Jeefferie Abd Razak, Siti Zaleha Wahid, Noraiham Mohamad, Poppy Puspitasari, Rosidah Jaafar, Pindo Tutuko


This study has reported the effects of different formulation ratio between recycled high density polyethylene (r-HDPE) and recycled polypropylene (r-PP) into the resulted mechanical, thermal and morphological properties of r-HDPE/r-PP polymeric blends. About five (5) different formulation ratio of r-HDPE/r-PP have been prepared and tested. The best combination ratio between r-HDPE and r-PP was determined in this work. It was found that the 70/30 wt.% of r-HDPE/r-PP blend possessed an outstanding mechanical and physical strength. About 59.80% and 2.30% of positive improvement in comparison to 0/100 wt.% of r-HDPE/r-PP was achieved for both of tensile strength and hardness, respectively. Interestingly, for 70/30 wt.% of r-HDPE/r-PP blend had also experienced major increased in their elongation at break up to 473%. The fracture morphological behavior of the tested samples that were observed via SEM observation, had established the interaction between the structure and properties of produced r-HDPE/r-PP blends, especially on the miscibility state between the r-HDPE and r-PP phases. Thermal evaluation by using the DSC had confirmed the partial miscibility state due to dominant peak shifting at 120 - 140°C and obvious melting peak reduction pattern. Overall, from this study, it was found that the blending between r-HDPE and r-PP into r-HDPE/r-PP blends are feasible to improve the properties of primary phase.


r-HDPE/r-PP recycled blends; injection molding scrap; sustainable; miscibility

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Verdolotti L, Iucolano F, Capasso I, Lavorgna M, Iannace S, Liguori B. Recycling and recovery of PE‐PP‐PET‐based fiber polymeric wastes as aggregate replacement in lightweight mortar: Evaluation of environmental friendly application. Environmental Progress and Sustainable Energy. 2014;33(4): 1445-1451.

Al-Salem S.M, Lettieri P, Baeyens J. Recycling and recovery routes of plastic solid waste (PSW): A review. Waste Management. 2009;29(10): 2625–2643.

Salih S.E, Hamood A.F, Alsabih A.H. Comparison of the characteristics of LDPE: PP and HDPE: PP polymer blends. Modern Applied Science. 2013;7(3): 33.

Gu L, Ozbakkaloglu T. Use of recycled plastics in concrete: A critical review. Waste Management. 2016;51: 19-42.

Iwata T. Biodegradable and bio-based polymers: Future prospects of eco-friendly plastics. Angewandte Chemie - International Edition. 2015;54(11): 3210–3215.

Singh N, Hui D, Singh R, Ahuja I.P.S, Feo L, Fraternali F. Recycling of plastic solid waste: A state of art review and future applications. Composites Part B: Engineering. 2015;115: 409-422.

Bernardo C.A, Simões C.L, Pinto L.M.C. Environmental and economic life cycle analysis of plastic waste management options. A review. In AIP Conference Proceedings. 2016;1779(1): 140001.

Smith W.F, Hashemi J. Foundations of Materials Science and Engineering. 4th Edition McGraw-Hill Higher Education, New York; 2006.

Tao Y, Pan Y, Zhang Z, Mai K. Non-isothermal crystallization, melting behavior and polymorphism of polypropylene in β-nucleated polypropylene/recycled poly (ethylene terephthalate) blends. European Polymer Journal. 2007;44(4): 1165-1174.

Montes P, Rafiq Y.A, Hill M.J. A study of blends of isotactic polypropylene with high density polyethylene by transmission electron microscopy. Polymer. 1998;39(25): 6669-6672.

Aumnate C, Gamonpilas C, Kruenate J. Effect of ethylene vinyl acetate on the rheological and mechanical behavior of low-density polyethylene-based greenhouse film. Advanced Materials Research. 2010;93: 475-478.

Madi N.K. Thermal and mechanical properties of injection molded recycled high density polyethylene blends with virgin isotactic polypropylene. Materials and Design. 2013;46: 435–441.



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