Resumo: Nanocompósitos de poliamida 6 e argila organofílica claytone 40 foram preparados por intercalação por fusão, utilizando misturador de câmara interna equipado com rotores do tipo Roller. A adição de teores crescentes de claytone 40 na matriz de PA6 foi avaliada quanto ao grau de dispersão, cristalinidade, propriedades térmicas e as propriedades mecânicas. As composições obtidas foram caracterizadas por difração de raios X (DRX), calorimetria diferencial de varredura (DSC), microscopia eletrônica de varredura (MEV) e propriedades mecânicas. Os difratogramas e as micrografias sugeriram a ocorrência de formação de estruturas parcialmente esfoliadas e/ ou intercaladas, fato que foi associado com o aumento nos valores de tensão e o módulo elástico. A comparação entre os resultados de DSC e DRX das misturas revelaram alterações estruturais na cristalinidade em relação à PA6 correlacionando a cristalinidade à variação nas propriedades mecânicas. Palavras-chave: Nanocompósitos, montmorilonita, argila organofílica, poliamida 6. Nanocomposites of Polyamide 6 and Organoclay: Crystallinity and Study of Mechanical PropertiesAbstract: Nanocomposites of polyamide 6 and Claytone 40 organoclay were prepared with the melt intercalation technique using an internal mixer chamber coupled with roller type rotors. The addition of increasing amounts of Claytone 40 into the PA6 matrix was evaluated for the degree of dispersion, crystallinity, thermal and mechanical properties. The compositions were characterized with X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and mechanical properties. The diffraction patterns and microscope images suggest the formation of partially exfoliated or intercalated structures, which was associated with an increase in stress values and elastic modulus. The comparison of DSC and XRD results from the mixtures revealed changes in the behavior of crystalline structures, thus indicating that the PA6 crystallinity is correlated with the mechanical properties. Keywords: Nanocomposites, montmorillonite, organoclays, polyamide 6. IntroduçãoNanocompósitos de polímeros e silicatos em camadas são materiais que representam uma alternativa muito vantajosa em relação aos compósitos de polímeros com cargas convencionais. Silicatos como a montmorilonita têm sido extensivamente reportado na literatura como cargas reforçantes de matrizes poliméricas por suas caracterísitcas geométricas: dimensões da ordem do nanômetro e de elevada razão de aspecto e área superficial. O emprego de quantidades mínimas desses silicatos (menor do que 10%) como fase dispersa em polímeros já são suficientes para promover aumento nas propriedades térmicas, mecânicas, de barreira, inflamabilidade e estabilidade dimensional dos nanocompósitos quando comparados aos compósitos convencionais que requerem uma quantidade de 30 a 40% de reforço [1][2][3][4][5][6] . Devido às características hidrofílicas da montmorilonita, pouca dificuldade deve ser encontrada no desenvolvimento de nanocompósitos ...
Abstract3D printing plays an important role in Industry 4.0 and has versatility to use different materials, including thermoplastic polymers. Polylactic acid (PLA), a bio‐based biodegradable polymer, is used as a potential replacement for petroleum‐based polymers in several applications, and is one of the most popular polymers used in 3D printing. Inorganic/organic nanoparticles can be incorporated in polymers to improve various properties such as thermal, mechanical, and tribological. This work investigates the effect of adding carbon black (CB) and alumina (ALM) nanofillers on the thermal, mechanical, and tribological properties of 3D printed PLA nanocomposites for tribological applications. Both nanofillers promoted progressive enhancement of thermal stability according to TGA. The improvement in the interaction between nanofillers and PLA matrix is revealed by an increase in viscosity of the nanocomposites. The nanocomposites containing 25%wt ALM and 75wt% CB presented better mechanical and wear properties, suggesting synergism between nanofillers and that CB may act as a compatibilizer between PLA and ALM. These results enable selecting the most suitable composition of nanofillers to be added to PLA to create filaments with better tribological properties.
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