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Research Papers

Mechanical Recycling of Low-Density Polyethylene/Carbon Nanotube Composites and Its Effect on Material Properties

[+] Author and Article Information
Felicia Stan

Mem. ASME
Center of Excellence Polymer Processing,
Dunarea de Jos University of Galati,
47 Domneasca,
800 008 Galati, Romania
e-mail: felicia.stan@ugal.ro

Nicoleta-Violeta Stanciu

Center of Excellence Polymer Processing,
Dunarea de Jos University of Galati,
47 Domneasca,
800 008 Galati, Romania
e-mail: nicoleta.stanciu@ugal.ro

Catalin Fetecau

Mem. ASME
Center of Excellence Polymer Processing,
Dunarea de Jos University of Galati,
47 Domneasca,
800 008 Galati, Romania
e-mail: catalin.feteca@ugal.ro

Ionut-Laurentiu Sandu

Center of Excellence Polymer Processing,
Dunarea de Jos University of Galati,
47 Domneasca,
800 008 Galati, Romania
e-mail: laurentiu.sandu@ugal.ro

1Corresponding author.

Manuscript received May 7, 2019; final manuscript received May 23, 2019; published online July 22, 2019. Assoc. Editor: Y. Lawrence Yao.

J. Manuf. Sci. Eng 141(9), 091004 (Jul 22, 2019) (7 pages) Paper No: MANU-19-1276; doi: 10.1115/1.4044101 History: Received May 07, 2019; Accepted May 23, 2019

In this paper, the impact of recycling and remanufacturing on the behavior of low-density polyethylene/multi-walled carbon nanotube (LDPE/MWCNT) composites is investigated. LDPE/MWCNT composites with 0.1–5 wt%, previously manufactured by injection molding, were mechanically recycled and remanufactured by injection molding and 3D filament extrusion, and the rheological, electrical, and mechanical properties were analyzed and compared with those of virgin composites under the same conditions. Experimental results demonstrate that the recycled LDPE/MWCNT composites have similar rheological, electrical, and mechanical properties as that of virgin composites, if not better. Therefore, the recycled LDPE/MWCNT composites have a great potential for being used in engineering applications, while reducing the environmental impact.

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Figures

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Fig. 1

Flow curves for (a) virgin and (b) recycled LDPE/MWCNT composites at 130 °C

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Fig. 2

Effect of temperature and shear rate on the shear viscosity of (a) virgin and (b) recycled LDPE/MWCNT composites with 5 wt%

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Fig. 3

Master curves for (a) virgin and (b) recycled LDPE/ MWCNT composites at 130 °C

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Fig. 4

Variation of filament diameter for (a) virgin and (b) recycled LDPE/MWCNT composites with 0.1 wt%

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Fig. 5

Effect of MWCNT wt% on the stress–strain curves of (a) virgin and (b) recycled LDPE/MWCNT composites

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Fig. 6

Effect of the recycling process on the stress–strain curves of LDPE/MWCNT composites

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Fig. 7

Variation of (a) Young modulus, (b) tensile strength, and (c) strain at break of LDPE/MWCNT composites

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Fig. 8

Stress–strain curves of LDPE/MWCNT filaments

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Fig. 9

Electrical conductivity of LDPE/MWCNT injection-molded samples

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