Effect of aging on the microstructure of plasticized cornstarch films

Thiré, Rossana Mara da Silva Moreira; Andrade, Cristina T.; Simão, Renata Antoun

doi:10.1590/s0104-14282005000200013

Cited by 9 publications

(4 citation statements)

References 12 publications

(9 reference statements)

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“…3 and 4 show that the films presented a semi-crystalline structure with a difractogram of four peaks close to 9.87, 17.27, 19.97 and 21.67, which are typical of the Vhtype crystallinity. This type of crystallinity is attributed to the formation of an amylose-lipid complex after the starch has been gelatinized [38]. The transformation of the crystallinity pattern from A-to Vh-type has been observed previously in the films of starch from wheat and maize [25,38,39].…”

Section: X-ray Diffractionsupporting

confidence: 62%

Physical and Mechanical Properties of Durum Wheat (Triticum durum) Starch Films Prepared with A‐ and B‐type Granules

Montaño-Leyva¹,

Torres-Chávez²,

Ramírez‐Wong³

et al. 2008

Starch Stärke

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The use of starch for the production of biodegradable materials has been increasing. Wheat is an important source, however, durum wheat starch and its separated granular components had not been evaluated for this purpose. The aim of this study was to evaluate the physical and mechanical properties of durum wheat starch films when prepared with a distribution of different granular-sized starches (A-and B-type). Starch was isolated, and the A and B populations of granules were separated. Films were prepared by casting. Glycerol (G) was used as a plasticizer in concentrations of 25% and 40%, respectively. Starch films were evaluated using scanning electron microscopy (SEM), mechanical properties (tensile strength, TS, elongation at break, E, elastic modulus, EM), solubility, and X-ray diffraction (XRD). Durum wheat starch films were transparent, flexible, and, according to SEM, highly homogeneous. Films prepared with 25% G showed brittle material behavior (TS = 42-50 MPa, E = 1.4-2.7%, and EM = 31-34 MPa), whereas those prepared with 40% G had ductile material characteristics (TS = 11-17 MPa, E = 4-41%, and EM = 4-11.3 MPa). These mechanical properties of the films were significantly affected by the glycerol concentration and the starch granule type used. The film solubility was low when compared to those reported in other studies. It increased with increasing plasticizer concentration. According to the XRD, the films showed a semi-crystalline structure.

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Section: X-ray Diffractionsupporting

confidence: 62%

Physical and Mechanical Properties of Durum Wheat (Triticum durum) Starch Films Prepared with A‐ and B‐type Granules

Montaño-Leyva¹,

Torres-Chávez²,

Ramírez‐Wong³

et al. 2008

Starch Stärke

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“…In a previous study, biodegradable films were developed using starches from different plant sources as the base raw materials such as sweet potato [2], yam [3][4][5], corn [6], potato [7], cassava [8][9][10], rice [11], and sago [12,13]. Moreover, sugar palm starch is also a potential biopolymer material for making biodegradable films [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…In the absence of additives, films made from starch or amylose are brittle [6]. The addition of plasticizers overcomes starch film brittleness and improves flexibility and extensibility.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and microstructural properties of sugar palm (Arenga pinnata Merr.) starch film: Effect of aging

Apriyana¹,

Poeloengasih²,

Hernawan³

et al. 2016

AIP Conference Proceedings

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A physicochemical study of sugar palm (Arenga Pinnata) starch films plasticized by glycerol and sorbitol AIP Conference Proceedings 1711, 080003 (2016) (20, 30, 40 and 50% w/w starch). The film samples were stored for 1, 4 and 8 week at 25 o C under 52%RH. The results showed that there is an increasing tendency of thickness, moisture content, solubility, and elongation at break as glycerol concentration increased, whereas tensile strength decreased as glycerol concentration were raised. The moisture content and solubility of plasticized film initially increased after 1 week but decreased after 4 weeks of storage. Aging films affected to mechanical properties, increasing resistance but reducing their stretchability. The XRD results showed that the crystallinity of sample with various glycerol concentration tends to decrease after 8 weeks storage.

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“…When the TPS films are aged in presence of moisture, the disaggregated starch chains retrograde slowly into a partially ordered structures which is different from those in native starch granules thus again showing a crystalline pattern. All the films show a definite peak at 19° attributed to B type crystallinity, which is due to recrystallization of short outer chains of amylopectin . One more type of crystal structure can also be identified for amylose‐containing starches, i.e., the V‐type, formed by the crystallization of amylose in single helices involving glycerol or lipids, which occurs during processing.…”

Section: Resultsmentioning

confidence: 98%

Bionanocomposites reinforced with cellulose nanofibers derived from sugarcane bagasse

et al. 2016

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Thermoplastic starch (TPS)/cellulose nanofiber (CNF) based nanocomposites were prepared by thermally plasticizing regular cornstarch by sorbitol and reinforcing it with cellulose nanofibers extracted from sugarcane bagasse using alkali steam explosion coupled with high shear homogenization. High shear results in shearing of the fiber agglomerates resulting in uniformly dispersed nanofibers. Final nanofibers size was found in the range of 30–40 nm. Various analytical techniques were used to characterize cellulose nanofibrils and thermoplastic starch/cellulose nanofiber based nanocomposites like scanning electron microscopy (SEM), X‐ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy. Tensile and barrier properties of prepared nanocomposites were also examined. Nano‐reinforcement resulted in substantial improvement of mechanical and barrier properties of the composites as compared to the neat polymer. POLYM. COMPOS., 39:E55–E64, 2018. © 2016 Society of Plastics Engineers

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Effect of aging on the microstructure of plasticized cornstarch films

Cited by 9 publications

References 12 publications

Physical and Mechanical Properties of Durum Wheat (Triticum durum) Starch Films Prepared with A‐ and B‐type Granules

Physical and Mechanical Properties of Durum Wheat (Triticum durum) Starch Films Prepared with A‐ and B‐type Granules

Mechanical and microstructural properties of sugar palm (Arenga pinnata Merr.) starch film: Effect of aging

Bionanocomposites reinforced with cellulose nanofibers derived from sugarcane bagasse

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