Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Changes in the Thermal Properties of PTT/PET Melt Blends with Melting Time

용융 시간에 따른 PTT/PET 용융 블렌드의 열적 특성 변화

  • Kim Young Ho (Department of Textile Engineering, Soongsil University) ;
  • Pang Kyeong (Department of Textile Engineering, Soongsil University)
  • 김영호 (숭실대학교 공과대학 섬유공학과) ;
  • 방경 (숭실대학교 공과대학 섬유공학과)
  • Published : 2004.12.01
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Abstract

Melt blends of poly(trimethylene terephthalate) (PTT) and poly(ethylene terephthalate) (PET) of various ratios were prepared by mixing at $280^{\circ}C$ for different times using twin screw type internal mixer, and their thermal properties were investigated by DSC, DMA and NMR spectroscopy. With increase in mixing time at $280^{\circ}C$, the two melting peaks of PTT/PET blends, corresponding to the melting of PTT and PET, merged to one peak and moved to lower temperatures, while the crystallization temperature moved to higher temperatures. DMA analysis indicated a single glass transition temperature for the PTT/PET melt blends of various compositions prepared by mixing at $280^{\circ}C$ for 5 minutes, indicating that the blends are completely miscible in the amorphous region. The transesterification reaction in the PTT/PET melt blends was confirmed bi NMR spectroscopic analysis. Degree of randomness and sequence length of the blends were calculated by using $^13C-NMR$ data. The former increased while the latter decreased as the melt mixing time increased.

Keywords

References

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