title: Investigation of thermodynamic parameters in the thermal decomposition of plastic waste-waste lube oil compounds.
abstract: Thermal decomposition properties of plastic waste-waste lube oil compounds were investigated under nonisothermal conditions. Polyethylene (PE), polypropylene (PP), polystyrene (PS), and polyethylene terephthalate (PET) were selected as representative household plastic wastes. A plastic waste mixture (PWM) and waste lube oil (WLO) were mixed with mixing ratios of 33, 50, and 67 (w/w) % on a PWM weight basis, and thermogravimetric (TG) experiments were performed from 25 to 600 degrees C. The Flynn-Wall method and the Ozawa-Flynn-Wall method were used for analyses of thermodynamic parameters. In this study, activation energies of PWM/WLO compounds ranged from 73.4 to 229.6 kJ/mol between 0.2 and 0.8 of normalized mass conversions, and the 50% PWM/WLO compound had lower activation energies and enthalpies among the PWM/WLO samples at each mass conversion. At the point of maximum differential mass conversion, the analyzed activation energies, enthalpies, entropies, and Gibbs free energies indicated that mixing PWM and WLO has advantages in reducing energy to decrease the degree of disorder. However, no difference in overall energy that would require overcoming both thermal decomposition reactions and degree of disorder was observed among PWM/WLO compounds under these experimental conditions.
authors.affiliation: School of Civil Engineering, Purdue University, West Lafayette, Indiana 47907, USA. kim272@purdue.edu
authors.forename: Yong Sang
authors.initials: YS
authors.lastname: Kim
authors.forename: Young Seok
authors.initials: YS
authors.lastname: Kim
authors.forename: Sung Hyun
authors.initials: SH
authors.lastname: Kim
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000032:analysis*; D001272:Atmosphere; D003247:Conservation of Natural Resources; D004784:Environmental Monitoring / Q000379:methods; D004787:Environmental Pollution / Q000032:analysis; D004867:Equipment Design; D006358:Hot Temperature; D010578:Petroleum; D010969:Plastics / Q000737:chemistry*; D020959:Polyethylene / Q000737:chemistry; D011126:Polypropylenes / Q000737:chemistry; D011137:Polystyrenes / Q000737:chemistry; D013816:Thermodynamics; D055549:Volatile Organic Compounds / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D010578:Petroleum; D010969:Plastics; D011126:Polypropylenes; D011137:Polystyrenes; D055549:Volatile Organic Compounds; D020959:Polyethylene