Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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A Study on the Change of Optical and Mechanical Properties by Reprocessing for High Melt-Indexed Polycarbonate Used in Injection Molded Optical Parts

광학용 사출성형품에 사용되는 고유동성 폴리카보네이트의 재사용에 따른 광학적, 기계적 물성 변화에 대한 연구

  • 이준한 (단국대학교 기계공학과) ;
  • 강정진 (한국생산기술연구원 금형기술그룹) ;
  • 윤경환 (단국대학교 기계공학과) ;
  • 김종선 (한국생산기술연구원 금형기술그룹)
  • Received : 2018.04.06
  • Accepted : 2018.07.17
  • Published : 2018.08.01
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Abstract

To estimate the recycling feasibility of high melt-indexed polycarbonate, 3.5 inch LGP, tensile, flexural and impact specimens were injection-molded and the LGP was shredded into scraps. The scraps were injection-molded again and this process was repeated for 4 times. Properties of the sample, i.e., optical properties, mechanical properties and number average molecular weight were measured at each cycle. Based on the results, as the number of reprocessing increased, transmittance decreased at low wavelength and color coordinate was changed systematically to yellow. Yellow index increased more than twofold during 4 recycling processes. On the other hand, the number average molecular weight decreased during recycling processes. Flexural and impact strength showed no tendency according to the number of recycling, but tensile strength decreased sharply after the third recycling process. Based on these properties, it was concluded that the number of recycling for high melt-indexed polycarbonate allowed in this study was one.

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References

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