Aging‐induced structural relaxation in cornstarch plasticized with urea and glycerol

Smidova, Natalia M.; Šoltýs, Alojz; Hronský, Viktor; Olčák, Dušan; Popovič, Ľuboš; Chodák, Ivan

doi:10.1002/app.50218

Cited by 17 publications

(18 citation statements)

References 40 publications

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“…Research indicates that urea can form stronger bonds with starch chains than glycerol, allowing better material plasticization. The same researchers [20] confirmed the obtained results in another publication, additionally using the WAXS method to evaluate the structure of the obtained TPS.…”

Section: Introductionsupporting

confidence: 75%

Structural and Thermal Properties of Starch Plasticized with Glycerol/Urea Mixture

et al. 2021

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The paper presents the results of research on the influence of used plasticizing system on the structural and thermal properties of thermoplastic starch (TPS). The thermoplastic starch granulate was obtained by extrusion of native starch in the presence of a plasticizing system using a twin-screw extruder. Glycerol and urea were used as plasticizers in various proportions. In order to evaluate the effectiveness of the starch plasticization process, changes in its chemical structure were analyzed by infrared spectroscopy (FTIR), gel permeation chromatography (GPC) and X-ray diffraction (XRD). TPS thermal stability was determined by thermogravimetric analysis (TGA). An improvement in the efficiency of the plasticization process has been found for a urea-containing plasticizing system compared to the composition of starch plasticized only with glycerol. In addition, the XRD analysis confirms the beneficial effect of urea on the inhibition of starch retrogradation process.

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Section: Introductionsupporting

confidence: 75%

Structural and Thermal Properties of Starch Plasticized with Glycerol/Urea Mixture

et al. 2021

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“…They showed that the boric acid can provide a better anti-retrogradation effect compared to the glycerol, whereas the TPS films that contain co-plasticizers have higher moisture sensitivity compared to glycerol/TPS films [12]. Glycerol was also proposed to be a co-plasticizer with other components containing amide groups such as urea, formaldehyde, and formamide in order to reduce the retrogradation in the TPS by forming a stronger hydrogen bonding [13][14][15]. Nonetheless, this kind of plasticizer is rather toxic to human health; therefore it is not suitable to be applied in food packaging material.…”

Section: Introductionmentioning

confidence: 99%

“…DSC, XRD, and FTIR analyses were employed to study the crystalline structural change, enthalpy crystalline melting, and crystalline melting temperature of the TPS films. These three tests are highly sensitive and have been proven in many studies as valuable and reliable tools to quantify the retrogradation that happens in TPS films [15,16]. All the data were compiled, analyzed, and correlated with the retrogradation process of the starch chains, to investigate the effectiveness of the hybrid filler in inhibiting the aging of the TPCS matrix.…”

Section: Introductionmentioning

confidence: 99%

Effective Aging Inhibition of the Thermoplastic Corn Starch Films through the Use of Green Hybrid Filler

et al. 2022

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Recently, hybrid fillers have been widely used to improve the properties of biopolymers. The synergistic effects of the hybrid fillers can have a positive impact on biopolymers, including thermoplastic corn starch film (TPCS). In this communication, we highlight the effectiveness of hybrid fillers in inhibiting the aging process of TPCS. The TPCS, thermoplastic corn starch composite films (TPCS-C), and hybrid thermoplastic corn starch composite film (TPCS-HC) were stored for 3 months to study the effect of hybrid filler on the starch retrogradation. TPCS-C and TPCS-HC were prepared by casting method with 5 wt% of fillers: nanocellulose (NC) and bentonite (BT). The alteration of the mechanical properties, aging behavior, and crystalline structure of the films were analyzed through the tensile test, Fourier transform infrared (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and water absorption analysis. The obtained data were correlated to each other to analyze the retrogradation of the TPCS, which is the main factor that contributes to the aging process of the biopolymer. Results signify that incorporating the hybrid filler (NC + BT) in the TPCS/4BT1NC films has effectively prevented retrogradation of the starch molecules after being stored for 3 months. On the contrary, the virgin TPCS film showed the highest degree of retrogradation resulting in a significant decrement in the film’s flexibility. These findings proved the capability of the green hybrid filler in inhibiting the aging of the TPCS.

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“…However, the poor processability, weak mechanical properties, and severe hydrophilicity limit the wide application of starch. Therefore, the plasticization of starch is crucial in order to present melting behavior by adding common plasticizer molecules such as glycerol, [2][3][4][5][6] water, 7,8 urea, [9][10][11] citric acid, [12][13][14] formamide, [15][16][17] , etc.…”

Section: Introductionmentioning

confidence: 99%

Synergistic toughening of polypropylene by thermoplastic starch acetate andSEBS‐MAH

Chen

Han

et al. 2022

J of Applied Polymer Sci

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The plasticized starch exhibits flexible properties, similar to that of elastomer. In this paper, thermoplastic starch acetate (TPAS) and maleic anhydride grafted poly[styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS-MAH) were used to toughen polypropylene (PP) through melt blending. It is found TPAS and SEBS-MAH have a synergistic toughening effect on PP, especially the notched impact strength of PP/TPAS/SEBS-MAH (70/15/15) blend is as high as 83.4 kJ/m 2 , but only 7.2 kJ/m 2 of that for PP/TPAS/SEBS (70/15/15) blend. The structure-property relationship of the PP/TPAS/SEBS-MAH blends was investigated. Compared with PP/TPAS/SEBS (70/15/15) blend, the TPAS domains are dispersed homogeneously in the PP/TPAS/SEBS-MAH (70/15/15)blend with the domain size of TPAS less than 0.2 μm. The incorporation of SEBS-MAH not only improves the compatibility between PP and TPAS but also facilitates the formation of a core-shell structure with TPAS as the core and SEBS-MAH as the shell. Thus formed core-shell particles play an important role in toughening PP. The spreading coefficient of the multiphase blend reveals that only when the SEBS-MAH content is higher than TPAS, the coreshell structure can be formed. Otherwise, TPAS and SEBS-MAH will disperse separately and the toughness will not be improved. This work provides a new insight into polymer toughening with TPAS.

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Aging‐induced structural relaxation in cornstarch plasticized with urea and glycerol

Cited by 17 publications

References 40 publications

Structural and Thermal Properties of Starch Plasticized with Glycerol/Urea Mixture

Structural and Thermal Properties of Starch Plasticized with Glycerol/Urea Mixture

Effective Aging Inhibition of the Thermoplastic Corn Starch Films through the Use of Green Hybrid Filler

Synergistic toughening of polypropylene by thermoplastic starch acetate andSEBS‐MAH

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