Estudo da miscibilidade e das propriedades mecânicas de blendas SAN/NBR
AUTOR(ES)
Francine Ziquinatti
DATA DE PUBLICAÇÃO
2005
RESUMO
Aiming the study of miscibility and mechanical properties, blends of poli(styrene-coacrylonitrile) (SAN) with poli(butadiene-co-acrylonitrile) (NBR) rubbers were prepared by casting, co-precipitation and extrusion followed by injection, varying acrylonitrile (AN) contents from 32,7 to 45% (w/w) in NBR. The blends were prepared in the compositions: SAN/NBR 90/10, 80/20, 70/30, 60/40 and 50/50 (w/w) and valued by Infrared spectroscopy (FTIR), Differential scanning calorimetry (DSC), Scanning electron micrographs (SEM), Tensile and Izod impact tests. FTIR analyses of casting blends displayed that not happened reactions or specific interactions between polymers during blending because did not happened a shift in the spectrum blends bands. The DSC analyses of casting blends showed total imiscibility to SAN/NBR 50/50 blend (AN contents in NBR 32,7%), partial miscibility to the 60/40, 70/30 and 80/20 compositions and total miscibility to the 90/10 composition. The SAN/NBR blends (AN contents in NBR 39%), prepared by casting and coprecipitation revealed partial miscibility for all compositions. Coprecipitated blends prepared with AN rubber content of 45% showed partial miscibility to 50/50, 60/40, 70/30 and 90/10 compositions and total miscibility to 80/20 composition. The phase morphology was influenciated by blending methods, casting blends revealed dispersed spherical elastomeric domains in matrix while coprecipitated blends form co continuous phase. The NBR addition result in significant impact resistant increase but decrease in tensile strenght
ASSUNTO(S)
polímeros polimeros polymers butadieno-co-acrilonitrila poly(butadiene-coacrylonitrile) blendas blends estireno-co-acrilonitrila poly(styrene-co-acrylonitrile) miscibilidade miscibility
ACESSO AO ARTIGO
Documentos Relacionados
- Blendas SAN/NBR: influência do teor de acrilonitrila e da viscosidade da borracha nitrílica nas propriedades mecânicas
- Blendas de SAN/NBR: influência do teor de acrilonitrila da borracha nitrílica nas propriedades físico-química e mecânicas
- Blendas biodegradáveis de poli(3-hidroxibutirato)/poli(e-caprolactona): obtenção e estudo da miscibilidade
- Propriedades mecânicas e térmicas das blendas e nanocompósitos de UHMWPE/LLDPE/CNT para aplicação balística
- Blendas de PMMA e AES : morfologia e propriedades mecanicas