Biodegradable Polymers
Mostrando 13-24 de 114 artigos, teses e dissertações.
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13. Polyvinyl alcohol (PVA) molecular weight and extrusion temperature in starch/PVA biodegradable sheets
Abstract The aim of this work was to study the relationship of chain size of partially hydrolyzed PVA blended with starch in properties of biodegradable sheets produced by thermoplastic extrusion. It was also studied the effect of extrusion temperature profile to determine the better PVA chain size and temperature profile to produce biodegradable sheets thr
Polímeros. Publicado em: 10/07/2018
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14. Water-uptake properties of a fish protein-based superabsorbent hydrogel chemically modified with ethanol
Abstract Hydrophilic polymers can form hydrogels, which are able to absorb and retain as much water as one hundred times their weight. Polymers based on natural products have been drawing attention since they are biocompatible, biodegradable and nontoxic. The aims of this study were to produce and to characterize a biopolymer with superabsorbent properties
Polímeros. Publicado em: 06/07/2018
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15. Molecular dynamics studies of amylose plasticized with Brazilian Cerrado oils: part I
Abstract Biodegradable polymers have become part of the realm of polymer science with specially when associated to renewable sources. Unraveling the plasticizer effect of natural occurring fatty acids in the Brazilian Cerrado on amylose oligomers was aimed in this work in an aqueous environment. Since the interactions within a material are of extreme import
Polímeros. Publicado em: 28/06/2018
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16. POLÍMERO BIODEGRADÁVEL ANTIMICROBIANO ATRAVÉS DA ADITIVAÇÃO COM COMPOSTOS À BASE DE ZINCO
Antimicrobial packaging is a promising type of active packaging, which has an antimicrobial agent incorporated into the polymer matrix, capable to eliminate or inhibit deteriorating and/or pathogenic microorganisms. The zinc compounds are antimicrobial agents commonly used to confer this feature. The objective of this work was to evaluate the antimicrobial a
Quím. Nova. Publicado em: 2018-04
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17. HIDROGÉIS NANOCOMPÓSITOS DE POLISSACARÍDEO COM ZEÓLITA: AVALIAÇÃO DO PROCESSO DE ADSORÇÃO DO PESTICIDA PARAQUAT
In this work, nanocomposites formed from the natural polymer carboxymethylcellulose in combination with the polyacrylamide polymer and zeolite were obtained and characterized in relation to pesticide sorption capability. Hydrogels are three-dimensional network with large capacity of water or biological fluid adsorption. They have biocompatibility, biodegrada
Quím. Nova. Publicado em: 2018-04
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18. New technologies from the bioworld: selection of biopolymer-producing microalgae
Abstract Microalgae are studied because of their biotechnological potential. The growth of microalgae aims at obtaining natural compounds. Due to the large amount of accumulated polymer waste, one of the solutions is the use of biodegradable polymers. The objective of this work was to select biopolymer-producing microalgae and to study the cell growth phase
Polímeros. Publicado em: 2017-12
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19. The influence of natural clay and organoclay vermiculite on the formation process of bionanocomposites with poly (3-hydroxybutyrate-co-3-hydroxyvalerate)
ABSTRACT During the last decades, a lot of research work focused on several biodegradable and biosourced polyesters for the purpose of reducing the non-degradable polymer wastes. These polyesters are particularly considered to be promising polymers for biomedical applications and short life-time products like packaging. As these packagings are rapidly discar
Matéria (Rio J.). Publicado em: 02/10/2017
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20. IN SITU MONITORING OF A CONTROLLED RELEASE OF FERTILIZERS IN LETTUCE CROP
ABSTRACT: Agriculture has sought ways to increase food production to meet global demands, intensifying dependence on natural resources. An alternative for intensive production has relied on the use of “smart” fertilizers that release nutrients in a controlled manner. Biodegradable polymers containing fertilizers has presented economic and environmental a
Eng. Agríc.. Publicado em: 2017-08
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21. Thermo-Mechanical Properties of P(HB-HV) Nanocomposites Reinforced by Nanodiamonds
Several studies of biodegradable polymers and copolymers have been carried for different applications in the biomedical area. This current study aims to develop a biocomposite to be used as an orthopedic device, using poly(3-hydroxybutyrate-co-3-hydroxyvalerate) P(HB-HV), a biodegradable copolymer, with 94%HB and 6%HV, as matrix; and nanodiamonds (ND) with p
Mat. Res.. Publicado em: 26/06/2017
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22. FILMES BIODEGRADÁVEIS DE AMIDO DE MANDIOCA, PULULANA E CELULOSE BACTERIANA
The largest consumption of plastics in the world is referred to the synthetic polymers, which are not biodegradable and have a non-renewable source, generating a large environmental impact, especially in urban centers. As a result, in the last two decades several polymers obtained from renewable sources (biopolymers) have been studied as potential raw materi
Quím. Nova. Publicado em: 2016-11
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23. Biodegradation Study of a Novel Poly-Caprolactone-Coffee Husk Composite Film
Abstract Plastic disposal is a worldwide issue due to its long degradation time. Environmentally degradable polymers (EDPs) have received considerable attention because of their faster degradation. However, the use of EDPs is limited by high cost and restricted properties. The incorporation of organic fillers is an alternative to reduce cost while increasing
Mat. Res.. Publicado em: 13/05/2016
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24. Water Susceptibility and Mechanical Properties of Thermoplastic Starch–Pectin Blends Reactively Extruded with Edible Citric Acid
Pectin and starch are edible, non-toxic, biodegradable and obtained from renewable sources. Also, have the benefit to be easily cross-linked producing hydrogels. Reactive extrusion with edible citric acid and cross linking interactions was evaluated on extruded thermoplastic in natura and cationic starch-pectin blends. Materials water susceptibility and mech
Mat. Res.. Publicado em: 05/02/2016