Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
권호 표지

The Effect of Cyclic Oligomer on the Non-isothermal Crystallization Kinetics of Polyethylene Terephthalate

폴리에틸렌테레프탈레이트의 비등온 결정화 속도론에서 고리올리고머 효과

  • 류동일 (전남대학교 공과대학 섬유공학과) ;
  • 이무성 (전남대학교 공과대학 섬유공학과, 전남대학교 가정대학 의류학과, 전남대학교 공과대학 섬유공학과)
  • Published : 1994.03.01

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Abstract

Various poly(ethylene terephthalate) (PET) samples were prepared from two conventional polycondensation processes using dimethyl terephthalate(DMT) and terephthalic acid(TPA) together with ethylene glycol (EG) in the absence of catalyst. Cyclic oligomeric components in the PET samples as made were extracted by using dissolution/precipitation method. The effect of polymerization conditions and the presence of cyclic oligomer on the crystallization behavior of PET was investigated under dynamic cooling conditions. Non-iso-thermal crystallization processes were carried out by differential scanning calorimetry(DSC) . All the data from DSC were calculated by Ozawa's equation In conclusion, the absence of cyclic oligomer in PET gives lower values of Avrami exponent n. n value does not give any noticeable change with the increase of diethylene glycol(DEG) content. However, PET sample prepared from DMT process showed considerably low n value of 1.0∼0.9.

Keywords

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