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Published byMary Hodges Modified over 9 years ago
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Film Casting Formulation and method: Heat 7g absolute ethanol (70 °C), add 1.6g (90%w/w) protein, stir until dissolved. Add 2g distilled water, stir, then add 0.6g plasticizer mixture (1 PEG: 1 glycerol: 1 lactic acid), stir for a further 4 minutes (makes 2 films). Method of casting: 4g casting solution is placed in a petri dish and left overnight on a level surface to set. Final film weight = approx 0.8g.
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Film Quality Attributes Tensile properties Water Vapour Transmission
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Tensile properties Measure force at break Calculate stress Measure extended distance at break Calculate strain Plot stress against strain Zein 95 Zein 70
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Water Vapour Transmission Measure water loss (g) through film with time over a period of 5 days (no control of temperature and Relative Humidity) Calculate Water Vapour Transmission
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