Properties of Starch/PVA Blend Films Containing Citric Acid as Additive

Park, Hye-Ryoung; Chough, Sung-Hyo; Yun, Yeon-Hum; Yoon, Soon-Do

doi:10.1007/s10924-005-5532-1

Cited by 122 publications

(65 citation statements)

References 24 publications

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“…Citric acid has also been used as an additive to starch-PVA (poly(vinyl alcohol)) films (Park et al, 2005). It was reported that adding citric acid decreased the strength of the films but provided better strength than glycerol-added films.…”

Section: Thermoplastic Starch (Tps) Is Indeed a Very Interesting Prodmentioning

confidence: 99%

Influence of citric acid and water on thermoplastic wheat flour/poly(lactic acid) blends. I: Thermal, mechanical and morphological properties

Chabrat

Abdillahi

Rouilly

et al. 2012

Industrial Crops and Products

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. Influence of citric acid and water on thermoplastic wheat flour/poly(lactic acid) blends. I: Thermal, mechanical and morphological properties. Industrial Crops and Products, Elsevier, 2012, vol. 37, pp. 238-246 Wheat flour was plasticized with glycerol and compounded with poly(lactic acid) in a one-step twinscrew extrusion process in the presence of citric acid with or without extra water. The influence of these additives on process parameters and thermal, mechanical and morphological properties of injected samples from the prepared blends, was then studied. Citric acid acted as a compatibilizer by promoting depolymerization of both starch and PLA. For an extrusion without extra water, the amount of citric acid (2 parts for 75 parts of flour, 25 parts of PLA and 15 parts of glycerol) has to be limited to avoid mechanical properties degradation. Water, added during the extrusion, improved the whole process, minimizing PLA depolymerization, favoring starch plasticization by citric acid and thus improving phases repartition.

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Section: Thermoplastic Starch (Tps) Is Indeed a Very Interesting Prodmentioning

confidence: 99%

Influence of citric acid and water on thermoplastic wheat flour/poly(lactic acid) blends. I: Thermal, mechanical and morphological properties

Chabrat

Abdillahi

Rouilly

et al. 2012

Industrial Crops and Products

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“…16 Studies on the modification of the starch/PVA blend using glycerol, citric acid, UV radiation, and plasma treatments have been reported. [17][18][19][20] The present article reports the results of studies on the effect of varying amounts of glycerol on the mechanical, viscoelastic, thermal, and crystallization behavior of the starch/PVA blend at a constant blend ratio.…”

Section: Introductionmentioning

confidence: 99%

Effect of glycerol on thermal and mechanical properties of polyvinyl alcohol/starch blends

Sreekumar

Al‐Harthi

2011

J of Applied Polymer Sci

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The paper reports the results of studies on the effect of glycerol content on thermal, mechanical, and dynamic mechanical properties of blends of starch and polyvinyl alcohol (PVA). Degree of crystallinity of the starch/ PVA blends (4 g/4 g ratio) remains almost constant up to 3.78 g of glycerol as determined by differential scanning calorimetry (DSC) and x-ray diffraction studies. At higher loading of glycerol the crystallinity decreases. DTG thermograms revealed occurring of one maximum degradation temperature closer to that of starch in blends containing up to 3.78 g of glycerol. At higher glycerol content there gradually occur two distinct peaks of maximum degradation temperature, one occurring close to that of starch and other occurring close to the PVA peak, indicating phase separation of the blend components. Results of stress-strain studies indicate lowering of tensile properties and energy at break particularly at higher glycerol content (beyond 3.78 g). Dynamic mechanical studies reveal a sharp drop in dynamic modulus at higher glycerol content at all temperatures. The blend with low glycerol content shows transitions of starch, while the blend containing high glycerol content beyond 3.78 g display the transitions due to both starch and PVA.

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“…In the last years, several researchers have studied new eco-friendly materials preferentially from renewable resources to replace conventional petrochemical polymers [1,2] . Starch is one of most studied biopolymer for biodegradable materials production, due to its low cost, biodegradability, and from renewable sources [3] , but pure starch presents some drawbacks to replace conventional polymers due to its inherent brittleness, poor mechanical properties, and the hydrophilic character.…”

Section: Introductionmentioning

confidence: 99%

Polyvinyl alcohol (PVA) molecular weight and extrusion temperature in starch/PVA biodegradable sheets

et al. 2018

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ObstractThe aim of this work was to study the relationship of chain size of partially hydrolyzed PVA blended with starch in properties of biodegradable sheets produced by thermoplastic extrusion. It was also studied the effect of extrusion temperature profile to determine the better PVA chain size and temperature profile to produce biodegradable sheets through a factorial design. The processability and the mechanical, thermal, optical, and microstructural properties of the biodegradable sheets were adequate, indicating that PVA/cassava starch blends have potential to replace conventional non-biodegradable polymers. Tensile strength and Young's modulus ranges from 1.0 to 2.6 and 3.0 to 6.9 MPa respectively, the elongation at break ranges from 42 to 421%. It was not possible to state a conclusive relationship between PVA molecular weight and the materials properties, but in general, PVA with medium molecular weight and high extrusion temperature profile promote an increase of mechanical properties of the sheets.

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Properties of Starch/PVA Blend Films Containing Citric Acid as Additive

Cited by 122 publications

References 24 publications

Influence of citric acid and water on thermoplastic wheat flour/poly(lactic acid) blends. I: Thermal, mechanical and morphological properties

Influence of citric acid and water on thermoplastic wheat flour/poly(lactic acid) blends. I: Thermal, mechanical and morphological properties

Effect of glycerol on thermal and mechanical properties of polyvinyl alcohol/starch blends

Polyvinyl alcohol (PVA) molecular weight and extrusion temperature in starch/PVA biodegradable sheets

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