Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Mechanical Properties and Thermal Stability of Waste PVC/HDPE Blend Prepared by Twin-screw Extruder

  • Lee, Rami (School of Science and Engineering of Chemical Materials, Kumoh National Institute of Technology) ;
  • Park, Se-Ho (School of Science and Engineering of Chemical Materials, Kumoh National Institute of Technology) ;
  • Baek, Jong-sung (School of Science and Engineering of Chemical Materials, Kumoh National Institute of Technology) ;
  • Kye, Hyoungsan (Department of Advanced Chemical Engineering, Mokwon University) ;
  • Jhee, Kwang-Hwan (School of Science and Engineering of Chemical Materials, Kumoh National Institute of Technology) ;
  • Bang, Daesuk (School of Science and Engineering of Chemical Materials, Kumoh National Institute of Technology)
  • Received : 2018.12.14
  • Accepted : 2018.12.21
  • Published : 2019.03.31
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Abstract

Recycling of waste polyvinyl chloride plastics has attracted much attention due to environmental problems, but the poor mechanical properties, low thermal stability, frequent breakage of strands, and melt cracking of the waste plastics have limited their widespread use. To overcome these disadvantages of waste PVC (W-PVC), recycled PVC powder blend was prepared by adding high-density polyethylene (HDPE) and ethylene vinyl acetate (EVA) as a heat stabilizer and compatibilizer, respectively. An intermeshing co-rotating twin screw extruder was used to prepare the blend, and the characteristics of the blend were analyzed by SEM and TGA, and by using a UTM and Izod impact tester. The impact strength was improved as the EVA content increased for the W-PVC/HDPE (80/20 wt%) blend. As the HDPE and EVA contents increased in the W-PVC/HDPE/EVA blend, the impact strength increased. SEM observations also revealed the improved interfacial adhesion for the EVA-containing blend.

Keywords

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Figure 1. FE-SEM data of waste-PVC containing Ca-Zn heat stabilizer and different amounts of HDPE; (a) waste-PVC containing 1 phr of Ca-Zn heat stabilizer (X500 magnification), (b) waste-PVC containing 1 phr of Ca-Zn heat stabilizer (X10,000 magnification), (c) waste-PVC/HDPE (30/70 wt%) with 1 phr EVA, (d) with 10 phr EVA, (e) waste-PVC/HDPE (50/50 wt%) with 1 phr EVA, (f) with 10 phr EVA, (g) waste-PVC/HDPE (80/20 wt%) with 1 phr EVA, and (h) with 10 phr EVA.

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Figure 2. Mechanical properties of waste-PVC containing different amounts of Ca-Zn stabilizer contents; (a) tensile modulus, (b) tensile strength, (c) elongation, and (d) impact strength.

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Figure 3. Mechanical properties of waste-PVC containing different amounts of HDPE and EVA; (a) tensile modulus, (b) tensile strength, (c) elongation, and (d) impact strength.

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Figure 4. Thermogravimetric analysis of waste-PVC containing different amounts of HDPE and EVA; (a) waste-PVC/HDPE (30/ 70 wt%) with EVA (1, 10 phr), (b) waste-PVC/HDPE (50/50 wt%) with EVA (1, 10 phr), and (c) waste-PVC/HDPE (80/20 wt%) with EVA (1, 10 phr).

Table 1. Formulations of Waste-PVC/High Density Polyethylene/Ethylene Vinyl Acetate Copolymer Blend

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Table 2. Conditions of Extrusion Process

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Table 3. Conditions of Injection Process

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Table 4. Thermogravimetric Analysis of Different Waste-PVC/High Density Polyethylene/Ethylene Vinyl Acetate Copolymer Blend

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