Avaliação da Biodegradação de Poli-beta-(Hidroxibutirato), Poli-beta-(Hidroxibutirato-co-valerato) e Poli-épsilon-(caprolactona) em Solo Compostado

Rosa, Derval S.; Chui, Queenie Siu Hang; Filho, Rubens Pantano; Agnelli, José Augusto Marcondes

doi:10.1590/s0104-14282002000400015

Cited by 44 publications

(53 citation statements)

References 6 publications

(6 reference statements)

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“…Another paper 54 reports that the crystallinity of PHB can vary 35 to 45% depending on the experimental parameters. However, these results are considered relatively low compared with other published studies 16,51 . This difference may be explained due to different molar mass values of PHB used in the referenced papers.…”

Section: Crystallinity Degreecontrasting

confidence: 67%

Polyhydroxybutyrate Composites with Random Mats of Sisal and Coconut Fibers

et al. 2016

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Biodegradable polymeric composites using natural fibers have been investigated aiming to mitigate environmental impacts. In this paper, polyhydroxybutyrate (PHB) composites obtained using random mats of sisal and coconut fibers by compression molding in a hydraulic press, and the fiber content varied between 10% and 15% relative to the weight of the polymer. Thermal analyses were performed such as Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). Flexural and tensile tests were performed before and after conditioning in climate chamber with temperature and moisture. The results of thermal analysis show that the thermal stability of the materials remained, both PHB without fiber as for composites with natural fibers mats. The results of mechanical tests indicated that the PHB without fibers and composites showed similar flexural strength values, while the results of the tensile test PHB without fibers showed resistance to higher tensile composite.

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Section: Crystallinity Degreecontrasting

confidence: 67%

Polyhydroxybutyrate Composites with Random Mats of Sisal and Coconut Fibers

et al. 2016

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“…Para o gerenciamento da enorme quantidade de lixo plástico produzido pela sociedade, a biodegradação é uma das alternativas que tem sido proposta e atualmente têm sido alçada a uma posição de destaque. A biodegradação consiste na degradação dos materiais poliméricos através da ação de organismos vivos [4] . A American Society for Testingand Materials (ASTM) tem proposto vários métodos de análise e acompanhamento da biodegradação dos polímeros, que consistem em ensaios de biodegradabilidade em exposição a microrganismos por meio de compostos em ambientes aeróbicos e anaeróbicos.…”

Section: Introductionunclassified

Influência da argila vermiculita brasileira na biodegradação de filmes de PHB

et al. 2015

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ResumoEste trabalho teve como objetivo preparar e avaliar filmes PHB/vermiculita natural e modificada nas quantidades em peso de 1%, 3% e 6% através dos métodos intercalação por fusão e intercalação por solução. Os bionanocompósitos obtidos pelo método intercalação por fusão foram preparados em uma extrusora monorosca e posteriormente os filmes foram moldados via compressão. Na preparação dos filmes por solução, os sistemas foram submetidos à agitação e aquecimento a 80 °C. Os sistemas foram avaliados por difração de raios-X e o comportamento de biodegradação foi avaliado de acordo com a norma ASTM G 160-03. O acompanhamento da biodegradação foi realizado por meio de inspeção visual e perda de massa. Observou-se que o percentual de argila e o método de obtenção dos filmes influenciaram na estrutura formada e na biodegradação dos sistemas. Palavras-chave: polímeros biodegradáveis, argila vermiculita, ensaio de biodegradação, bionanocompósitos. AbstractThis study aimed to prepare and to evaluate natural and modified PHB /vermiculite films in quantities of 1%, 3% and 6% by weight, through melt intercalation and solution intercalation methods. The bionanocomposites in the form of thin films, obtained by the melt intercalation method, were prepared in a single screw extruder and then molded via compression. In the preparation of the films by solution method, the systems were stirred and heated at 80 °C in the presence of the chloroform solvent. The systems were evaluated by X-ray diffraction and the degradation behavior was evaluated according to ASTM G 160-03, by visual inspection and through weight loss. It was observed that the percentage of clay and the method of obtaining of the films influenced in the structure and biodegradability of the systems.

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“…1 Interest in biodegradable polymers has been growing rapidly in recent years; it could become an alternative for the problems of current environmental pollution generated by plastic garbage. 2,3 The importance of the study of low-density polyethylene (LDPE) biodegradable formulations is motivating much research in this area.…”

Section: Introductionmentioning

confidence: 99%

Effect of the radiolitic sterilization in polyethylene/starch blends

Ferreira¹,

Lima²,

Almeida³

et al. 2008

Quím. Nova

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Recebido em 20/3/07; aceito em 11/10/07; publicado na web em 2/4/08Samples of LDPE/modified starch blends 80/20 m/m before and after exposure to gamma rays were examined by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction. The effect of gamma radiation is clearly seen in the samples irradiated at a dose of 25 kGy. The main alteration in the polymeric material after exposure at the radiation range was a decrease in the mechanical properties, alterations in the chemical structure of the blend with an increase in the carbonyl and vinyl indices and the appearance of new crystalline symmetry generating a crystalline domain not existing before in the blend.

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Avaliação da Biodegradação de Poli-beta-(Hidroxibutirato), Poli-beta-(Hidroxibutirato-co-valerato) e Poli-épsilon-(caprolactona) em Solo Compostado

Cited by 44 publications

References 6 publications

Polyhydroxybutyrate Composites with Random Mats of Sisal and Coconut Fibers

Polyhydroxybutyrate Composites with Random Mats of Sisal and Coconut Fibers

Influência da argila vermiculita brasileira na biodegradação de filmes de PHB

Effect of the radiolitic sterilization in polyethylene/starch blends

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