Thermo-Degradation Kinetics of Polyethylene

폴리에틸렌의 열분해 Kinetics

  • Cha, Wang Seog (Department of Environmental Engineering, Kunsan National University)
  • 차왕석 (군산대학교 환경공학과)
  • Received : 1998.12.28
  • Accepted : 1999.02.13
  • Published : 1999.05.10

Abstract

Pyrolysis of polyethylene was carried out in the stainless steel reactor of internal volume of $10cm^3$. Pyrolysis reactions were performed at temperature $390{\sim}450^{\circ}C$ and the pyrolysis products were collected separately as reaction products and gas products. The molecular weight distributions(MWDs) of each product were determined by HPLC-GPC and GC analysis. Distribution balance equation for MWDs of random and specific products were proposed to account for initiation-termination and propagation-depropagation, such as hydrogen abstraction, chain cleavage, coupling of polymer and radical. A separate chain-end scission process produces low molecular weight noncondensable gases(C1 through C5) of average molecular weight 38. Activation energies of the random-chain scission and chain-end scission rate parameters, respectively, were determined to be 35, 17 kcal/mole.

Keywords

Polyethylene Pyrolysis;MWD;Distribution Balance Equation;Random-chain Scission;Chain-end Scission

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