Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Crystallization Behavior of PET Modified by Pentanediol units

Pentanediol unit로 개질된 PET의 결정화 거동

  • Lee, Sun-Hui (Dept. of Chemical Engineering, Seoul City University) ;
  • Sim, Mi-Ja (Dept. of Chemical Engineering, Seoul City University) ;
  • Kim, Sang-Wook (Dept. of Chemical Engineering, Seoul City University)
  • 이선희 (서울시립대학교 화학공학과) ;
  • 심미자 (서울시립대학교 화학공학과) ;
  • 김상욱 (서울시립대학교 화학공학과)
  • Published : 1992.04.01
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Abstract

Polyethylene terephthalate(PET) is a well known commercial polymer widely available as fibre and as a major polymer with diverse applications. In this experiment, for the modification of PET, the pentanediol isomers, 1,5-pentanediol(1,5-PD) and neopentyl glycol(NPG), were introduced as third monomers. Crystallization rate decreased by the added NPG of PET modified by NPG units. In the case of PET modified by 1,5-PD, crystallization rate had been slightly increased at all temperatures until the 1,5-PD was added about 10 mol%. The decreased crystallization rate is thought to be due to branched from methyl group of neopentyl, which greatly retards the crystallization by growing onto the crystal surface of the diffused polymer chain.

PET(polyethylene terephthalate)는 섬유 및 다방면의 응용분야에 사용되는 상업용 고분자로 알려져 있다. 본 논문에서는 PET를 개질하기 위해 pentanediol의 이성질체인 1,5-pentanediol(1, 5-PD)과 neopentyl glycol(NPG)를 제3 monomer로 도입시켰다. NPG를 도입시킨 경우에는 결정화 속도가 감소하고, 1,5-PD로 개질된 PET는 1,5-PD가 약 10mo1% 첨가될 때가지 결정화 속도가 서서히 증가하였다. 이러한 결과는 NPG의 branch된 methyl기가 고분자 사슬에 표면으로 확산되면서 결정화하는 것을 방해하기 때문이다.

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