Influência da modificação da argila montmorilonita nas propriedades mecânicas, termo-mecânicas e morfológicas de nanocompósitos de blendas de poliamida 6/Acrilonitrila-EPDM-estireno

Abstract

ResumoO efeito da organofilização da argila no comportamento mecânico, morfológico e termo-mecânico de nanocompósitos baseados em blendas de poliamida 6 )/acrilonitrila-EPDM-estireno foi estudado. Três nanoargilas foram utilizadas para a preparação dos nanocompósitos: duas montmorilonitas comerciais modificadas organicamente (Cloisite  30B and Cloisite  20A) e uma montmorilonita sódica não modificada (Cloisite  Na + ). Difração de raios-X em alto ângulo, microscopia eletrônica de transmissão e testes de tração e resistência ao impacto foram utilizados para avaliar o efeito da organofilização da nanoargila na morfologia e propriedades mecânicas dos materiais. As propriedades termo-mecânicas foram avaliadas por análise dinâmico mecânica e temperatura de deflexão térmica. Os resultados mostraram que a modificação da nanocarga afeta simultaneamente o grau de reforço da matriz, dispersão das lamelas de argila na blenda e tamanho da fase dispersa AES. A adição das diferentes nanoargilas aumenta o módulo elástico de todos os nanocompósitos ternários em relação à blenda pura sem argila. Por outro lado, um aumento na tenacidade foi obtido apenas para os sistemas com Cloisite  Na + . Um aumento significativo no módulo de armazenamento e HDT foi observado pela incorporação da Cloisite  30B na blenda. Palavras-chave: organofilização, nanocompósitos, blendas, nanoargilas. AbstractThe effect of clay organophilization on mechanical, morphological and thermo-mechanical behavior of polyamide-6/acrylonitrile-EPDM (ethylene/propylene/diene elastomer)-styrene blends was studied. Three nanoclays were used for the preparation of nanocomposites: two commercial organically modified montmorillonites (Cloisite  30B and Cloisite  20A) and an unmodified sodium montmorillonite (Cloisite  Na + ). We used wide angle X-ray scattering, transmission electron microscopy and mechanical tests to evaluate the effect of clay modification on the morphology and mechanical properties of the nanocomposites. The thermo-mechanical properties were characterized using dynamic mechanical analysis and heat distortion temperature (HDT). The results show that the modification of clay affected simultaneously the degree of PA6 matrix reinforcement, dispersion of the clay lamellas in the blend and size of the dispersed phase AES. The incorporation of different nanoclays increase the elastic modulus of all the ternary nanocomposites compared to the neat blend. An increase in the toughness is obtained only for systems with Cloisite  Na + . A significant increment in the storages modulus and HDT was observed by the incorporation of Cloisite  30B in the PA6/AES blends.

Tuning the performance of PA6/EPDM‐MA nanocomposites reinforced with Ni0.5Zn0.5Fe2O4. Effect of the mixing protocol on mechanical, thermal, thermomechanical, magnetic, and morphological behavior

“…This indicates that Ni‐Zn ferrite reduced the dissipation energy capacity of PA6/EPDM‐MA, since it is rigid nanofiller and concentrated stresses. Similar behavior was also previously observed [ 30 ] in PA6/AES (acrylonitrile‐EPDM‐styrene) nanocomposites with nanoclays, indicating reduction in toughness due to stress concentration.…”

“…It is reported, the production of toughened PA6 nanocomposites through addition of clays, [30,31] carbon nanotubes, [32,33] and graphene, [34] specially focusing on mechanical, thermal, electrical properties, and morphology. These reported nanofillers have contributed to the PA6 nanocomposites toughening advance, nevertheless, the literature is still scarce in magnetic nanofillers related researches.…”

Effect of nonmodified and organically modified montmorillonite incorporation on polyamide 6/acrylonitrile‐ethylene‐propylene‐diene‐styrene/methyl methacrylate‐co‐maleic anhydride system

“…WAXD patterns of (i) Cloisite® Na + ; (ii) Nano Na + ; (iii) Cloisite® 30B; and (iv) Nano 30B. a Adapted from 17 …”

Tailoring Nylon 6/Acrylonitrile-Butadiene-Styrene Nanocomposites for Application against Electromagnetic Interference: Evaluation of the Mechanical, Thermal and Electrical Behavior, and the Electromagnetic Shielding Efficiency

“…Nylon 6 is considered a pseudo-ductile polymer, having high resistance to crack initiation compared with brittle polymer matrices. However, it is inherently brittle in the presence of stress concentrators, such as a notch [ 17 ]. Some works have addressed this problem by designing Nylon 6/clay nanocomposites [ 18 , 19 ].…”