Biodegradation Behaviour of Thermoplastic Starch: The Roles of Carboxylic Acids on Cassava Starch

Zain, Amirah Hulwani Mohd; Wahab, Mohamad Kahar Ab; Ismail, Hanafi

doi:10.1007/s10924-017-0978-5

Cited by 58 publications

(23 citation statements)

References 9 publications

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“…Studies on films with a starch content of 85% show slow degradation in seawater [ 93 , 94 ], but the period of about half a year for seawater degradation is comparatively short. The degradation in soil takes place much faster; in [ 95 ] and [ 96 ], a total mass loss of 100% and 72.6%, respectively, was measured after 30 days at temperatures of 30 and 25 °C. It is interesting to note that, under industrial composting conditions, only a total mass loss of 45% was detected after 49 days [ 90 ].…”

Section: Polymersmentioning

confidence: 99%

Review on the Biological Degradation of Polymers in Various Environments

2020

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Biodegradable plastics can make an important contribution to the struggle against increasing environmental pollution through plastics. However, biodegradability is a material property that is influenced by many factors. This review provides an overview of the main environmental conditions in which biodegradation takes place and then presents the degradability of numerous polymers. Polylactide (PLA), which is already available on an industrial scale, and the polyhydroxyalkanoates polyhydroxybutyrate (PHB) and polyhydroxybutyrate-co-valerate (PHBV), which are among the few plastics that have been proven to degrade in seawater, will be discussed in detail, followed by a summary of the degradability of further petroleum-, cellulose-, starch-, protein- and CO2-based biopolymers and some naturally occurring polymers.

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Section: Polymersmentioning

confidence: 99%

Review on the Biological Degradation of Polymers in Various Environments

2020

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“…Bio‐based polymers are derived from natural resources and are, with some exceptions, completely biodegradable, reason for which they have been proposed as a potential solution to the accumulation of plastic waste in the environment . Starch stands out among bio‐based polymers due to its high availability, low cost, renewability, and easy processing to obtain biodegradable thermoplastic starch (TPS) films . TPS films could be used as agricultural mulch films nonetheless some limitations caused by starch intrinsic hydrophilicity and brittleness must be solved .…”

Section: Introductionmentioning

confidence: 99%

“…Starch stands out among bio‐based polymers due to its high availability, low cost, renewability, and easy processing to obtain biodegradable thermoplastic starch (TPS) films . TPS films could be used as agricultural mulch films nonetheless some limitations caused by starch intrinsic hydrophilicity and brittleness must be solved . Several technological alternatives have been proposed in literature to solve these problems such as (1) chemically modify the structure of the starch by introducing new functional groups, which improve intramolecular interactions among the film constituents, thus avoiding or reducing at least partly water absorption and starch retrogradation and (2) adding micro‐ or nanoreinforcements …”

Section: Introductionmentioning

confidence: 99%

Structural and Thermal Properties of Agricultural Mulch Films Based on Native and Oxidized Corn Starch Nanocomposites

2019

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The current need to put an end to the accumulation of synthetic polymer waste during the cultivation and harvest of food has promoted scientific research for the development of biodegradable agricultural mulch films. Native and oxidized thermoplastic corn starch, with and without the addition of natural and modified bentonite (Bent) with an eco‐friendly natural polymer such as chitosan (CS) are proposed as an alternative for this field. The hydrogen‐bonding interactions affecting the structural and thermal properties of the designed films are followed and analyzed by Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and rheometry. Results indicate that chemical modification carried out onto starch's structure leads to a reduction in the OH polar groups, which affects their films interaction with nano‐clays and glycerol. Besides, nanocomposites which present an intercalated structure demonstrate less effective intercalation when oxidized starch is used as the matrix. Additionally, a higher degree of crystallinity is observed, which could indicate a lower degree of compatibility between polymer and plasticizer. Thermal characterization confirms that the glass transition temperature of plasticized corn starch increases when oxidation is performed due to the decreased compatibility between the plasticizer agent and the oxidized corn starch.

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“…As observed by X-ray diffraction, GO was well-dispersed within starch matrix and the exfoliated sheets acted as a barrier for water permeation in this first stage. For TPS, the primary degradation stage was associated with leaching of glycerol from the starch matrix [39]. Within 45 days of incubation, the TPS/GO composites already show mass loss, which was more pronounced with the increase in GO mass content.…”

Section: Resultsmentioning

confidence: 99%

Physical and Biodegradation Properties of Graphene Derivatives/Thermoplastic Starch Composites

Ferreira

Andrade

2021

Polysaccharides

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Development of biodegradable materials for packaging is an issue of the utmost importance. These materials are an alternative to petroleum-based polymers, which contribute to environment pollution after disposal. In this work, graphene oxide (GO) and glucose-reduced graphene oxide (rGO-g) were incorporated to thermoplastic starch (TPS) by melt extrusion. The TPS/GO and TPS/rGO-g composites had their physical properties and biodegradability compared. X-ray diffraction (XRD) showed that the type of graphene used led to different dispersion levels of graphene sheets, and to changes in the crystalline structure of TPS. Tensile tests carried out for the compression-molded composites indicated that TPS/rGO-g composites presented better mechanical performance. The Young’s modulus (E) increased from E = (28.6 ± 2.7) MPa, for TPS, to E = (110.6 ± 9.5) MPa and to (144.2 ± 11.2) MPa for TPS with rGO-g incorporated at 1.0 and 2.0 mass% content, respectively. The acid groups from graphene derivatives promoted glycosidic bond breakage of starch molecules and improved biodegradation of the composites. GO is well-dispersed in the TPS matrix, which contributes to biodegradation. For TPS/rGO-g materials, biodegradation was influenced by rGO-g dispersion level.

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Biodegradation Behaviour of Thermoplastic Starch: The Roles of Carboxylic Acids on Cassava Starch

Cited by 58 publications

References 9 publications

Review on the Biological Degradation of Polymers in Various Environments

Review on the Biological Degradation of Polymers in Various Environments

Structural and Thermal Properties of Agricultural Mulch Films Based on Native and Oxidized Corn Starch Nanocomposites

Physical and Biodegradation Properties of Graphene Derivatives/Thermoplastic Starch Composites

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