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Investigation of Physical Properties of Kafirin Films for Enviropak Application

Study on structure and material design of kafirin films, including characterization of fracture strength, thermomechanical properties, barrier properties, and microstructure using various plasticizers. Testing conducted on samples from CSIR and Sigma, comparing to thermoplastic films. Impact of processing temperatures on microstructure analyzed.

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Investigation of Physical Properties of Kafirin Films for Enviropak Application

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  1. Physical properties of kafirin films Enviropak final meeting Mats Stading Katarina Nilsson Susanna Edrud Siw Kidman Annika Altskär Paola Olofsson Maria Petersson SIK – The Swedish Institute for Food and Biotechnology Structure and Material Design Göteborg, Sweden

  2. Samples • Kafirin from CSIR large batch • Defatted zein from Sigma • Cast and thermoplastic films (from Sammy) • Plasticizer/protein: 0, 0.2, 0.3 and 0.4

  3. Characterization • Fracture strength (E, sb, eb) • Thermomechanical properties, DMA (G*, Tg) • Barrier properties (WVP, OP) • Moisture content • Microstructure (LM, CLSM, TEM)

  4. Plasticizers tested

  5. Stress at break sb [MPa] Ethanol Acetic acid Plasticizer/kafirin

  6. Strain at break eb [MPa] Ethanol Acetic acid Plasticizer/kafirin

  7. Moisture content MC [% w/w] Ethanol Acetic acid Plasticizer/kafirin

  8. Glass transition temperature ofkafirin and zein films Glycerol/PEG/la 1:1:1 Zein PEG LA PEG Kafirin Thermoplastic zein films from IMBC

  9. Water Vapour PermeabilityComparison with other materials WVP [g mm/m²h kPa] Whey protein glycerol Amylose Amylopectin glycerol sorbitol EVOH LDPE 0.4 0.48 0.83 Plasticizer/kafirin

  10. LDPE 1900 UP kafirin preparation Whey protein glycerol Amylose Amylopectin glycerol EVOH sorbitol 0.4 0.3 0.83 Oxygen Permeability OP [cm³ mm/m² d kPa] Plasticizer/kafirin

  11. Ethylene Permeability

  12. Thermoplastic zein films 25% PEG400, 50rpm, 60°C, 600s Micropores 0.1mm Fine structures of zein films 1mm Processing temperatures (60°C, 70°C,80°C) do not seem to change themicrostructure of the thermoplastic films 1mm

  13. Thermoplastic kafirin films 60°C 80°C Observations Bigger micropores at higher processing temperature Less striated structure at higher processing temperature  more even melting No microstructural difference between lauric acid and PEG plasticization 20mm 20mm 1mm 1mm

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