characteristics of the nano-composite MFC films was better than the properties of the films made of the neat MFC qualities. This indicates that mixing complementary MFC qualities could give synergetic effects that are not exploited completely when using the MFC qualities separately. The study thus confirms the suitability of unbleached MFC materials as a component in multilayer structures, for example biodegradable packaging applications.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Osmium tetroxide, ReagentPlus®, 99.8%
Sigma-Aldrich
Osmium tetroxide solution, 2.5 wt. % in tert-butanol
Sigma-Aldrich
Osmium tetroxide solution, 4 wt. % in H2O
Sigma-Aldrich
Osmium tetroxide, ACS reagent, ≥98.0%
Sigma-Aldrich
Osmium tetroxide solution, suitable for electron microscopy, 4% in H2O
Sigma-Aldrich
Osmium tetroxide solution, suitable for electron microscopy, 2% in H2O
Sigma-Aldrich
Osmium tetroxide, Sealed ampule.
Sigma-Aldrich
TEMPO, 98%
Sigma-Aldrich
TEMPO, purified by sublimation, 99%
Sigma-Aldrich
Os EnCat® 40, extent of labeling: 0.3 mmol/g Os loading