Effect of plasticiser on the morphology, mechanical properties and permeability of albumen-based nanobiocomposites
| Autor: | Perla A. Gómez, Isabel Diañez, Inmaculada Martínez |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Microbiology (medical) Materials science Polymers and Plastics Plasticizer 04 agricultural and veterinary sciences Polyethylene glycol 040401 food science 01 natural sciences Exfoliation joint Biomaterials chemistry.chemical_compound 0404 agricultural biotechnology Montmorillonite Rheology chemistry 010608 biotechnology Ultimate tensile strength Thermomechanical processing Composite material Safety Risk Reliability and Quality Glass transition Food Science |
| Zdroj: | Food Packaging and Shelf Life. 24:100499 |
| ISSN: | 2214-2894 |
| DOI: | 10.1016/j.fpsl.2020.100499 |
| Popis: | This paper delves into the role plasticisers play in the formulation and processing of bioplastics and nanobiocomposites, trying to understand their effect on nanoclays dispersion and, consequently, on mechanical and gas barrier properties of protein-based nanobiocomposites. Egg white protein/montmorillonite clay nanobiocomposites were obtained by thermomechanical processing plasticised with varying molar concentration of different components (water, glycerol, polyethylene glycol). The extent of dispersion of the filler was evaluated by X-ray diffraction and transmission electron microscopy. Tensile tests and solid-state rheological measurements were conducted to evaluate glass transition temperature and thermomechanical behaviour of plasticised protein-clay nanobiocomposites, whereas gas permeability tests were used to study their gas barrier properties. The results showed that the samples plasticised by a blend of 1:1 glycerol/water presented the most exfoliated structures, resulting in an improvement in gas barrier and mechanical properties. Morphological analyses combined with tensile and permeability tests have shown a lesser effect of polyethylene glycol of 300 molecular weight (PEG 300) on the exfoliation extent into such nanobiocomposites. Moreover, the larger size of PEG 300 does not allow the formation of a structure as compact as in the case of water and glycerol, as a consequence of an apparent phase separation, leaving more spaces that facilitate the diffusion of gases through the material. |
| Databáze: | OpenAIRE |
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