Kinetics of Solid State Polycondensation of PET by Mathematical Modeling

폐 PET를 이용한 고상중합시 Modeling에 의한 속도론적 고찰

  • 유영식 (한양대학교 공과대학 섬유공학과) ;
  • 박준욱 (한양대학교 공과대학 섬유공학과) ;
  • 송석규 (한양대학교 공과대학 섬유공학과)
  • Published : 1999.02.01

Abstract

The kinetics of solid-state-polymerization of waste PET was studied by modeling the diffusion kinetics of EG. For simplicity in modeling, the equation of diffusion was assumed to be independent of crystallization rate. Plain sheet and sphere models were evaluated to find suitable model representing the shape of waste PET particle. For each model, the diffusivities of EG at 17$0^{\circ}C$, 19$0^{\circ}C$ and 23$0^{\circ}C$ were calculated. The activation energy of plain sheet type for the diffusivities of EG was 22.97 kcal/mol and that of sphere type was 26.17 kcal/mol. While the kinetics of each model at 17$0^{\circ}C$ and 19$0^{\circ}C$ showed no difference, sphere model showed a better agreement with experimental data at 23$0^{\circ}C$, probably due to the increase in the diffusivity of EG with temperature. A deviation was observed between the derived equation and experimental data at 23$0^{\circ}C$, probably due to the oversimplification of the derived equation by ignoring the steady-change of crystallinity during the polymerization.

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