Rheology and sheet extrusion of Novatein thermoplastic protein/polybutylene adipate‐co‐terephthalate blends

ABSTRACT Novatein is a thermoplastic polymer made from blood meal proteins, but it has rheological properties very different from commodity thermoplastics. Capillary rheometry revealed an apparent time dependent shear viscosity for Novatein, evident from a decreasing pressure drop over time, measure...

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Bibliographic Details
Published in:Journal of applied polymer science 2019-10, Vol.136 (38), p.n/a
Main Authors: Verbeek, Casparus J.R., Smith, Matthew J., Cozens, Wade C.
Format: Article
Language:English
Subjects:
biopolymers and renewable polymers
Compatibility
Extrusion
Materials science
morphology
Polymer blends
Polymers
Pressure drop
Proteins
Rheological properties
Rheology
Rheometry
Shear rate
Shear viscosity
Solid phases
Terephthalate
Thermoplastic resins
thermoplastics
Time dependence
Viscosity
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Summary:ABSTRACT Novatein is a thermoplastic polymer made from blood meal proteins, but it has rheological properties very different from commodity thermoplastics. Capillary rheometry revealed an apparent time dependent shear viscosity for Novatein, evident from a decreasing pressure drop over time, measured at constant shear rate. However, blending with polybutylene adipate‐co‐terephthalate (PBAT) reduced the time dependence for uncompatibilized blends and virtually eliminated time dependence for compatibilized blends containing 30 wt % PBAT. Novatein's extensional viscosity is three orders of magnitude more than its shear viscosity and explained the difficulty in sheet extrusion. In contrast, 30% compatibilized blends had an extensional viscosity similar to neat PBAT and was also the only blend that could be successfully sheet extruded. Although uncompatibilized blends at the same or lower PBAT content also had a lower extensional viscosity, they could not be sheet extruded and the difference was the 30% compatibilized blends had a fine PBAT phase structure (co‐continuous in this case), which was sufficiently adhered to the Novatein phase. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47977.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.47977