A binary blend (ABS-HIPS 50% wt) was prepared on a twin-screw extruder at 190-210 ºC. The different properties were then analyzed using tensile strength and impact tests, melt flow index (MFI), thermogravimetric analysis (TGA), and

ABSTRACT:Recovery of recycled acrylonitrile-butadiene-styrene (ABS) through mixing with styrene-ethylene/butylene-styrene (SEBS) has been studied in this paper. To simulate recycled ABS, virgin ABS was processed through 5 cycles, at extreme processing temperatures, 220ºC and 260ºC. The virgin ABS, the virgin SEBS, the recycled ABS and the mixtures were mechanically and thermally characterized after the various cycles of reprocessing in order to evaluate their corresponding properties and correlate them with the number of cycles undergone.The results show that tensile strength of ABS remains practically constant as the number of reprocessing cycles increases, while in the material injected with SEBS the tensile strength decreases. Concerning the Charpy notched impact strength, the values of the ABS reprocessed at 220ºC remain more or less unchanged, while the values for 260ºC show a significant decrease. The adhesion of the SEBS causes, in both cases, an increase in impact strength. DSC techniques enabled us to observe how the glass transition temperature (Tg) remains more or less constant regardless of the number of cycles or the temperature, whereas the crosslinking is much greater in the samples reprocessed at 260ºC.As conclusion, it is suggested that the people who works handling and dealing with plastic that, when possible, use low temperatures of transformation of ABS instead of high temperatures. It is also recommended to recycle the ABS to those who work with it; to use 5% of SEBS added to the recycled ABS to recover the possible loss of properties.Keywords: Degradation, Recovery, ABS, SEBS, Injection, Processed, Mechanical characterization, Thermal characterization RESUMEN:En este trabajo se estudia la recuperación de un Acrilonitrilo-ButadienoEstireno (ABS) reciclado mediante mezcla con Estireno-Etileno/ Butadieno-Estireno (SEBS). Para simular el ABS reciclado se ha reprocesado ABS virgen durante cinco ciclos a las dos temperaturas extremas de procesamiento, 220ºC y 260ºC. Los materiales ABS virgen, SEBS virgen, ABS reprocesado y las mezclas han sido caracterizados mecánica y térmicamente para evaluar sus propiedades correspondientes y correlacionarlo con el número de ciclos de proceso.Los resultados muestran que la resistencia a tracción del ABS se mantiene prácticamente constante conforme aumenta el número de ciclos de reprocesado, en cambio, disminuye al aditivarlo con SEBS. Con respecto a la resistencia al impacto, los valores del ABS reprocesado a 220ºC permanecen prácticamente inalterables, mientras que para el reprocesado a 260ºC disminuyen de forma notable. La adhesión de SEBS provoca, en ambos casos, un incremento de energía de impacto. Las técnicas de DSC han permitido observar como la temperatura de transición vítrea se mantiene prácticamente constante independientemente del número de ciclos o de la temperatura; en cambio, el efecto de entrecruzamiento de las moléculas (crosslinking) es mucho mayor para las muestra reprocesadas a 260ºC.Como conclusión, se recomienda a los transformadores de p...

SUMMARYThe importance of recovering waste materials generated by industrialised societies is mainly due to the environmental impact that they have, and one of the principal problems is the presence of end of life tyres. The use of waste microfibre obtained from shredded tyres as reinforcement in polypropylene matrices offers an interesting opportunity for recycling of the waste microfibre, in order to obtain 'value added products' from polypropylene (PP)/waste microfibre tyre composites. The microfibres obtained from shredded tyres were used as a reinforcing material in compositions with polypropylene (PP). The blending proportions were: (1) 10% microfibre 90% PP; (2) 20% microfibre, 80% PP; (3) 30% microfibre, 70% PP; (4) 40% microfibre, 60% PP, (5) 50% microfibre, 50% PP and (6) 80% microfibre, 20% PP. The mechanical and thermal properties were analyzed. In this case polypropylene mixed with polyamide (PA) microfibres show a decrease in tensile strength and elongation at break, however, impact strength and Vicat Softening temperature values increase with polyamide microfibre content. Continuity in the matrix phase was observed by scanning electron microscopy up to loadings of 40% microfibre.

De modo general, la adición del PP ISPLEN ® PB 140 G2M mejora las propiedades mecánicas del PP reciclado, obteniendo en las mezclas valores intermedios a la de los dos componentes, pero sin observar un comportamiento lineal.