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Properties of Wheat Gluten/Poly(lactic acid) Laminates
University of Borås, School of Engineering.
2010 (English)In: Journal of Agricultural and Food Chemistry, ISSN 0021-8561, E-ISSN 1520-5118, Vol. 58, no 12, 7344-7350 p.Article in journal (Refereed)
Abstract [en]

Laminates of compression-molded glycerol-plasticized wheat gluten (WG) films surrounded and supported by poly(lactic acid) (PLA) films have been produced and characterized. The objective was to obtain a fully renewable high gas barrier film with sufficient mechanical integrity to function in, for example, extrusioncoating paper/board applications. It was shown that the lamination made it possible to make films with a broad range of glycerol contents (0-30 wt.%) with greater strength than single unsupported WG films. The low plasticizer contents yielded laminates with very good oxygen barrier properties. In addition, whereas the unsupported WG films had an immeasurably high water vapor transmission rate (WVTR), the laminate showed values that were finite and surprisingly, in several cases, also lower than that of PLA. Besides being a mechanical support (as evidenced by bending and tensile data) and a shield between the WG and surrounding moisture, the PLA layer also prevented the loss of the glycerol plasticizer from the WG layer. This was observed after the laminate had been aged on an “absorbing” blotting paper for up to 17 weeks. The interlayer adhesion (peel strength) decreased with decreasing glycerol content and increasing WG film molding temperature (130 °C instead of 110 °C). The latter effect was probably due to a higher protein aggregation, as revealed by infrared spectroscopy. The lamination temperature (110-140 °C) did not, however, have a major effect on the final peel strength.

Place, publisher, year, edition, pages
American Chemical Society , 2010. Vol. 58, no 12, 7344-7350 p.
Keyword [en]
wheat gluten, polylactic acid, glycerol content, laminate, oxygen permeability, water vapor transmission rate, biopolymer
Keyword [sv]
Energi och material
National Category
Materials Engineering Polymer Chemistry
Identifiers
URN: urn:nbn:se:hb:diva-2975DOI: 10.1021/jf1003144Local ID: 2320/7339OAI: oai:DiVA.org:hb-2975DiVA: diva2:871069
Available from: 2015-11-13 Created: 2015-11-13

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