Preparation of Recycled Polycarbonate/Acrylonitrile-Butadiene-Styrene Composites
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0895-G05-06.1
Preparation of Recycled Polycarbonate/Acrylonitrile-Butadiene-Styrene Composites Woo-Hyuk Jung1, 2, Nathan Tortorella2, Charles L. Beatty2 and Stephen P. McCarthy1 1 Department of Plastics Engineering, University of Massachusetts Lowell, One University Ave. Lowell, MA 01854 2 Department of Materials Science and Engineering, University of Florida P.O. Box 116400 Gainesville, Florida 32611, USA ABSTRACT The front cover of Motorola cellular phone housings were ground to the same size as original particles prior to use by a knife mill. The mixtures contained 15.2 wt% metals, 1.9 wt% foams, 1.4 wt% rubbers and 81.4 wt% thermoplastics where the major component was a polycarbonate (PC)/acrylonitrile-butadiene-styrene (ABS) blend. The separation of the thermoplastic scraps was performed using the sink-float process in water and salt solution. The impact modification of all housing containing six thermoplastic parts was carried out by the addition of a polyolefin elastomer called as the functionalized polyethylene (PE). Unprinted glass fiber reinforced epoxy circuit boards were size reduced and pulverized using the knife mill and hammer mill. The ground epoxy circuit boards were then classified with a set of testing sieves using Gyro sifter, and their mean diameters were calculated by means of particle size distribution analysis. Izod impact strengths at two temperatures, tensile tests, scanning electron microscopy (SEM) on the fracture surfaces, and dynamic mechanical spectroscopy were performed to characterize the alloys and mixtures compounded by a batch mixer and a twin screw extruder. INTRODUCTION The mass production and consumption of electrical appliances have produced many electrical scraps, which have caused great attention to the recycling for several decades. These electrical wastes came from domestic and industrial electrical appliances, computer products, cell phone housings and so on. The useful plastic wastes were also produced from automobile structural materials such as fascias, bumpers and interiors or exterior ornaments [1]. Especially, PC/ABS alloy materials recovered from these wastes took great attraction due to their excellent mechanical, thermal, and optical properties including good flammability resistance. PC/ABS alloys were characterized of comparatively high impact strength, distortion temperature under load, ignition resistance, UV stability, color stability, flammability rating, and tensile and flexural strength [2]. The high impact strength, distortion temperature and tensile and flexible strength of PC/ABS polyalloys were considered as significant properties for the plastics reclamation. Blending PC/ABS alloys obtained from recycling plastics in electronics and automotive sources often resulted into significant deterioration of impact properties. Functionalized metalocene polyethylene copolymers, especially ethylene-1-octene copolymers [3-4], had been used to alleviate the decrease of the impact strength of the mixtures of the recycled materials. Other impact modifiers that have
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