Effect of environment on the degradation of starch and pro-oxidant blended polyolefins

Muthukumar, Thangavelu; Aravinthan, Adithan; Doble, Mukesh

doi:10.1016/j.polymdegradstab.2010.07.017

Cited by 66 publications

(40 citation statements)

References 35 publications

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“…A formação de grupos carbonílicos ocorre principalmente através da cisão-β de radicais peroxílicos e alcoxílicos [13] . Muthukumar et al [14] , analisando degradação de blendas poliolefínicas com amido e aditivos pró-oxidantes, observou que o aumento da intensidade das bandas características dos grupos carbonila e ésteres mostra claramente que esta acontecendo foto-oxidação.…”

Section: Efeito Do Tratamento Em Câmara De Envelhecimento Na Estruturunclassified

Efeito da incorporação de nanopartículas de TiO2 na estrutura e propriedades de blendas de polipropileno e poli(hidroxibutirato) submetidas a testes de envelhecimento acelerado

2014

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Resumo: O polipropileno (PP) tem uma degradação natural lenta e representa um importante constituinte na gestão dos resíduos sólidos, enquanto o poli(hidroxibutirato) (PHB) é um polímero biodegradável, mas tem as desvantagens de dificuldade de processamento e custo. O objetivo deste trabalho foi avaliar o efeito de nanopartículas de TiO 2 , do método de processamento e do envelhecimento acelerado na estrutura e propriedades da mistura PP/PHB/TiO 2 . As amostras foram produzidas por etapas de extrusão e injeção e foram caracterizadas por MEV/EDS, FTIR e análise térmica. Os resultados mostraram que a incorporação de 3% de nanopartículas de TiO 2 levou a um aumento do tamanho médio da fase dispersa rica em PHB. A mudança na sequência da adição de nanopartículas de TiO 2 permitiu guiar a incorporação desses nanocomponentes para a fase rica em PP. As misturas produzidas se mostraram mais estáveis termicamente do que PHB puro e a adição de TiO 2 foi eficaz em aumentar a estabilidade térmica dos compósitos. As análises termogravimétricas e por FTIR mostraram que blendas contendo nanopartículas de TiO 2 tiveram sua degradação mais afetada nos ensaios de envelhecimento acelerado. Os ensaios de extração com solvente mostraram que um maior conteúdo de produtos de fotodegradação puderam ser extraídos de amostras contendo mais elevadas concentrações de TiO 2 . Palavras-chave: Polipropileno(PP), poli(hidroxibutirato) (PHB), compósitos, TiO 2 . Effect of the Incorporation of TiO 2 Nanoparticles on the Behavior of Polypropylenepoly(hydroxybutyrate) Blends Submitted to Accelerated Aging TestsAbstract: Polypropylene (PP) has a slow natural degradation rate. On the other hand, poly(hydroxybutyrate) (PHB) is biodegradable but has the disadvantages of cost and difficulty of processing. The aim of this work was to evaluate the effect of TiO 2 nanoparticles, processing conditions and accelerated aging on the structure and properties of PP/PHB/ TiO 2 mixtures. Samples were prepared by extrusion and injection molding. The incorporation of 3% TiO 2 nanoparticles led to an increase in the average size of the dispersed phase rich in PHB. Changes in the sequence of TiO 2 nanoparticles incorporation were able to guide the inclusion of nanoparticles to the PP-rich phase. The produced composites were more thermally stable than pure PHB and the incorporation of TiO 2 was effective to increase the thermal stability of the composites. Thermal and FTIR analyses showed that blends containing TiO 2 nanoparticles had their degradation more affected by accelerated aging treatments. Solvent extraction results revealed that a larger amount of soluble products from the photodegradation could be extracted from samples containing TiO 2 submitted to accelerated aging treatments.

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Section: Efeito Do Tratamento Em Câmara De Envelhecimento Na Estruturunclassified

Efeito da incorporação de nanopartículas de TiO2 na estrutura e propriedades de blendas de polipropileno e poli(hidroxibutirato) submetidas a testes de envelhecimento acelerado

2014

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“…Our results are in accordance with the findings of Feuilloley et al [18] that very small degree of degradation occured on PE films in soil. Muthukumar et al [23] also do not suggest buriing plastics in soil, since they found no degradation.…”

Section: Discussionmentioning

confidence: 95%

“…The consortium was capable of degrading the poronized form of LDPE much easiler. Muthukumar et al [23] studied the rate of degradation of commercial pro-oxidant blended and starch blended HDPE, LDPE, and PP under direct sunlight, buried in soil and immersed in marine waters for a period of 150 days. Exposure to sunlight showed highest weight loss (>10%) and samples buried in soil showed the lowest (1%).…”

Section: Introductionmentioning

confidence: 99%

“…Exposure to sunlight showed highest weight loss (>10%) and samples buried in soil showed the lowest (1%). Therefore it is not suggested burying plastics in soil and no common disposal strategy can be adopted for the different polyolefins [23]. The biodegradability of PE/starch blends was investigated by a great number of authors [23][24][25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

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Behavior of Polyethylene Films in Soil

Vargha

Rétháti

Heffner

et al. 2016

Period. Polytech. Chem. Eng.

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“…The results are in agreement with some weight Soya powder content (wt%) Figure 10 Comparison of weight loss for uncompatibilized and compatibilized blends after weathering. loss studies in LDPE/starch blends [12,13], in which the starch is a highly hydrophilic material.…”

Section: Crystallinity Studymentioning

confidence: 99%

Degradation of epoxidized natural rubber compatibilized linear low density polyethylene/ soya powder blends: the effect of natural weathering

Sam

Ismail²,

Khalil

2013

Journal of Polymer Engineering

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Abstract:In the present study, linear low density polyethylene (LLDPE)/soya powder blends were compatibilized with epoxidized natural rubber (ENR 50) and exposed to natural weathering. The exposure period for the blends was 1 year. It was found that the degradability of the compatibilized blends was higher than that of uncompatibilized blends. Fourier transform infrared (FTIR) spectra, the tensile test, scanning electron microscopy (SEM), and differential scanning calorimetry (DSC) were applied to analyze the degradability of the blends. IR spectra showed that the carbonyl index (CI) of the blends increased as a function of exposure period and soya powder content. The compatibilized blends gave higher carbonyl indices. The retention tensile strength and elongation at break (E b ) of the compatibilized blends after weathering was generally lower than for the uncompatibilized blends. The increase of crystallinity also indicated a reduction of the amorphous portion after degradation. The higher crystallinity in compatibilized blends further confirms the higher degradability of ENR 50 compatibilized blends. The weight loss and molecular weight change indicated that the incorporation of ENR 50 into LLDPE/soya powder blends can enhance the degradability of the blends upon outdoor exposure.

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Effect of environment on the degradation of starch and pro-oxidant blended polyolefins

Cited by 66 publications

References 35 publications

Efeito da incorporação de nanopartículas de TiO2 na estrutura e propriedades de blendas de polipropileno e poli(hidroxibutirato) submetidas a testes de envelhecimento acelerado

Efeito da incorporação de nanopartículas de TiO2 na estrutura e propriedades de blendas de polipropileno e poli(hidroxibutirato) submetidas a testes de envelhecimento acelerado

Behavior of Polyethylene Films in Soil

Degradation of epoxidized natural rubber compatibilized linear low density polyethylene/ soya powder blends: the effect of natural weathering

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