Influence of Plasticizers in Enzymatic Degradation and Water Resistance of Starch Foam Trays Obtained by Thermal Expansion

Stoffel, Fernanda; Weschenfelder, Eduarda Francine; Camassola, Marli; Piemolini-Barreto, Luciani Tatsch; Zeni, Mára

doi:10.1007/s10924-019-01387-1

Cited by 9 publications

(7 citation statements)

References 30 publications

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“…In general, all the weight of the sample films reduced steadily by ~24% to 26% in the first 7 days. The decrease in weight of the samples for the first 7 days was due to the hydrolytic degradation of the glycerol plasticizer [ 30 ], which is attributed to the fact that glycerol played the plasticizer role in upsetting and restructuring the intermolecular polymer chain of PLA and PAni by hydrogen bonding [ 31 ]. Hydrolysis degradation of glycerol prior to happening during the degradation test as glycerol consists of hydrogen groups.…”

Section: Resultsmentioning

confidence: 99%

Crazing Effect on the Bio-Based Conducting Polymer Film

et al. 2021

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The biodegradability problem of polymer waste is one of the fatal pollutFions to the environment. Enzymes play an essential role in increasing the biodegradability of polymers. In a previous study, antistatic polymer film based on poly(lactic acid) (PLA) as a matrix and polyaniline (PAni) as a conductive filler, was prepared. To solve the problem of polymer wastes pollution, a crazing technique was applied to the prepared polymer film (PLA/PAni) to enhance the action of enzymes in the biodegradation of polymer. This research studied the biodegradation test based on crazed and non-crazed PLA/PAni films by enzymes. The presence of crazes in PLA/PAni film was evaluated using an optical microscope and scanning electron microscopy (SEM). The optical microscope displayed the crazed in the lamellae form, while the SEM image revealed microcracks in the fibrils form. Meanwhile, the tensile strength of the crazed PLA/PAni film was recorded as 19.25 MPa, which is almost comparable to the original PLA/PAni film with a tensile strength of 20.02 MPa. However, the Young modulus decreased progressively from 1113 MPa for PLA/PAni to 651 MPa for crazed PLA/PAni film, while the tensile strain increased 150% after crazing. The significant decrement in the Young modulus and increment in the tensile strain was due to the craze propagation. The entanglement was reduced and the chain mobility along the polymer chain increased, thus leading to lower resistance to deformation of the polymer chain and becoming more flexible. The presence of crazes in PLA/PAni film showed a substantial change in weight loss with increasing the time of degradation. The weight loss of crazed PLA/PAni film increased to 42%, higher than that of non-crazed PLA/PAni film with only 31%. The nucleation of crazes increases the fragmentation and depolymerization of PLA/PAni film that induced microbial attack and led to higher weight loss. In conclusion, the presence of crazes in PLA/PAni film significantly improved enzymes’ action, speeding up the polymer film’s biodegradability.

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Section: Resultsmentioning

confidence: 99%

Crazing Effect on the Bio-Based Conducting Polymer Film

et al. 2021

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“…One of these alternatives is the application of starch as a polymer in the production of films and foams. [1,9,41,42]…”

Section: Foam Production Processesmentioning

confidence: 99%

“…As with other characteristics of starch, the influence of the plasticizing agent varies according to the source of origin of the starch. [27,42,50,96] The foams can use only water, as a plasticizing agent, in their composition, and the content and temperature of the water can influence the characteristics and properties of the foams. The study by Meng et al evaluated the influence of different water contents on the melting temperature, cell structure, and mechanical properties of corn starch-based foams.…”

Section: Starch Plasticizersmentioning

confidence: 99%

Starch Foams and Their Additives: A Brief Review

Figueiró,

Calcagno,

Santana

2023

Starch Stärke

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Short‐life packaging has been contributing to the increased consumption of polymers. Expanded polystyrene (EPS) is a material that is widely used in disposable packaging, however, its residue occupies a large volume, is difficult to degrade, and its recycling is expensive. That's why the interest in looking for a material of natural and biodegradable origin that can be an alternative to petrochemical‐based polymers. One possibility would be starch, which is a natural and biodegradable polysaccharide and can be extracted from different sources. However, natural starch does not have good properties for commercial application, requiring chemical modifications and/or the incorporation of additives. This article carried out a compilation of current studies that work on the development of packaging, whether film or foams, based on plasticized starch (TPS), and analyzes the influence of the incorporation of additives or treatments carried out in the starch. The blowing agent decreases foam density, cell size, and increases cell density. Incorporation of glycerol in starch foams increases the gelatinization temperature, decreases viscosity and resistance to expansion. The surfactant decreases the density and moisture absorption of the foam, the nucleating agent acted by increasing the mechanical strength and density of the foam, and decreases the absorption of water.

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“…Studies indicate the feasibility of applying starch for the production of packaging and packaging materials such as the production of expanded films and foams from starch. [ 8–14 ]…”

Section: Introductionmentioning

confidence: 99%

“…Studies indicate the feasibility of applying starch for DOI: 10.1002/star.202300011 the production of packaging and packaging materials such as the production of expanded films and foams from starch. [8][9][10][11][12][13][14] Starch is a polysaccharide found in different botanical sources. The main sources of starch are rice (70% starch), corn (60% starch), wheat (52% starch), cassava (22% starch), and potato (20% starch).…”

Section: Introductionmentioning

confidence: 99%

Effect of Silica Content on Cellular Structural and Hygroscopicity of Modified Cassava Starch Foam

et al. 2023

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The grow in polymer production is influenced by the high demand from the packaging sector. Expanded polystyrene (EPS) is one of these materials that is widely used in disposable packaging, however, generating waste that occupies a large volume, besides being of difficult degradation. Starch, a naturally occurring and biodegradable polysaccharide, would be an alternative in the search for a renewable source material. However, starch foams have some limitations related to their hygroscopicity. The objective of this study wasto analyze the influence of silica content (1, 2 and 3%) on the cell structure and surface hygroscopicity of cassava starch foams. The foams containing starch, glycerol and water wereproduced by thermo‐compression molding. Results showed that, at lower contents, silica acted predominantly as a nucleating agent, generating smaller cells in the foam. At the higher silica content, it played a more efficient role in reducing the affinity of the starch for water. The formulation with 2% silica showed the highest density (0.232 g/cm3), impact strength (2067 J/m2) and contact angle (84.8°).This article is protected by copyright. All rights reserved

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Influence of Plasticizers in Enzymatic Degradation and Water Resistance of Starch Foam Trays Obtained by Thermal Expansion

Cited by 9 publications

References 30 publications

Crazing Effect on the Bio-Based Conducting Polymer Film

Crazing Effect on the Bio-Based Conducting Polymer Film

Starch Foams and Their Additives: A Brief Review

Effect of Silica Content on Cellular Structural and Hygroscopicity of Modified Cassava Starch Foam

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