Journal
FOOD HYDROCOLLOIDS
Volume 48, Issue -, Pages 84-93Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2015.01.008
Keywords
Crystallization; Glass transitions; Mechanical properties; Water vapour permeability; Microstructure; Polymer blends
Categories
Funding
- Spanish Ministerio de Economia y Competitividad [AGL2010-20694]
- FEDER
- Spanish Ministerio de Educacion, Cultura y Deporte
- [COST-STSM-FA1001-14253]
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Pea starch (S) and poly(vinyl alcohol) (PVA) blends with different ratios were produced in order to elucidate the possible advantages of blend films to overcome the common drawbacks of starch films. Starch, poly(vinyl alcohol) and blends (S: PVA ratios of 2:1, 1:1 and 1:2) were obtained by casting and microstructure and thermal behaviour were characterized. Moreover, barrier, mechanical and optical properties were evaluated after 1 and 5 storage weeks at 25 degrees C and 53% relative humidity in order to study the effect of poly(vinyl alcohol) on the ageing process of starch. The incorporation of PVA into pea starch films implied the formation of interpenetrated networks of both incompatible polymers with partial solubilisation. S-PVA blend films were much more extensible and stable during storage, with improved water barrier properties and reduced water sorption capacity especially when the S: PVA ratio were 1:1 and 1:2. Starch-poly(vinyl alcohol) blend films are environmentally friendly, low cost materials, with good functional properties. (C) 2015 Elsevier Ltd. All rights reserved.
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