Barrier Properties of Polylactic Acid in Cellulose Based Packages Using Montmorillonite as Filler
Daniela Sánchez Aldana,
Eduardo Duarte Villa,
Miguel De Dios Hernández,
Guillermo González Sánchez,
Quintín Rascón Cruz,
Sergio Flores Gallardo,
Hilda Piñon Castillo,
Lourdes Ballinas Casarrubias
Affiliations
Daniela Sánchez Aldana
Ciencias Químicas, Universidad Autónoma de Chihuahua, Circuito Universitario s/n, Campus Universitario No. 2, C.P. 31125, Chihuahua, Chih., Mexico
Eduardo Duarte Villa
Grupo COPAMEX, Ave. de la Juventud No. 280, C.P. 66450, San Nicolás de los Garza, N.L., Mexico
Miguel De Dios Hernández
Grupo COPAMEX, Ave. de la Juventud No. 280, C.P. 66450, San Nicolás de los Garza, N.L., Mexico
Guillermo González Sánchez
Centro de Investigación en Materiales Avanzados, S.C., Laboratorio Nacional de Nanotecnología, Miguel de Cervantes No. 120, C.P. 31109, Chihuahua, Chih., Mexico
Quintín Rascón Cruz
Ciencias Químicas, Universidad Autónoma de Chihuahua, Circuito Universitario s/n, Campus Universitario No. 2, C.P. 31125, Chihuahua, Chih., Mexico
Sergio Flores Gallardo
Centro de Investigación en Materiales Avanzados, S.C., Laboratorio Nacional de Nanotecnología, Miguel de Cervantes No. 120, C.P. 31109, Chihuahua, Chih., Mexico
Hilda Piñon Castillo
Centro de Investigación en Materiales Avanzados, S.C., Laboratorio Nacional de Nanotecnología, Miguel de Cervantes No. 120, C.P. 31109, Chihuahua, Chih., Mexico
Lourdes Ballinas Casarrubias
Ciencias Químicas, Universidad Autónoma de Chihuahua, Circuito Universitario s/n, Campus Universitario No. 2, C.P. 31125, Chihuahua, Chih., Mexico
Polylactic acid (PLA) and montmorillonite (CB) as filler were studied as coatings for cellulose based packages. Amorphous (AM) and semi crystalline (SC) PLA were used at different concentrations according to a 2 × 6 × 3 full factorial experimental design. CB loading was three concentrations and coating was performed by casting. Contact angle (CA), water vapor (WVP) and grease permeabilities were measured for each resultant package and were compared to commercial materials (Glassine Paper, Grease Proof Papers 1 and 2 produced commercially). Significant differences were found and the main factors were the type and concentration of PLA. The best values were: for grease penetration, +1800 s; WVP from 161.36 to 237.8 g·µm·kPa−1·m−2·d−1 and CA from 69° to 73° for PLA–AM 0.5% and CB variable. These parameters are comparable to commercial packages used in the food industry. DSC revealed three different thermal events for PLA–SC and just Tg for PLA–AM. Crystallinity was also verified, obtaining a ΔHcrys of 3.7 J·g−1 for PLA–SC and 14 J·g−1 for PLA–SC–BC, evidencing clay interaction as a crystal nucleating agent. Differences found were explained on terms of the properties measured, where structural and chemical arrays of the coatings play a fundamental role for the barrier properties.
