Phase state of starch gels at different water contents

Yuryev, Vladimir P.; Nemirovskaya, I. E.; Maslova, T.D.

doi:10.1016/0144-8617(95)98833-3

Cited by 29 publications

(24 citation statements)

References 4 publications

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“…Particularly, these chains could be arranged both in an amorphous background and in amorphous lamellae [55]. It was shown that glass transition temperature (T g ) for polysaccharide chains in disordered conformation at excess water is in the range from −45 to −20 • C [56], i.e. chains in amorphous background did not participate in the glass transition in observed temperature range.…”

Section: Resultsmentioning

confidence: 95%

“…On the other hand, the glass transition process of disordered polysaccharide chains arranged within amorphous lamellae takes place in the same temperature interval as for the melting of the crystalline lamellae [54,57]. Generally, for starches the ratio of glass transition temperature (T g ) to melting temperature (T m ) spans from 0.5 to 1 [41,[56][57][58]. When T g /T m ∼1, i.e.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Structural and thermodynamic properties of starches extracted from GBSS and GWD suppressed potato lines

Козлов

Blennow

Кривандин

et al. 2007

International Journal of Biological Macromolecules

112

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Structural and thermodynamic properties of starches extracted from GBSS and GWD suppressed potato lines

Козлов

Blennow

Кривандин

et al. 2007

International Journal of Biological Macromolecules

112

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“…This was ascribed to an antiplasticization effect [16] occurring upon addition of small amounts of plasticizer due to the disappearance of local molecular mobility of starch (brelaxation). The behavior was mainly attributed to intermolecular interactions [17]. Above the saturation point of glycerol content, both tensile strength and Young's modulus decreased considerably along with increasing glycerol content up to 30%, and then leveled off somewhat.…”

Section: Mechanical Propertiesmentioning

confidence: 94%

Effect of Glycerol on Water Vapor Sorption and Mechanical Properties of Starch/Clay Composite Films

Wang

Xiao

et al. 2008

Starch Stärke

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Plasticized starch/clay composite films were prepared by casting aqueous solutions containing oxidized corn starch, different concentrations of glycerol as a plasticizer and 5% clay (sodium montmorillonite, Na 1 -MMT) on the basis of dry starch. The waterbinding properties of the composite films were evaluated by water vapor sorption isotherms at room temperature and various relative humidities (RHs). Mechanical properties and abrasion resistance were also analyzed for the films with varying glycerol contents at 68% RH and room temperature. Changes in water sorption isotherms suggested that glycerol interacted with both water and starch in a complicated way. A saturation phenomenon of glycerol, depending on RH, was observed based on the isotherms. Above this saturation content, phase separation of the system occurred with the appearance of free glycerol. According to mechanical performance and abrasion resistance, as well as water vapor sorption of the starch blend films, the threestage transition was presented to be related to the state of glycerol in the blend system, i.e. adsorption of glycerol onto H-bonding sites of starch, supersaturation of glycerol as plasticizer and further supersaturation of glycerol. Only above the supersaturation content can glycerol play a plasticizer role in starch-based composites.

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“…During storage, aging was evident in different recrystallization processes of polymer chains and diffusion of plasticizers into the external TPS. This recrystallization (retrogradation) phenomenon depends on environmental conditions that affect the phase separation between the plasticizer and starch 113, 114. Glycerol‐containing starch plastics have been shown to recrystallize into various crystalline structures during storage, which results in mechanical property changes.…”

Section: Plastification and Plasticizersmentioning

confidence: 99%

Thermoplastic starches: Properties, challenges, and prospects

et al. 2013

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Thermoplastic starch (TPS) polymers were reviewed in this article. This review was categorized into the following studies: the role of starch as a thermoplastic polymer, transformation and melting mechanisms, plasticization and plasticizers, reactive extrusion (REX) and modifications, retrogradation, biodegradability, filler and blenders, and nano‐particle incorporation in thermoplastic starch. This categorization allows us to understand the developments in this field in recent years and shows that the major challenges in the future are reducing sensitivity to moisture and retarding retrogradation of the thermoplastic matrix. Moreover, nano‐particles such as clay can be used in TPS matrices to overcome these disadvantages.

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Phase state of starch gels at different water contents

Cited by 29 publications

References 4 publications

Structural and thermodynamic properties of starches extracted from GBSS and GWD suppressed potato lines

Structural and thermodynamic properties of starches extracted from GBSS and GWD suppressed potato lines

Effect of Glycerol on Water Vapor Sorption and Mechanical Properties of Starch/Clay Composite Films

Thermoplastic starches: Properties, challenges, and prospects

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