UV Degradation Properties of Stationery Commodities Manufactured from Recycled Polypropylene

One of the unsolved problems on recycling of waste plastic is the viscosity non-uniformity; the viscosity of recycling plastics is neither stable nor homogeneous as the material is a mixture of pieces of various products with different molecular weights. In this study, we propose a processing system of recycling plastics, the so-called continuous viscosity homogenization treatment system. In this system, we maintain the viscosity by blending virgin resins to waste plastics with monitoring the viscosity via an in-line rheometer. Tsenoglou's equation was used in the homogenization treatment. We evaluated the concept for mixtures of aqueous solutions of poly (ethylene oxide) which is one of the entanglement polymers. The viscosity after the homogenization treatment was in good agreement with the target viscosity.

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Effect of Addition of Styrene-Ethylene/Butylene-Styrene and the Type of Mica on the Mechanical Properties of Mica-Filled Polyethylene/Polypropylene Blends

Kajiyama

Yasuda

Yamanaka

et al. 2018

International Polymer Processing

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The mechanical properties of polyethylene (PE)/polypropylene (PP)/styrene-ethylene/butylene-styrene (SEBS)/mica composites were investigated as a model composition. Four types of mica with different particle sizes and different aspect ratios were used. These composites were extruded by a twin-screw extruder and subsequently injection molded, and their mechanical properties, including their tensile, bending, and impact properties were evaluated. The addition of mica to PE/PP/SEBS effectively improved its mechanical properties; the addition of SEBS as a compatibilizer likewise enhanced the mechanical properties compared with those of PE/PP composites without SEBS. The use of larger average particle size and higher aspect ratio mica, such as M-35, M-27, and P-33, effectively increased the tensile and bending properties of the PE/PP/SEBS/mica composites. The morphologies of the composites with an added mica as observed by scanning electron microscopy, showed good dispersion between the matrix polymer and the mica.

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UV Degradation Properties of Stationery Commodities Manufactured from Recycled Polypropylene

Cited by 3 publications

References 19 publications

Polymer-Recycling of Bulk Plastics

Polymer-Recycling of Bulk Plastics

Viscosity Homogenization Treatment of Waste Plastic Recycling, Development of Process and Control Methods

Effect of Addition of Styrene-Ethylene/Butylene-Styrene and the Type of Mica on the Mechanical Properties of Mica-Filled Polyethylene/Polypropylene Blends

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