Preparation of native cassava starch and cross‐linked starch blended foams

Pornsuksomboon, Kanlaya; Szécsényi, Katalin Mészáros; Holló, Berta Barta; Kaewtatip, Kaewta

doi:10.1002/star.201400031

Cited by 13 publications

(4 citation statements)

References 21 publications

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“…Starch and its derivatives have attracted many researchers for expanding biopolymer industries since they are cost‐effective, renewable, abundant in nature, and biodegradable . However, some limitations exist in the properties of starch including poor mechanical properties, high hydrophilicity, fragility, and poor dimensional stability .…”

Section: Introductionmentioning

confidence: 99%

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Peidayesh

Ahmadi

Khonakdar

et al. 2020

Polymers for Advanced Techs

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Citric acid (CA)-modified hydrogels from corn starch and chitosan were synthesized using a semidry condition. This strategy has great benefits of friendly environment because of the absence of organic solvents and compatible with the industrial process. The hydrogel blends were prepared with starch/chitosan ratios of 75/25, 50/50, and 25/75. The thermal stability, morphology, water absorption, weight loss in water, and methylene blue absorption were determined. Multi-carboxyl structure of CA could result in a chemical cross-linking reaction between starch, chitosan, and CA. The cross-linking reaction between free hydroxyl groups of starch, amino groups of chitosan, and carboxyl groups of CA has been confirmed by attenuated total reflectance infrared (ATR-IR) spectroscopy, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) analysis. The water absorption properties of CA-modified hydrogel blends were increased significantly compared with the native starch and chitosan. Moreover, the hydrogel blends modified with CA showed good water resistance and gel content. The morphology study confirmed the complete chemical cross-linking and porous structure of hydrogel blends. The hydrogel blend with the starch/chitosan ratio of 50/50 presented powerful absorption of methylene blue as well as chemical cross-linking reaction and dense structure. In sum, the hydrogel blend comprising 50% starch and 50% chitosan has the potential to be applied for water maintaining at large areas, for example, in agriculture. K E Y W O R D S chitosan, citric acid, crosslinking, hydrogel, starch 1 | INTRODUCTION Hydrogels are extremely hydrophilic polymer networks, either synthetic (petrochemical based) or natural (biopolymers), which are usually stabilized through covalent bonds or noncovalent interactions among the macromolecule chains known as cross-linking. 1-4 Hydrogels will swell when placed in water and can retain an extensive fraction of water within their spatial structures without dissolving. 5 A gel structure forms within the polymer melt after cross-linking. Currently, a wide range of natural polymer hydrogels such as starch, chitosan, collagen, and cellulose have been described as suitable biomaterials for pharmaceutical and biomedical applications because of their biocompatibility, low-toxicity, and biodegradability. 6-10Starch and its derivatives have attracted many researchers for expanding biopolymer industries since they are cost-effective, renewable, abundant in nature, and biodegradable. 11-14 However, some limitations exist in the properties of starch including poor mechanical properties, high hydrophilicity, fragility, and poor dimensional stability. [15][16][17][18][19] To improve the quality and also broaden the application areas of starch, these drawbacks need to be reduced significantly.Chitosan, isolated from chitin, is another polysaccharide that is abundant in nature and available in large quantities. Chitosan is biocompatible, biodegradable, biofunctional, and antimicrobial. [20][21][22] Mo...

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Section: Introductionmentioning

confidence: 99%

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Peidayesh

Ahmadi

Khonakdar

et al. 2020

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…Biopolymers can be mixed with synthetic polymers to produce biodegradable materials at a cost similar to other non‐biodegradable polymers available on the market . Moreover, the demand for biodegradable materials has been gradually increasing due to the environmental impacts of oil refining, the accumulation of plastics in the environment, global petroleum scarcity, and the rising price of non‐biodegradable polymers .…”

Section: Introductionmentioning

confidence: 99%

Mixture design applied to evaluating the effects of polyvinyl alcohol (PVOH) and alginate on the properties of starch‐based films

et al. 2014

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Mixtures of starch and other polymers have been used to produce biodegradable materials with low‐cost and enhanced properties. In this study, films containing starch mixed with alginate (ALG) and/or polyvinyl alcohol (PVOH) were characterized. Films produced using binary starch–alginate mixtures (F3, F5, and F9) had the highest tensile strength (19–28 MPa) and elongation capacity (22–17%). However, films produced using ternary starch–alginate–PVOH mixtures (F8 and F9) exhibited the best water‐barrier efficacy, with lower water‐vapor permeability (WVP) values (5 × 10 and 5.56 × 10−13 g/s/Pa/m1, respectively) than that of the starch films (23.60 × 10−13 g/s/Pa) and diffusion coefficient (Dw) values approximately seven times lower than that of films produced solely with starch. The results of the infrared analyses showed a decrease in the band representing OH stretching in films created using ternary starch–alginate–PVOH mixtures, suggesting interaction between the polymers. The films containing starch mixed with ALG and PVOH showed low monolayer. The results indicated that ternary blends created better physical barriers to the passage of water vapor and diminished the availability of active sites for water binding. The optimal proportions were found to be 80% starch, 11.4% ALG and 8.6% PVOH.

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“…Water absorption has great influence on the application of materials. The absorbed moisture affects the mechanical properties as well as the dimensional stability . Starch is sensitive to water absorption because it has numerous hydroxyl groups .…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, bio‐based materials from renewable resources have attracted an increasing attention . Starch is one of the best alternatives to petroleum‐based plastics stemming from its abundant resource, low cost, renewability, and biodegradability . However, natural starch is limited because of its strong hydrophilicity and poor mechanical properties .…”

Section: Introductionmentioning

confidence: 99%

Polyurethane Prepolymer Modified Cassava Starch Based Poly(butylene adipate‐co‐terephthalate) Composites with Excellent Compatibility and High Toughness

et al. 2019

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In this study, a high‐efficiency polyurethane prepolymer (PUP) compatibilizer is developed to improve the compatibility between cassava starch and poly(butylene adipate‐co‐terephthalate) with higher molecular weight (MPBAT). Preferentially, modified starch (MS) is prepared by reacting isocyanate groups of PUP with hydroxyl groups of starch in a high‐speed mixer, and then starch‐based MPBAT composites (MSPT) with PUP as a compatibilizer are continuously extruded using twin‐screw extruder. The mechanical properties, water absorption, and thermodynamic properties as well as morphology of MSPT are investigated with different PUP contents and at the same mass ratio of MPBAT to starch (1:1). Samples of MSPT‐2 provide satisfactory mechanical properties comparable to control samples. Addition of 13 wt.% PUP to MSPT, improves tensile strength from 3.8 to 11.9 MPa and increases elongation at break from 93.3 to 580.4% at room temperature compared with control without the PUP. The hydrophobicity and thermostability properties of MSPT‐2 composites are also enhanced. The results further prove that MSPT‐2 composites possess excellent compatibility, not only because of the urethane bonds of the PUP and starch, but also stemming from the physical crosslinking between soft segment of PUP and aliphatic segment of MPBAT. Starch‐based MPBAT composites with excellent compatibility and high toughness will help broaden the application field of biodegradable plastics.

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Preparation of native cassava starch and cross‐linked starch blended foams

Cited by 13 publications

References 21 publications

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Baked hydrogel from corn starch and chitosan blends cross‐linked by citric acid: Preparation and properties

Mixture design applied to evaluating the effects of polyvinyl alcohol (PVOH) and alginate on the properties of starch‐based films

Polyurethane Prepolymer Modified Cassava Starch Based Poly(butylene adipate‐co‐terephthalate) Composites with Excellent Compatibility and High Toughness

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