• 한국염색가공학회지
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• 제2권3호
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• pp.8-13
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• 1990

In order to study the modification of wettability, tactility, and bathochromicity of the poly (ethylene Terephthalate) (PET) fabrics, low-temperature plasma$(O_2)$ has been irradiated on the PET fabrics in various conditions. The results obtained from this study were as follows; 1) The weight loss rate of plasma-treated PET fabrics is proportional to irradiation time and internal gas temperature of treating chamber. Also, the effect of weight loss is remarkable at gas pressure ranging from 3 torr to 5 torr. 2) The bathochromic effect of PET fabrics treated with low-temperature plasma$(O_2)$ was improved.

• 폴리머
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• 제37권3호
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• pp.316-322
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• 2013

본 연구에서는 고분자 소재 중 하나인 폴리(에틸렌 테레프탈레이트)(poly(ethylene terephthalate), PET) 필름의 표면을 친수성으로 개질하기 위하여 기상 불소화 및 초음파 수세를 실시하였다. 표면 처리된 PET 필름의 표면 특성은 접촉각, 표면 자유에너지, 주사전자 현미경(FE-SEM), 원자간력 현미경(AFM), X선 광전자분석법(XPS)을 통하여 분석하였다. 직접 불소화 및 초음파 수세 처리된 PET 필름의 물 접촉각은 $10.8^{\circ}$으로 미처리된 PET에 비하여 85% 감소하였고, 총 표면 자유에너지는 $42.25mNm^{-1}$으로 미처리된 PET에 비하여 650% 증가하였다. 또한 RMS(root mean square) 거칠기는 1.965 nm로 미처리된 PET 필름에 비하여 348% 증가하였으며, 친수성 관능기인 C-OH 결합의 농도는 약 3배 가까이 증가하였다. 이는 직접 불소화 및 초음파 수세 처리된 PET 필름 표면에 형성된 친수성 관능기와 공동화 현상에 의한 화학적 식각 반응에서 기인한 것으로 생각된다. 이 결과로부터, 기상 불소화 및 초음파 수세 처리법은 PET 필름 표면을 친수성으로 쉽게 개질할 수 있는 효과적인 방법으로 기대된다.

• 청정기술
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• 제13권4호
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• pp.244-250
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• 2007

초임계이산화탄소 분위기 하에서 C. I. Disperse Yellow 54 분산염료의 수착량을 압력, 온도 및 시간에 따라 측정하여 고분자 섬유인 PTT (poly(trimethylene terephthalate))와 PET (poly(ethylene terephthalate)) 내에서의 염료의 확산속도를 계산하였다. 고분자 섬유 내에서의 염료의 확산계수(diffusivity)는 $10^{-12}\;cm^2/sec$의 매우 작은 값을 가지며, 일정 압력에서 온도가 증가함에 따라, 그리고 일정 온도에서 압력이 증가함에 따라 그 값이 증가하였다. 또한 PTT 내에서의 확산계수는 PET 내에서의 확산계수의 $1.5{\sim}3$ 배 정도로 더 높았다. 섬유가 매우 가늘므로 섬유 내에서의 농도는 거의 균일하였다.

• 한국염색가공학회지
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• 제24권1호
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• pp.33-38
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• 2012

In this study, to increase flame retardation of poly(ethylene terephthalate) (PET) in burning, bisphenol A bis(diphenyl phosphate) (BDP), a well known flame retardant containing phosphorous, was reacted on end groups of PET by radical pathway. End-capping mechanism of PET with BDP was suggested and confirmed by spectroscopic and thermal analysis. From 400 MHz $^{31}P$ solid state FT-NMR spectrum of end-capped PET (PET-BDP), phosphorus spectra peak in BDP was found at ca. -20 ppm. Furthermore, P-C bond stretching vibration peaks were found ca. $600cm^{-1}$ in FT-IR spectrums of PET-BDP. These results showed that BDP can be chemically added on end groups of PET by our method. Thermal characteristics of pure PET (pPET) and PET-BDP were measured and evaluated by TGA analysis. There was not significant changes in thermal characteristics of PET-BDP compared to that of pPET.

• 한국염색가공학회지
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• 제24권1호
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• pp.39-44
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• 2012

To improve flame retardation of poly(ethylene terephthalate) (PET) against burning, resorcinol bis(diphenyl phosphate) (RDP), phosphorous containing flame retardant, was incorporated into PET backbone by radical reaction pathway. Radical endcapping of PET with RDP was confirmed by spectroscopic and thermal analysis. From 400 MHz $^{31}P$ solid state FT-NMR spectrum of PET with RDP (PET-RDP), phosphorus spectra peak in RDP was found at ca. -10 ppm. Furthermore, P-C bond stretching vibration peaks were found ca. $530cm^{-1}$ in FT-IR spectrums of PET-RDP. These results indicated that RDP can be chemically bound at the ends of PET by radical addition method. Thermal characteristics of pure PET (pPET) and PET-RDP were measured and evaluated by TGA thermal analysis. There was not significant changes in thermal characteristics of PET-RDP compared to that of pPET.

