Preparation and evaluation of the barrier properties of cellophane membranes modified with fatty acids

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

Tomé, L.C. (Autor) Outra; Gonçalves, C.M.B. (Autor) Outra; Boaventura, M. (Autor) FEUP; Brandão, L. (Autor) FEUP; Mendes, A. M. (Autor) FEUP; Silvestre, A. (Autor) Outra; Neto, C. (Autor) Outra; Gandini, A. (Autor) Outra; Freire, C. (Autor) Outra; Marrucho, I. (Autor) Outra

Revista

Título: Carbohydrate Polymers

Vol. 83 Nº 2

Páginas: 836-842

ISSN: 0144-8617

Editora: Elsevier

Indexação

ISI Web of Knowledge - 39 Citações

ISI Web of Science

Scopus - 40 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Outras ciências da engenharia e tecnologias

Outras Informações

ID Authenticus: P-002-VVY

DOI: 10.1016/j.carbpol.2010.08.060

Abstract (EN): Cellophane (regenerated cellulose) membranes with tailored properties regarding hydrophobic character and barrier effects were prepared by their controlled heterogeneous esterification with two fatty acid derivatives (hexanoyl and dodecanoyl chlorides) The characterization of the modified membranes was performed by FUR spectroscopy X-ray diffraction and thermogravimetry confirming the success of the heterogeneous modification reaction while keeping cellophane membranes structural properties Contact angle measurements clearly confirm the enhanced hydrophobic character displayed by the modified cellophane membranes The evaluation of their barrier properties was carried out by determining the permeability towards water vapor at different relative humidities and the permeability towards nitrogen oxygen and carbon dioxide using the time-lag method in both wet and dry states A decrease in both the water permeation and the permeability towards these gases in the wet state was observed for the modified membranes No significant differences in behavior were found between the membranes prepared with hexanoyl and dodecanoyl chloride regarding hydrophobicity but the different lengths of the chain allowed a fine tune of the permeability The obtained cellophane membranes are a good example of the development of new bio-based materials with improved surface and barrier properties

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Notas: Publicação abrangida pelo Journal Citation Reports 2015

Nº de páginas: 7