Recycling of plastics from packaging

Dintcheva, Nadka Tzankova; Jilov, N.; Mantia, F. P. La

doi:10.1016/s0141-3910(96)00232-7

Cited by 59 publications

(26 citation statements)

References 3 publications

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“…As demais amostras reprocessadas apresentaram valores inferiores. Para DINTCHEVA [18] , de modo geral o reprocessamento (reciclagem) por se tratar de um processo de fusão pode originar degradação oxidativa e termomecânica do polímero, resultando na modificação da estrutura molecular do polímero e ocasionando uma deterioração subsequente das propriedades mecânicas, térmicas e ópticas, alterando a taxa de transmissão de gás, resultando na menor estabilidade térmica.…”

Section: Análise Termogravimétrica (Tga)unclassified

Influência do teor de argila nas propriedades do polipropileno e a reciclagem dos nanocompósitos obtidos por injeção

et al. 2018

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RESUMONeste trabalho foram preparados nanocompósitos de polipropileno e montmorilonita organofílica PP/MMTO, nas concentrações de 1, 2, 5 e 7% pela técnica de intercalação fundida diretamente em uma injetora hidráuli-ca monorosca. O material obtido foi processado, obtendo corpos de prova chamados de primários em formato de gravata. O reprocessamento foi realizado com a moagem do material em um moinho de facas. Logo após, o material moído foi injetado novamente obtendo o segundo ciclo do material e, posteriormente, até atingir o quarto ciclo. As amostras foram avaliadas por microscopia eletrônica de varredura (MEV), ensaio mecânico sob tração, análise termogravimétrica (TGA) e calorimetria exploratória diferencial (DSC). Os resultados de resistência à tração e módulo de Young para as formulações contendo nanoargila não apresentaram alterações significativas, fazendo com que a nanoargila atuasse como carga. As análises de TGA mostraram que quando adicionado 2% MMTO, a temperatura de degradação (T onset ) aumentou 17,10% quando comparada com o PP, sendo esse o melhor resultado encontrado. As curvas de DSC não mostraram variação na temperatura de fusão (T m2 ) para as formulações contendo MMTO e também não para as formulações reprocessadas. Já o grau de cristalização (αc) apresentou variações significativas, tendo como destaque a formulação com 5% de MMTO, onde o αc foi 66,70%, cerca de 26,80 % superior ao polipropileno.Palavras-chave: injeção, montmorilonita organofílica, nanocompósitos, polipropileno, reciclagem. ABSTRACTIn this work, polypropylene and organophilic montmorillonite PP/MMTO nanocomposites were prepared at the concentrations of 1, 2, 5 and 7 % were prepared through the melt intercalation by directly at the single screw hydraulic injector. The obtained material was processed, obtaining specimens called ties in the form of ties. Reprocessing was performed by milling the material in a knife mill. Soon after the ground material was injected again obtaining the second cycle of the material and, later, until reaching the fourth cycle. The samples were evaluated by scanning electron microscopy (SEM), mechanical tensile test, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results of tensile strength and Young's modulus for the nanoclay containing formulations did not show significant changes, causing the nanoclay to act only as a charge. The TGA analysis showed that when 2% MMTO was added, the degradation temperature (Tonset) increased 17.10% when compared to PP, which was the best result found. The DSC curves did not show variation in the melt temperature (Tm2) for the formulations containing MMTO and also for the reprocessed formulations. On the other hand, the degree of crystallization (αc) showed significant variations, with emphasis on the formulation with 5% MMTO, where αc was 66.70%, about 26.80% higher than PP.

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Section: Análise Termogravimétrica (Tga)unclassified

Influência do teor de argila nas propriedades do polipropileno e a reciclagem dos nanocompósitos obtidos por injeção

et al. 2018

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“…Greenhouse covers are made of polyolefins that undergo a slight degradation during processing but a strong photodegradation during their use. It is well known that a photosensitive component in a polymer blend may sensitize the whole material (La Mantia 1986;La Mantia and Curto 1992;La Mantia 1992;Al-Malaika 2002), thus requesting a specific photostabilizing system for the corresponding monopolymer blends (La Mantia and Dintcheva 2004;Herbst et al 1992;Pospisil et al 1995;Pfaendner et al 1995Pfaendner et al , 1996Pospisil et al 1997;Dintcheva et al 1997;Pfaendner et al 1998;Herbst et al 1999;Kartalis et al 2000aKartalis et al , b, 2001Pfaender 2001). In this case, in fact, the recyclate behaves as a pro-degradant as the oxygenated groups generated by UV irradiation during the lifetime act as chromophore promoting further photodegradation processes.…”

Section: With the Same Virgin Polymer (Homopolymer Blends)mentioning

confidence: 99%

Recycling Polymer Blends

Mantia¹,

Scaffaro²

2014

Polymer Blends Handbook

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“…In addition, plastic wastes may contain contaminants and hazardous substances; consequently, environmental concerns and policy issues hinder their reuse [17,18]. The introduction of standardized procedures for the quick and reliable characterization of recycled materials would unquestionably help in the quality assessment of recycled products [19].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2017

International Journal of Chemical and Process Engineering Resea

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Article HistoryThe large amount of post-consumer polyethylene terephthalate (PET) bottles/containers and post-consumer sachet water nylon currently generated in Lagos State makes imperative the search for alternative procedures for treating, recycling or reuse of these waste materials. This is because they are not biodegradable and constitute environmental and health threat to the survival of man and other living things. The sustainable approach to municipal solid waste management in Nigeria is being considered. This research work aimed at recycling of post-consumer PET bottles/containers and post-consumer sachet water nylon to produce composite materials for engineering applications and wastes storage bag (wastes bin) respectively. Plastic waste, polyethylene terephthalate (PET) bottles/containers and sachet water nylon coming from the dumpsites in Lagos State in Nigeria were collected, separated, washed, recycled, extruded and characterized. The products obtained were subjected to tests to evaluate their mechanical properties using Introns Tester Model 1122. The results showed that the PET/LDPE blend mechanical properties depend on the processing conditions and apparatus. High processing temperature and high residence times strongly enhance the degradation processes and reduce the mechanical properties, in particular the elongation at break. However, by introducing additives, such as antioxidants, inert fillers and impact modifiers, these mechanical properties are improved and approached those products made from of virgin polyethylene terephthalate. For the recycled sachet water nylon, the results also showed that there was mechanical properties deficiency in the use of recycled resins and that this deficiency could be minimized through adequate blending with virgin resins. In general, provided that optimal reprocessing conditions with suitable additives, the mechanical properties of the recycled resins are near to those of virgin resins.Contribution/Originality: This study could be able to address the burden of disposed some of these plastic bottle /nylon litter and block the drainages. Also help in area of employment because many idle hands can engage in picking the waste for recycle.

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Recycling of plastics from packaging

Cited by 59 publications

References 3 publications

Influência do teor de argila nas propriedades do polipropileno e a reciclagem dos nanocompósitos obtidos por injeção

Influência do teor de argila nas propriedades do polipropileno e a reciclagem dos nanocompósitos obtidos por injeção

Recycling Polymer Blends

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