• 한국염색가공학회지
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• 제2권4호
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• pp.231-236
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• 1990

The diffusion coefficient of C.I. Disperse Red 4 in the dyeing of carrier-pretreated poly (ethylene terephthalate) film was Investigated by Sekido's film-rolled method. From the result it was shown that the diffusion coefficient increases exponentially with the content-ration of carrier in the film, and, for the films containing same concentration of carrier, the carrier effect was enhanced with the molar volume of the carriers. The greater carrier effect was accompanied by the decrease in diffusion activation energy and entropy, which shows that the carrier with larger molar volume plasticizes PET film to more extent.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 봄 학술발표회 논문집
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• pp.68-71
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• 2003

Poly(trimethylene terephthalate)는 1941년 Caligo printing Ink 사의 Whinfield와 Dickson에 의해 PET와 함께 처음으로 그 중합방법이 보고 된 이래, 주원료인 1,3-propanediol의 생산가격이 너무 높아 지난 60년간 상업화 및 학문적 연구가 거의 이루어져 있지 않다. 미국의 Shell사와 독일의 Degussa(미국의 Dupont)에 의해 1,3-propanediol이 대량 생산되면서[1], PTT 섬유의 상업적 생산에 점점 관심이 집중되고 있다. 국내에서도 S사와 Shell의 공동연구에 의해 제품이 생산되는 둥 많은 연구가 진행중에 있기는 하지만, Poly(ethylene terephthalate)의 연구에 비한다면 아직 걸음마 단계의 기초 자료로 제품이 생산되고 있는 실정이다. (중략)

• Fibers and Polymers
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• 제2권3호
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• pp.129-134
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• 2001

Liquid crystalline (LC) poly(ethylene terephthalate-co-2(3)-chloro-1,4-phenylene terephthalate) (50/50, mole/mole) [PECPT] was synthesized and blended with polycarbonate (PC). LC properties of PECPT and thermal, morphological, and rheological behaviors of the PECPT/PC blend were studied. PECPT showed the nematic LC phase and much longer relaxation time than poly(ethylene terephthalate) (PET). The apparent melt viscosity of PECPT was one third of that of FET. An abrupt torque change was observed during the blending process due to the orientation of LC domains. For the blends containing 10~30 wt% of PECPT, the complex viscosities were higher than that of PC. As PECPT content increases above 40 wt%, shear thinning was observed. The lowest complex viscosity was obtained at 40~50 wt%. Transesterification of PECPT and PC was confirmed by the selective chemical degradation of carbonate groups in PC.

• Journal of Electrochemical Science and Technology
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• 제2권1호
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• pp.51-56
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• 2011

We develop a new nonwoven composite separator for a safer lithium-ion battery, which is based on coating of silica ($SiO_2$) colloidal particles/styrene-butadiene rubber (SBR) binder to a poly(ethylene terephthalate) (PET) nonwoven support. The $SiO_2$ particles are interconnected by the SBR binder and closely packed in the nonwoven composite separator, which thus allows for the development of unusual porous structure, i.e. highly-connected interstitial voids formed between the $SiO_2$ particles. The PET nonwoven serves as a mechanical support that contributes to suppressing thermal shrinkage of the nonwoven composite separator. The $SiO_2$/SBR content in the nonwoven composite separators plays an important role in determining their separator properties. Porous structure, air permeability, and electrolyte wettability of the nonwoven composite separators, in comparison to a commercialized polyethylene (PE) separator, are elucidated as a function of the $SiO_2$/SBR content. Based on this understanding of the nonwoven composite separators, the effect of $SiO_2$/SBR content on the electrochemical performances such as self-discharge, discharge capacity, and discharge C-rate capability of cells assembled with the nonwoven composite separators is investigated.

• 대한화학회지
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• 제31권6호
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• pp.582-589
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• 1987

SIAS unit로 개질된 PET의 열적 성질을 조사한 결과, SIAS unit의 함량이 증가함에 따라 $T_g$는 증가, $T_m$은 감소하는 경향을 보였으며 결정화속도는 크게 감소함을 관찰할 수 있었다. 결정화속도의 감소는 극성과 크기가 큰 술폰산 나트륨기가 쇄의 유연성을 크게 감소시켜 결정표면으로 확산 이동한 고분자 쇄가 결정형태로 재배치 하는 것을 방해하는 것이 중요한 원인으로 생각되며, 결정성장기구는 SIAS unit의 함량에 의해 크게 좌우되어 SIAS unit의 함량이 증가할 수록 3차원 공간으로의 결정 성장이 제한 받음을 관찰 할 수 있다.