• Maryudi Maryudi Department of Chemical Engineering, Universitas Ahmad Dahlan, Jl Prof Supomo, Janturan, Umbulharjo, Yogyakarta 55164, Indonesia
  • Nugroho Dewayanto Section of Chemical Engineering Technology, Universiti Kuala Lumpur, Malaysian Institute of Chemical and Bioengineering Technology, 1988 Vendor City, Taboh Naning, 78000 Alor Gajah, Melaka, Malaysia
  • Mohammad Dalour Hossen Beg Faculty of Chemical and Natural Resources Engineering, Universiti Malaysia Pahang, Lebuh Raya Tun Razak 26300 Gambang, Kuantan, Pahang, Malaysia
  • Rosli Mohd Yunus Faculty of Chemical and Natural Resources Engineering, Universiti Malaysia Pahang, Lebuh Raya Tun Razak 26300 Gambang, Kuantan, Pahang, Malaysia



HDPE degradation, natural weathering, manganese laurate, manganese palmitate, manganese stearate


High density polyethylene (HDPE) degradation has been studied. In this study, HDPE was incorporated with manganese laurate, manganese palmitate and manganese stearate as pro-oxidant additives. Preparation of samples were conducted by adding the HDPE resin with pro-oxidant additives in the range of 0-1.0 wt %. A twin screw extruder was employed prior to the injection molding technique. Samples were subjected to natural weathering for the maximum duration of 24 weeks. Assessments on the change of the properties of samples after natural weathering treatment were conducted by FTIR analysis, tensile testing and average molecular weight analysis. In term of their capabilities to accelerate degradation of HDPE, manganese stearate exhibited more influence than manganese laurate and manganese palmitate. The carbonyl group’s peak arises as a result of oxidation during the treatment as revealed by FTIR traces. Samples with pro-oxidant additives shows a loss of their strain at break. The amount of pro-oxidant additives increases the degradation of samples.


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