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The effect of plasticizers on thermoplastic starch films developed from the indigenous Ethiopian tuber crop Anchote (Coccinia abyssinica) starch
- Source :
- Int J Biol Macromol
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Anchote (Coccinia abyssinica) starch films were prepared by a solution casting method with glycerol, 1-ethyl-3-methylimidazolium acetate, sorbitol or triethylene glycol as plasticizers. The effect of these plasticizers and their concentration on film microstructure, thermal, and mechanical properties was investigated. Scanning electron microscopy revealed that regardless of plasticizer type, films possessing higher plasticizer content had more homogeneous morphologies than those with lower plasticizer content. The FTIR spectra of films plasticized with 1-ethyl-3-methylimidazolium acetate had higher intensity peaks at 3150, 1400 and 1000 cm−1 when compared to other film peaks. These data show that 1-ethyl-3-methylimidazolium acetate plasticized films have decreased molecular order which results in less hydrogen bonding. For this reason, films developed from 1-ethyl-3-methylimidazolium acetate were more flexible than the others. The effect of plasticizers on the thermal properties of the anchote starch films was investigated using thermogravimetric analysis (TGA). Films made from 30% (w/w) plasticizer concentration exhibited higher thermal stability for all types of plasticizer. Mechanical testing showed that sorbitol films had the highest tensile strength, approximately 2 times that of the triethylene glycol plasticized film and 3 times that of the film made from 1-ethyl-3-methylimidazolium acetate.
- Subjects :
- Glycerol
Thermogravimetric analysis
Materials science
Coccinia abyssinica
Thermoplastic
Starch
02 engineering and technology
Biochemistry
Article
03 medical and health sciences
chemistry.chemical_compound
Plasticizers
Structural Biology
Tensile Strength
Sorbitol
Thermal stability
Molecular Biology
030304 developmental biology
Triethylene glycol
chemistry.chemical_classification
0303 health sciences
Imidazoles
Plasticizer
General Medicine
021001 nanoscience & nanotechnology
Microstructure
Cucurbitaceae
Plant Tubers
chemistry
0210 nano-technology
Nuclear chemistry
Subjects
Details
- ISSN :
- 01418130
- Volume :
- 155
- Database :
- OpenAIRE
- Journal :
- International Journal of Biological Macromolecules
- Accession number :
- edsair.doi.dedup.....950893efeccc727a7adf2192d76bb90b