Retrogradation and Antiplasticization of Thermoplastic Starch

Zhang, Yachuan; Rempel, Curtis

doi:10.5772/35848

Cited by 37 publications

(35 citation statements)

References 50 publications

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“…The E value did not change when the films were stored at 33 and 70 % RH, and this value decreased at the highest RH tested (90 %). This reduction in the E value could be related to an antiplasticizing effect from the humidity of the environment, which produced a softer film matrix [28,32]. A similar pattern was found in the film composites with CN.…”

Section: Resultssupporting

confidence: 65%

“…A statistical analysis (a = 0.05) showed that the storage time (3 and 5 days) did not affect the mechanical properties of the films. The storage time was too short to produce changes in the arrangement of the polymers in the composite film, affecting the mechanical properties [28]. Composite films containing CN had higher elastic module (E), tensile strength (U U ) and elongation at break (%El) than films blended with C. Similar findings were reported by Bras et al [29], Chang et al [13], De Teixeira et al [30], and Siqueira et al [31], who mentioned that the change in mechanical properties was due to the superior reinforcing effect of the CN as a result of the increase in the contact area and hydrogen bonding between the surface of the CN and the starch matrix (amylose and amylopectin), which produce a continuous rigid network of cellulose nanofibers linked by hydrogen bridges, thus increasing the mechanical properties of the composite films.…”

Section: Resultsmentioning

confidence: 99%

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Properties of Cast Films Made of Chayote (Sechium edule Sw.) Tuber Starch Reinforced with Cellulose Nanocrystals

et al. 2014

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In this study, cellulose (C) and cellulose nanocrystals (CN) were blended with chayotextle starch to prepare films for the casting method. The films were stored at different temperatures and relative humidity (RH), and were analyzed by mechanical tests, X-ray diffraction, thermogravimetric analysis and biodegradation rate. The results of the mechanical characterization showed the highest values in the films with CN. In general, both type of films (with C and CN) presented an increase in the mechanical properties when the RH and temperature increased. The X-ray diffraction pattern of the films did not show any appreciable change from the effect of RH and temperature during storage. The thermogravimetric test showed that the RH and temperature of the storage did not affect the loss mass rate. The biodegradation of the films with C and CN was higher by temperature than RH, but at the longest storage times (up to 20 days) no change was observed by storage condition.

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Section: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Properties of Cast Films Made of Chayote (Sechium edule Sw.) Tuber Starch Reinforced with Cellulose Nanocrystals

et al. 2014

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“…This occurrence can be explained by the anti-plasticization behavior or phase separation of highly plasticized starch films. The anti-plasticization effect of plasticizers on starch based films depends on their concentration level [14,79,80]. The stress-strain curves in Figure 3 clearly shows the decrease of film tensile strength and increase of flexibility as plasticizer concentration increased.…”

Section: Elongation At Break Of Sps Plasticized Filmsmentioning

confidence: 99%

Effect of Plasticizer Type and Concentration on Tensile, Thermal and Barrier Properties of Biodegradable Films Based on Sugar Palm (Arenga pinnata) Starch

et al. 2015

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The use of starch based films as a potential alternative choice to petroleum derived plastics is imperative for environmental waste management. This study presents a new biopolymer (sugar palm starch) for the preparation of biodegradable packaging films using a solution casting technique. The effect of different plasticizer types (glycerol (G), sorbitol (S) and glycerol-sorbitol (GS) combination) with varying concentrations (0, 15, 30 and 45, w/w%) on the tensile, thermal and barrier properties of sugar palm starch (SPS) films was evaluated. Regardless of plasticizer types, the tensile strength of plasticized SPS films decreased, whereas their elongation at break (E%) increased as the plasticizer concentrations were raised. However, the E% for G and GS-plasticized films significantly decreased at a higher plasticizer concentration (45% w/w) due to the anti-plasticization effect , irrespective of plasticizer types. Overall, the current study manifested that plasticized sugar palm starch can be regarded as a promising biopolymer for biodegradable films.

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“…Hence, products made from native starches easily crumble into bits when dried in ambient conditions. Strong intermolecular hydrogen bonding between the amylose and amylopectin macromolecular network chains (Ma and Yu 2004;Zhang and Rempel 2012) are responsible for the brittle nature of starches. The introduction of plasticizers together with elevated temperatures and shear, increases the flexibility of native starches similar to conventional thermoplastic polymers.…”

Section: Introductionmentioning

confidence: 99%

Effect of plasticizer type and concentration on physical properties of biodegradable films based on sugar palm (arenga pinnata) starch for food packaging

et al. 2015

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In this study, sugar palm starch (SPS) films were developed using glycerol (G), sorbitol (S) or their combination (GS) as plasticizers at the ratio of 15, 30 and 45 (wt)% using casting technique. The addition of plasticizers to SPS film-forming solutions helped to overcome the brittle and fragile nature of unplasticized SPS films. Increased plasticizer concentration resulted to an increase in film thickness, moisture content and solubility. On the contrary, density and water absorption of plasticized films decreased with increasing plasticizer concentration. Raising the plasticizer content from 15 to 45 % showed less effect on the moisture content and water absorption of S-plasticized films. Films containing glycerol and glycerol-sorbitol plasticizer (G, and GS) demonstrated higher moisture content, solubility and water absorption capacity compared to S-plasticized films. The results obtained in this study showed that plasticizer type and concentration significantly improves film properties and enhances their suitability for food packaging applications.

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Retrogradation and Antiplasticization of Thermoplastic Starch

Cited by 37 publications

References 50 publications

Properties of Cast Films Made of Chayote (Sechium edule Sw.) Tuber Starch Reinforced with Cellulose Nanocrystals

Properties of Cast Films Made of Chayote (Sechium edule Sw.) Tuber Starch Reinforced with Cellulose Nanocrystals

Effect of Plasticizer Type and Concentration on Tensile, Thermal and Barrier Properties of Biodegradable Films Based on Sugar Palm (Arenga pinnata) Starch

Effect of plasticizer type and concentration on physical properties of biodegradable films based on sugar palm (arenga pinnata) starch for food packaging

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