Microstructural correlations to micromechanical properties of polyamide-6/low density polyethylene-grafted-maleic anhydride/nanoclay ternary nanocomposites
“…Polymer blend nanocomposites may lead to a new type of high performance material that combines the advantages of polymer blends and the merits of polymer nanocomposites [10,11]. Consequently, two types of PA blend-based nanocomposite have been studied by numerous researchers, i.e., PA nanocomposites prepared by thermoplastic-thermoplastic blending and rubber (both functionalized and un-functionalized) modification approaches: (a) PA nanocomposites with a matrix composed of a blend of two thermoplastics (for example, PA6/PP/nanoclay [1,[12][13][14][15][16][17][18], PA6/polyimide/ organoclay [19]; PA6/thermotropic liquid crystalline polymer (TLCP)/organoclay [20]; Nylon 66/Nylon 6/organoclay [21]; PA6/acrylonitrile-butadiene-styrene (ABS)/multi-walled carbon nanotube (MWNT) [4,22]; PA6/low density polyethylene (LDPE)/nanoclay [23]; PA6/LDPE/organoclay [24]; polyamide 12 (PA12)/PP/boehmite alumina nanoparticles [25]; PA6/polymethyl methacrylate (PMMA)/functionalized single-walled carbon nanotube (SWCNT) [26]; PA6/polystyrene (PS)/nanoclay [27]; PA6/PS/nanosilica [28]) (b) PA nanocomposites toughened by a rubber or rubber-modified PA6 nanocomposites (for example, PA6/maleated styrene-ethylene butylenestyrene (SEBS-g-MA)/montmorillonite [29]; PA6/maleinized ethylene-propylene-rubber (mEPR)/nanoclay [30]; PA6/ethylene-co-propylene maleated rubber/organoclay [31]; PA6/silicone rubber/clay [32]; PA66/SEBS-g-MA/organoclay [33]; PA6/metallocene ethylene-polypropylene-diene copolymer/maleated ethylenepolypropylene-diene copolymer (EPDM-g-MA)/ nanoclay [34]; PA6/maleinized ethylene propylene-diene monomer (mEPDM)/nanoclay [35]; PA6/maleinized styrene-ethylene-butylenestyrene (mSEBS)/nanoclay [36][37][38]; PA6/ maleated ethylene-propylene-diene rubber (EPDM-g-MA)/organoclay …”
“…Polymer blend nanocomposites may lead to a new type of high performance material that combines the advantages of polymer blends and the merits of polymer nanocomposites [10,11]. Consequently, two types of PA blend-based nanocomposite have been studied by numerous researchers, i.e., PA nanocomposites prepared by thermoplastic-thermoplastic blending and rubber (both functionalized and un-functionalized) modification approaches: (a) PA nanocomposites with a matrix composed of a blend of two thermoplastics (for example, PA6/PP/nanoclay [1,[12][13][14][15][16][17][18], PA6/polyimide/ organoclay [19]; PA6/thermotropic liquid crystalline polymer (TLCP)/organoclay [20]; Nylon 66/Nylon 6/organoclay [21]; PA6/acrylonitrile-butadiene-styrene (ABS)/multi-walled carbon nanotube (MWNT) [4,22]; PA6/low density polyethylene (LDPE)/nanoclay [23]; PA6/LDPE/organoclay [24]; polyamide 12 (PA12)/PP/boehmite alumina nanoparticles [25]; PA6/polymethyl methacrylate (PMMA)/functionalized single-walled carbon nanotube (SWCNT) [26]; PA6/polystyrene (PS)/nanoclay [27]; PA6/PS/nanosilica [28]) (b) PA nanocomposites toughened by a rubber or rubber-modified PA6 nanocomposites (for example, PA6/maleated styrene-ethylene butylenestyrene (SEBS-g-MA)/montmorillonite [29]; PA6/maleinized ethylene-propylene-rubber (mEPR)/nanoclay [30]; PA6/ethylene-co-propylene maleated rubber/organoclay [31]; PA6/silicone rubber/clay [32]; PA66/SEBS-g-MA/organoclay [33]; PA6/metallocene ethylene-polypropylene-diene copolymer/maleated ethylenepolypropylene-diene copolymer (EPDM-g-MA)/ nanoclay [34]; PA6/maleinized ethylene propylene-diene monomer (mEPDM)/nanoclay [35]; PA6/maleinized styrene-ethylene-butylenestyrene (mSEBS)/nanoclay [36][37][38]; PA6/ maleated ethylene-propylene-diene rubber (EPDM-g-MA)/organoclay …”
“…[22], el cual es mayor que los obtenidos en este estudio, esto se debe al menor grado de funcionalización y/o baja interacción entre las cadenas o entrecruzamiento.…”
