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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