Viscous Properties of Thermoplastic Starches from Different Botanical Origin
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G. Della Valle
Abstract
Starches from various botanical origins were plasticized in a twin screw extruder with different glycerol contents (from 23 to 32%, total wet basis) in order to prepare pellets of amorphous thermoplastic starches (TPS) that can further be processed for manufacturing purposes. The viscous behaviour of these starches was studied with a capillary pre-shearing rheometer, which achieved an homogeneous molten phase under controlled thermomechanical conditions. After performing Bagley corrections and Rabinowitsch analysis, it was found that all samples exhibited a non-Newtonian shear-thinning behaviour, which could be modeled in the range 1 to 103 s−1 either by a simple power law or by a Herschel-Bulkley relationship. For the consistency index, the influence of temperature and plasticizer content was accounted for by Arrhenius-like laws, applying time-temperature and time-plasticizer superposition. For the same plasticizer content and temperature, comparison of starches from different botanical origins showed that shear viscosity values usually increased with the starch amylose content. This trend was partly confirmed for the elongational behaviour, estimated by the Cogswell's analysis of entrance effects. These results can be interpreted by the greater ability of linear molecules of amylose to entangle, compared to the more compact amylopectin molecules.
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© 2007, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Editorial
- Special Issue on Biobased Polymers
- Invited Papers
- Crystallization and Mechanical Propertiesof Poly (D, L) Lactide-based Blown Films
- Rheological Behavior and Modeling of Thermal Degradation of Poly(∊-Caprolactone) and Poly(L-Lactide)
- Rheological Evaluation and Observations of Extrusion Instabilities of Biodegradable Polyesters
- Biaxial Orientation of Polylactide/Thermoplastic Starch Blends
- Effects of Starch Types on Mechanical Properties of Poly(lactic acid)/Starch Composites
- Solid and Microcellular Polylactide-Carbon Nanotube Nanocomposites
- Tapioca Starch-poly (lactic acid)-based Nanocomposite Foams as Affected by Type of Nanoclay
- Injection Molded Solid and Microcellular Polylactide Compounded with Recycled Paper Shopping Bag Fibers
- Fabrication of Porous 3-D Structure from Poly(L-lactide)-based Nanocomposite Foam via Enzymatic Degradation
- The Linear Viscoelastic Behavior of a Series of 3-Hydroxybutyrate-based Copolymers
- New Developments in Biodegradable Starch-based Nanocomposites
- Viscous Properties of Thermoplastic Starches from Different Botanical Origin
- Thermoplastic Foams from Zein and Gelatin
- Improvement of the Mechanical Properties of Soy Protein Isolate Based Plastics through Formulation and Processing
- Biocomposites Based on Bacterial Cellulose and Apple and Radish Pulp
- Preparation and Properties of Metallocene-catalyzed PE/Starch Nanocomposites: Role of Nanocompatibilizer
- Evaluation of Properties and Biodeterioration Potential of Polyethylene and Aliphatic Polyester Blends
- PPS News
- PPP News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
Articles in the same Issue
- Contents
- Contents
- Editorial
- Special Issue on Biobased Polymers
- Invited Papers
- Crystallization and Mechanical Propertiesof Poly (D, L) Lactide-based Blown Films
- Rheological Behavior and Modeling of Thermal Degradation of Poly(∊-Caprolactone) and Poly(L-Lactide)
- Rheological Evaluation and Observations of Extrusion Instabilities of Biodegradable Polyesters
- Biaxial Orientation of Polylactide/Thermoplastic Starch Blends
- Effects of Starch Types on Mechanical Properties of Poly(lactic acid)/Starch Composites
- Solid and Microcellular Polylactide-Carbon Nanotube Nanocomposites
- Tapioca Starch-poly (lactic acid)-based Nanocomposite Foams as Affected by Type of Nanoclay
- Injection Molded Solid and Microcellular Polylactide Compounded with Recycled Paper Shopping Bag Fibers
- Fabrication of Porous 3-D Structure from Poly(L-lactide)-based Nanocomposite Foam via Enzymatic Degradation
- The Linear Viscoelastic Behavior of a Series of 3-Hydroxybutyrate-based Copolymers
- New Developments in Biodegradable Starch-based Nanocomposites
- Viscous Properties of Thermoplastic Starches from Different Botanical Origin
- Thermoplastic Foams from Zein and Gelatin
- Improvement of the Mechanical Properties of Soy Protein Isolate Based Plastics through Formulation and Processing
- Biocomposites Based on Bacterial Cellulose and Apple and Radish Pulp
- Preparation and Properties of Metallocene-catalyzed PE/Starch Nanocomposites: Role of Nanocompatibilizer
- Evaluation of Properties and Biodeterioration Potential of Polyethylene and Aliphatic Polyester Blends
- PPS News
- PPP News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts