Influence of accelerated aging on clay-reinforced polyamide 6

Kiliaris, Pantelis; Papaspyrides, Constantine; Pfaendner, Rudolf

doi:10.1016/j.polymdegradstab.2008.11.016

Cited by 72 publications

(58 citation statements)

References 50 publications

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“…Entretanto, devido à natureza das ligações, os grupos ésteres do PET são mais susceptíveis à hidrólise do que os grupos amidas das poliamidas [14] .…”

Section: Massa Molar Viscosimétrica Do Petunclassified

Reciclagem de rejeitos de poli(tereftalato de etileno) (PET) e de poliamida (PA) por meio de extrusão reativa para a preparação de blendas

2011

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Resumo: O consumo crescente de materiais poliméricos em diversas formas de aplicação leva à produção de uma quantidade enorme de resíduos pós-consumo e pós-industriais com potencial poluidor elevado. A reciclagem mecânica é uma das maneiras mais adequadas para contornar os problemas gerados por estes rejeitos, uma vez que permite conciliar interesse econômico com benefícios ambientais. Neste trabalho foi feito um estudo sobre a reciclagem de rejeitos pós-industriais de poli(tereftalato de etileno) (PET) provenientes da fabricação de mantas de tecido não tecido e de resíduos de poliamida (PA) oriundos de pneus usados na forma de blendas, produzidas por meio de extrusão reativa dos dois resíduos em presença de catalisador. Os resultados obtidos a partir de caracterização térmica e química das blendas evidenciaram a ocorrência de trans-reações entre segmentos de cadeia polimérica dos dois polímeros, possibilitando a compatibilização do sistema. A produção de blendas PET/PA se configura como uma forma adequada para a reciclagem dos rejeitos de PET e de PA. Palavras-chaves: Reciclagem, PET, poliamida, blendas, extrusão reativa. Recycling of Wastes from Poly(ethylene tereftalate) (PET) and Polyamide (PA) by Reactive Extrusion for Preparation of Polymeric BlendsAbstract: The increasing use of polymeric materials in several applications leads to the production of a high amount of post consume and post industrial wastes with expressive pollutant potential. Mechanical recycling is an important way to decrease the problems caused by these wastes because it allows one to associate economic viability with environmental benefits. In this paper a study was carried out on the recycling of poly(ethylene tereftalate) (PET) wastes from the production of nonwoven fabrics (NWF) and of polyamide (PA) wastes from old tires for production of polymeric blends via reactive extrusion in the presence of trans-reaction catalysts. The results from thermal and chemical characterization indicated trans-reactions between segments of polymeric chains of the two polymers, promoting the system compatibilization. The production of PET/PA blends is an interesting alternative for recycling PET and PA wastes. Keywords: Recycling, PET, polyamide, blends, reactive extrusion. IntroduçãoOs resíduos poliméricos pós-consumo e pós-industriais são fontes de poluição que causam inúmeros problemas ambientais e também representam um desafio para o gerenciamento do lixo em grandes cidades. Com o consumo crescente de polímeros em diversos setores da indústria, estes problemas tendem a ser agravados se não forem adotadas políticas eficientes de reciclagem destes materiais. A produção de polímeros no mundo em 1999 foi de 168 milhões de toneladas, com previsão estimada em 210 milhões de toneladas em 2010 [1] .Uma parcela considerável dos polímeros termoplásticos é aplicada para a confecção de embalagens que apresentam uma vida útil muito curta e rapidamente se constituem em resíduos sólidos, ocupando boa parte do volume dos aterros sanitários, como é o caso do poli(t...

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“…Entretanto, devido à natureza das ligações, os grupos ésteres do PET são mais susceptíveis à hidrólise do que os grupos amidas das poliamidas [14] .…”

Section: Massa Molar Viscosimétrica Do Petunclassified

Reciclagem de rejeitos de poli(tereftalato de etileno) (PET) e de poliamida (PA) por meio de extrusão reativa para a preparação de blendas

2011

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“…The increase in the flammability by the K-10 in the second half of the combustion showed the advantages of using nanoclay rather than micronclay in an intumescent system (Levchik et al, 1999). Organically modified clay-reinforced polyamide 6 was subjected to accelerated heat aging to estimate its long-term thermo-oxidative stability and useful lifetime compared to the virgin material (Kiliaris et al, 2009). Changes in molecular weight and thermal and mechanical properties were monitored and connected to the polymer modification encountered during aging.…”

Section: Age and Durability Performancementioning

confidence: 99%

Nanocomposites for Vehicle Structural Applications

Njuguna¹,

Silva²,

Sachse³

2011

Nanofibers - Production, Properties and Functional Applications

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“…5 In general, the exposure of polymers to UV-visible light can cause photo-oxidation, which implies modifications in the chemical structure of the macromolecular chains, variation of molecular weight and changes in a material morphology, all leading to a decrease in the macroscopic mechanical properties. [24][25][26] The effect of photo-oxidation of PEBAs is not extensively reported in the literature, while considerable research has been focused on the UV-oxidative ageing behaviour of PA. 27,28 In PAs, the inter-chain hydrogen bond on the methylene group adjacent to nitrogen is considered to be the weakest bond, where an oxidation reaction is initiated upon UV light exposure, resulting in a decrease in molecular weight, subsequent deterioration in physical and mechanical properties, increased yellowing and eventual embrittlement of PA. 29 However, other environmental agents, such as water, should not be underestimated since they play an important role in the evolution of degradation in polymers, affecting mechanical behaviour. In particular, the effect of water on the structure and properties of PEBAs with different PA/PE ratios was recently studied.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the mechanical behaviour of Telemark ski boots: Part I – materials characterization in use conditions

Natali

Todros

Venturato

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part P:

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This study reports the first part of the analysis for the evaluation of the mechanical behaviour of ski boots by means of an integrated approach that considers polymeric materials characterization, in Part I, and numerical structural analysis, in Part II. In the present Part I, different techniques are adopted to characterize the mechanical behaviour of the polymeric materials used for ski boots, to define the elastic, visco-elastic, temperature and weathering-dependent characteristics. Experimental data provide fundamental information on mechanical response, in particular taking into account the effect of the environmental conditions, due to temperature variation, ultraviolet radiation and water absorption, which are correlated to the definition of reliability and durability of the materials. In more detail, experimental results from tensile tests and dynamic mechanical analysis are reported, evaluating mechanical response and chemical conformation of the polymers. Materials properties are correlated with the specific use conditions and boot structure, to be able to evaluate and preserve overall performances and general safety requirements of ski boots. This activity represents a reference procedure for the evaluation of the material mechanical behaviour that must be considered within the structural analysis.

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Influence of accelerated aging on clay-reinforced polyamide 6

Cited by 72 publications

References 50 publications

Reciclagem de rejeitos de poli(tereftalato de etileno) (PET) e de poliamida (PA) por meio de extrusão reativa para a preparação de blendas

Reciclagem de rejeitos de poli(tereftalato de etileno) (PET) e de poliamida (PA) por meio de extrusão reativa para a preparação de blendas

Nanocomposites for Vehicle Structural Applications

Evaluation of the mechanical behaviour of Telemark ski boots: Part I – materials characterization in use conditions

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