Chemical, physical, and mechanical properties evolution in electron beam irradiated isotactic polypropylene

Maeda, Eduardo A; Santos, Aritânia Sousa; Silva, Leonardo Gondim de Andrade e; Schön, Cláudio Geraldo

doi:10.1016/j.matchemphys.2015.11.027

Cited by 11 publications

(3 citation statements)

References 28 publications

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“…Percent elongation at break was expressed as the percentage of change of the original length of a specimen between grips at the break. 34,35 2.5. Transparency and Opacity.…”

Section: Methodsmentioning

confidence: 99%

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Biodegradable Films Derived from Corn and Potato Starch and Study of the Effect of Silicate Extracted from Sugarcane Waste Ash

Azevedo

Rovani

Santos

et al. 2020

ACS Appl. Polym. Mater.

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The growing concern with the amount of plastic materials found in the oceans makes it necessary to develop biodegradable materials that have low toxicity to marine animals and humans, but at the same time are resistant to the actions of microorganisms such as fungi or bacteria. On the other hand, agricultural waste rich in inorganic materials (such as silica) is often discarded, while it could be reused as a source of raw material. Considering these points, sodium silicate solution extracted from sugarcane waste ash was utilized to prepare biodegradable bioplastics based on corn starch and potato starch. The starch-based bioplastics were produced by casting and characterized by several physical-chemical techniques evaluating tensile strength, elongation at break, color analyses, transparency, opacity, moisture, and biodegradation assay. Bioplastics prepared with corn starch presented better physical, mechanical, and thermal properties and optical quality than bioplastics based on potato starch. The samples called CS3 and PS3, with 5.0% glycerol, were the most resistant to tensile strengths of 0.73 and 0.36 MPa, respectively. On the other hand, the highest elongation at break values were found for the samples with 7.5% glycerol (CS9, 52.90% and PS9, 49.33%). Corn starch-based bioplastics were more thermally resistant (CS3, 152.86 °C and CS9, 135.20 °C) when compared to potato starch-based bioplastics (PS3, 140.39 °C and PS9, 127.57 °C). In general, the addition of sodium silicate solution improved the mechanical and thermal properties of both types of bioplastics. The potato starch-based bioplastics were biodegraded in 5 days, while those made from corn starch took almost 40 days. The inclusion of sodium silicate inhibited fungal growth for both corn starch and potato starch bioplastics. The results suggest that sodium silicate solution obtained from renewable sources can be incorporated into starch-based bioplastics for production of biodegradable packaging with antifungal activity.

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“…Percent elongation at break was expressed as the percentage of change of the original length of a specimen between grips at the break. 34,35 2.5. Transparency and Opacity.…”

Section: Methodsmentioning

confidence: 99%

“…The tensile strength was calculated by dividing the maximum force exerted on the bioplastic during fracture by the cross-sectional areas. Percent elongation at break was expressed as the percentage of change of the original length of a specimen between grips at the break. , …”

Section: Experimental Sectionmentioning

confidence: 99%

Biodegradable Films Derived from Corn and Potato Starch and Study of the Effect of Silicate Extracted from Sugarcane Waste Ash

Azevedo

Rovani

Santos

et al. 2020

ACS Appl. Polym. Mater.

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show abstract

“…al., , 2015Satti et. al., , 2016Vallés et.al., 1990;Maeda et al, 2016). As a result, polymers are generally classified into those that predominantly lead to formation of crosslinking between their chains and those that primarily degrade under the effect of radiation.…”

Section: Introductionmentioning

confidence: 99%

Rheological analysis of irradiated crosslinkable and scissionable polymers used for medical devices under different radiation conditions

Satti

Ressia

Cerrada

et al. 2018

Radiation Physics and Chemistry

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The effects on different synthetic polymers of distinct types of radiation, gamma rays and electron beam, under different atmospheres are followed by changes in their viscoelastic behavior. Taking into account the two main radioinduced reactions, crosslinking and scissioning of polymeric chains, liquid polydimethylsiloxane has been used as example of crosslinkable polymer and semi crystalline polypropylene as example of scissionable polymer. Propylene-1-hexene copolymers have been also evaluated, and the effects of both reactions were clearly noticed. Accordingly, samples of those aforementioned polymers have been irradiated with 60 Co gamma irradiation in air and under vacuum, and also with electron beam, at similar doses. Sinusoidal dynamic oscillation experiments showed a significant increase in branching and crosslinking reactions when specimens are irradiated under vacuum, while scissioning reactions were observed for the different polymers when irradiation takes place under air with either gamma irradiation or electron beam.

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Study of Renewable Silica Powder Influence in the Preparation of Bioplastics from Corn and Potato Starch

et al. 2020

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Chemical, physical, and mechanical properties evolution in electron beam irradiated isotactic polypropylene

Cited by 11 publications

References 28 publications

Biodegradable Films Derived from Corn and Potato Starch and Study of the Effect of Silicate Extracted from Sugarcane Waste Ash

Biodegradable Films Derived from Corn and Potato Starch and Study of the Effect of Silicate Extracted from Sugarcane Waste Ash

Rheological analysis of irradiated crosslinkable and scissionable polymers used for medical devices under different radiation conditions

Study of Renewable Silica Powder Influence in the Preparation of Bioplastics from Corn and Potato Starch

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