Fabrication and properties of thermoplastic starch/montmorillonite composite using dialdehyde starch as a crosslinker

The poor mechanical properties and high water solubility of biodegradable thermoplastic starch (TPS) represent the main disadvantages of TPS in many applications. In this work, TPS film was prepared from a water solution of corn starch modified by 5 wt% dialdehyde starch (DAS) as crosslinking agent...

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Bibliographic Details
Published in:Polymer international 2020-03, Vol.69 (3), p.317-327
Main Authors: Peidayesh, Hamed, Ahmadi, Zahed, Khonakdar, Hossein Ali, Abdouss, Majid, Chodák, Ivan
Format: Article
Language:English
Subjects:
Biodegradability
Crosslinking
dialdehyde starch
Fourier analysis
Fourier transforms
Glycerol
Hydrogen bonds
Hydroxyl groups
Infrared analysis
Infrared spectroscopy
Mechanical properties
Modulus of elasticity
Montmorillonite
Organic chemistry
Raman spectroscopy
Spectrum analysis
Starch
Stiffness
Storage modulus
Tensile strength
Thermal analysis
thermoplastic starch
Water resistance
Weight loss
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Summary:The poor mechanical properties and high water solubility of biodegradable thermoplastic starch (TPS) represent the main disadvantages of TPS in many applications. In this work, TPS film was prepared from a water solution of corn starch modified by 5 wt% dialdehyde starch (DAS) as crosslinking agent and 3 wt% montmorillonite (MMT) as reinforcing additive. Interactions occurring in the TPS films were investigated by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, XRD, DSC, dynamic mechanical thermal analysis (DMTA) and TGA. The results obtained fom FTIR spectroscopy and DSC suggest the formation of hydrogen bond interactions between the hydroxyl group of starch, DAS, the MMT layers and glycerol. DMTA indicated that the relaxation of films with DAS and MMT appears in a higher and broader temperature range due to the starch backbone stiffness; the extreme increase in the storage modulus confirmed the suggested interactions. The determination of the weight loss of the films in water indicated a significant increase of the water resistance of TPS due to incorporation of DAS and MMT. Changes in mechanical properties of the films containing DAS and clay were determined, showing a substantial increase in tensile strength from 2.7 to 6.7 MPa, while Young's modulus increased by 15 times for TPS modified with 5% DAS and 3% MMT. Therefore, the outcomes of this study confirmed that DAS is a suitable biomacromolecule crosslinker for starch and can significantly enhance TPS and TPS/MMT properties. © 2019 Society of Chemical Industry Thermoplastic starch film was modified by dialdehyde starch and montmorillonite, whereby interactions between the starch, dialdehyde starch, the montmorillonite layers and glycerol occurred leading to significant changes in properties.
ISSN:0959-8103
1097-0126
DOI:10.1002/pi.5955