Effect of plasticizer and storage conditions on thermomechanical properties of albumen/tragacanth based bioplastics
作者： María Luisa López-Castejón , Carlos Bengoechea , Moisés García-Morales , Inmaculada Martínez
DOI: 10.1016/J.FBP.2014.11.002
关键词: Polymer chemistry 、 Tragacanth 、 Dynamic mechanical analysis 、 Composite material 、 Moisture 、 Relative humidity 、 Materials science 、 Plasticizer 、 Ultimate tensile strength 、 Modified atmosphere 、 Bioplastic
摘要: Abstract The effects of composition the plasticizer fraction and storage conditions on physical thermomechanical properties egg albumen/tragacanth gum based bioplastics were studied. Thus, glycerol ( G ) water W used as plasticizers at different / ratios (1:0, 3:1, 1:1, 1:3, 0:1), keeping biopolymer always 60% (w/w). Tragacanth was included in formulation for its well-known hydrophilic character, possible future applications these may be moisture dependent (e.g. modified atmosphere packaging). Moreover, stored room temperature under no control relative humidity those obtained when equilibrated a 53% (RH) atmosphere. This is reflected DMTA tensile tests results, which loss samples with highest contents (1:3, 0:1) involves very significant increases viscoelastic moduli strength RH. Glycerol presence RH taken promotes uptake, probably due to an interaction between both plasticizers, eventually lead greater plastic region tests.
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