Resumo: Misturas PP/EPDM com variadas razões PP:EPDM, não compatibilizadas e compatibilizadas com o polipropileno modificado com anidrido maleico (PP-g-MA), foram preparadas por fusão. A influência da adição de 1 pcr de uma argila bentonita na morfologia, propriedades mecânicas e reológicas destas misturas foi avaliada. A bentonita empregada como carga, proveniente da Bentonit União Nordeste/PB foi purificada e modificada organicamente com tecnologia desenvolvida por nosso grupo de pesquisa, antes de ser adicionada às misturas. Os dados de difratometria de raios X mostraram que, para diferentes razões de PP:EPDM na mistura a incorporação de 1 pcr de argila organofílica resultou na formação de nanocompósitos intercalados desordenados (20 ou 40% de EPDM) ou intercalados/ esfoliados (10 e 30% EPDM). A incorporação da argila organofílica provocou alterações nas propriedades morfológicas, mecânicas e reológicas das misturas, especialmente daquelas preparadas com 30% em massa de EPDM onde a ação compatibilizante da argila foi observada. Palavras-chave: Blendas PP/EPDM, argila organofílica, compatibilização. The Use of an Organoclay on the Compatibilization of PP/EPDM BlendsAbstract: PP/EPDM blends with different PP:EPDM ratios, non-compatibilized and compatibilized with maleic anhydride grafted polypropylene (PP-g-MA) were prepared by melting. The influence of 1 phr bentonite clay addition on the morphology, mechanical and rheological properties of these blends was evaluated. The bentonite used as a filler, provided by Bentonit União Nordeste/PB, was purified and organically modified with a technology developed by our research group, before being added to the blends. X-ray diffraction results showed that, for blends having different PP:EPDM ratios, 1 phr organoclay addition led to the formation of intercalated (20 or 40% EPDM) or intercalated/exfoliated (10 and 30% EPDM) nanocomposites. The morphological, mechanical and rheological properties of the blends were modified by organoclay addition, especially for those with 30 wt% of EPDM, where a compatibilizing effect of the organoclay was observed. Keywords: PP/EPDM blends, organoclay, compatibilization. IntroduçãoO desenvolvimento de misturas (blendas) poliméricas é de grande interesse acadêmico e industrial por ser uma prática relativamente simples de criar materiais com propriedades desejadas [1,2] . A mistura de polipropileno (PP) com elastômeros visa melhorar sua resistência ao impacto (tenacidade) a baixas temperaturas. Vários elastômeros são usados como modificadores de impacto para o PP, incluindo poliisobutileno [3] , copolímero em bloco de estireno-butadieno [4] , poliisopreno [5] e borracha natural [6] , mas os copolímeros de etileno-propileno (EPR) [7] e os terpolímeros de etileno-propileno-dieno (EPDM) [8][9][10][11] têm sido mais eficientes para esta aplicação.Estudos reportados na literatura têm mostrado que a incorporação do EPDM ao PP resulta na obtenção de PP tenacificado, também denominado poliolefina termoplástica (TPO). Contudo, algumas propriedades...
The catalytic cracking of sunflower oil over vermiculite clay was studied in a thermal analysis system, the process being accompanied by thermogravimetry. The vermiculite was chemically modified by acid leaching and characterized by techniques of XRD, FTIR, SEM and TG. The catalytic test was performed in a thermal analysis system with heating up to 900 °C, with proportion oil/clay = 100. The results of thermogravimetry showed that in the presence of the catalyst, the thermograms present a single mass loss. The test was also performed with the molecular sieve Al-MCM-41 with proportion Si/Al = 25 and 75, with similar results to those presented by vermiculite.
In this study, the influence of type and amount of organoclay in the morphology of the polymer blend PP/EPDM is evaluated. Pure and filled mixtures were prepared by melt intercalation in an internal mixer. The morphology of the hybrids was evaluated by X-ray diffraction and scanning electron microscopy. The results showed that the incorporation of the organophyllic clay to the PP/EPDM blend resulted in new interfacial interactions between components, which contributed to a decrease in the size of the dispersed phase and the compatibility of the blends. Therefore, organoclays may be employed to compatibilize polymeric blends, replacing conventional compatibilizers.
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