ResumenEn este trabajo, polietileno de baja densidad (PEBD) fue modificado en estado fundido con un poliester poliol altamente ramificado maleinizado (HBPAM), usando varias proporciones de peróxido de dicumilo (0.5, 1.0, 1.5 y 2.0 %). El análisis infrarrojo mostró las señales de grupos OH, C=O, -COOR y -C=C-del HBPAM en el espectro de las muestras funcionalizadas (PEBD-g-HBPAM). El grado de injerto (GI) fue entre 9.14 y 9.82 %. El índice de fluidez de las muestras PEBD-g-HBPAM fue más bajo que el del PEBD, y no exhibió una dependencia con el contenido de peróxido de dicumilo y GI. Excepto para la muestra obtenida con un 2.0 % de peróxido de dicumilo, todas las temperaturas de fusión de las muestras de PEBD-g-HBPAM fueron similares a la del PEBD. La entalpia de fusión de las muestras de PEBD-g-HBPAM disminuyó con la concentración de peróxido de dicumilo y GI. El módulo ténsil de estas muestras fue más alto que el del PEBD, pero la elongación a la ruptura fue más baja.
“…Embora o uso de compatibilizantes tenha mostrado eficiência na obtenção de propriedades interessantes nestes sistemas, a abordagem associada ao uso de nanocargas é mais recente e promissora. São relatados melhores resultados na estabilidade térmica, ductibilidade e dureza para blendas de PA6/PP [22] , maior resistência à foto-oxidação para PA6/PEBD [9] e efeitos de reforço por restrição na mobilidade de segmentos de cadeia para PA6/PE-g-MA [10] sempre associados às alterações na morfologia promovidas pela presença das nanocamadas da argila.…”
Section: -Efeito Da Montmorilonita Organifílica Na Compatibilização Eunclassified
“…A nanocarga mais empregada na preparação de nanocompósitos é a argila montmorilonita (MMT) e tem sido utilizada com diversas matrizes poliméricas [1][2][3][4][5][6][7] incluindo-se, mais recentemente as blendas [8][9][10] . Destacase um grande avanço nas pesquisas com blendas e nanoargilas nas instituições brasileiras [11][12][13] demonstrando principalmente o comportamento mecânico e reológico para estes materiais.…”
Resumo: Blendas imiscíveis de poliamida 6 e polietileno de baixa densidade foram preparadas com e sem a presença de polietileno enxertado com anidrido maleico como compatibilizante. Montmorilonita organofílica foi incorporada nas blendas por intercalação do fundido. Análises morfológicas e estruturais apresentaram boa dispersão da argila, com a obtenção de estruturas intercaladas e esfoliadas. A separação de fases foi observada nas amostras, e tanto o compatibilizante como a argila causaram redução no tamanho dos domínios. Esta estrutura proporcionou uma melhora significativa nas propriedades mecânicas das blendas, revelando o efeito de reforço causado pela argila. O módulo elástico e a tensão máxima aumentaram em até 300% e 100%, respectivamente. O efeito da compatibilização da argila foi positivo. Pelas análises de DSC pode-se observar o surgimento de um pico na região de fusão da PA6 atribuído à formação de uma nova fase cristalina devido à presença de argila. Palavras-chave: Nanocompósitos, blendas, montmorilonita, polietileno, poliamida.
The Effect of Organophilic Montmorillonite on Compatibilization, Morphology and Mechanical and Thermal Properties of PA6/ LDPE BlendsAbstract: Immiscible blends of polyamide 6 and low density polyethylene were prepared with and without maleic anhydride grafted polyethylene used as a compatibilizer. Organophilic montmorillonite was incorporated in the blends by melt intercalation. Morphological and structural analysis showed good clay dispersion with partially exfoliated and intercalated structures. Phase separation was observed and domains size reduction was induced by the clay and the compatibilizer. Improvement on mechanical properties of compounds was observed, showing the reinforcing effect caused by the clay. Elastic modulus and tensile strength have increased up to 300% and 100%, respectively. The clay showed a positive effect on compatibilization. DSC analysis revealed a new melting peak for PA6 assigned to a new crystalline phase due the clay effect.
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