• Proceedings of the Korean Fiber Society Conference
• /
• 1986.06a
• /
• pp.44-45
• /
• 1986

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 1988.05a
• /
• pp.63-66
• /
• 1988

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.35 no.1
• /
• pp.15-20
• /
• 2002

Quality variation of plastic pouch packing of Changran-Jeotgal produced by improved process and conventional process were investigated during storage at 10, 20 and $30^{\circ}C$, respectively. The kind of plastic pouch used in this study were polyethylene/nylon/linear low density polyethylene (PE/Ny), polyethylene terephthalatefpolyethyleneflinear low density polyethylene (PET) and low density polyethylene (PE). In the higher storage temperature, the faster increase of$ CO_2$, concentration and volume of pouch packing in all kinds of pouch. However, the highest value of pH, L-value, volatile basic nitrogen (VBN) and viable cell counts were shown in PE, the next was PET and PE/Ny, Overall, Changran-Jeotgal produced by improved process showed a little change of physical and chemical characteristics than conventional process. From above results, relationship between quality parameters were predicted pH, L-value, VBN and sensory score were highly correlated, therefore, these parameters is expected to uses as shelf-life indicated elements in cease of plastic pouch packaging.

• Textile Coloration and Finishing
• /
• v.16 no.1
• /
• pp.59-64
• /
• 2004

As a simulation of solvent-assisted dyeing, the solvent effects on the structure of polyethylene terephthalate(PET) film treated by dimethylformamide(DMF) were investigated. The effects were evaluated by the atomic force microscopy(AFM) topographical changes and FT-IR spectrum analysis. PET films treated with DMF at $70^{\circ}C$ for several different treatment time(20, 40, and 60 min). AFM topography showed that, with increasing treatment time by DMF, PET surfaces became smooth due to the swelling phenomenon and the rigid structure changed into flexible state which was contributed to increase the surface area of PET films. FT-IR spectrum analysis showed that DMF and molecular chains of PET interacted each other via their polar carbonyl groups and that DMF also affected the out-of-plane bending vibration mode of phenyl ring of PET.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.29 no.12 s.148
• /
• pp.1546-1553
• /
• 2005

The wetting behavior and liquid transport of nonionic surfactant solutions; Span 20 and Tween 20, 40, 60, 80, 21, 61, 81, 65 & 85: in polyethylene terephthalate(PET) fabrics are reported. Five different PET fabrics are used in this study. PET 1, 2 & 3 have different compactness in structure. PET 4 & 5 have similar physical properties to PET 2, however, PET 4 has heat set finish and PET 5 with rewetting agent. The wetting and water retention properties of PET fabrics are greatly improved by addition of nonionic surfactants. The aqueous liquid retention(W) vs. cosq and W vs. adhesion tension has positive linear relationship. Hydrophilic surfactants which have short hydrophobes and surfactants with unsaturated hydrophobe structures are more efffctive in improving the wetting properties of PET fabrics. PET fabric which has larger thread spacing shows greater value of water retention ratio(W/H) than PET fabric with smaller thread spacing if there are no surfactants present in the system, however, W/H values become very similar among these PET fabrics when the surfactants are added. If there are no surfactants present in the system, PET with heat set finish has smaller value and PET with rewetting agent has greater value of W/H than PET without finish even though the fabrics have the similar physical properties.

• Proceedings of the Korean Institute of Industrial Safety Conference
• /
• 2003.10a
• /
• pp.176-179
• /
• 2003

범용 엔지니어링 플라스틱(Engineering plastic)인 PET(Polyethylene terephthalate)수지는 투명성, 강도특성, 내열특성, 기체차단성 등 물성이 우수하여 합성섬유, 이축연신 film, 식음료용 bottle 등의 용도로 널리 사용되는 적용범위가 매우 넓은 고분자 소재이다. 그러나 폐기된 PET 수지를 물질재활용(material recycling) 방법으로 재가공할 경우 수지 자체가 갖는 가수분해(hydrolysis)와 열분해(thermal degradation) 특성으로 인해 가공성 및 기계적 특성이 현저히 저하되는 단점이 있다.(중략)

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.38 no.8
• /
• pp.701-707
• /
• 2014

The ecofriendly yellow ocher is used in the manufacturing of cosmetics, construction, and food packaging. The polyethylene terephthalate (PET) used for manufacturing food containers has a microporous structure that causes aeration. Hydrophilic yellow ocher may be applied to hydrophobic PET by surface modification to overcome this issue. The aim of this study is to fabricate a yellow ocher polystyrene hybrid structure in the form of nanoparticles using an optimizing molar ratio of styrene, divinylbenzene, and potassium peroxodisulfate for use in emulsion polymerization. The polymerization was conducted in a yellow ocher suspension that was prepared by dispersing mechanically ground yellow ocher in DI water. The prepared hybrid structure was measured using scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. The measurement revealed the spherical morphology and Si component that resulted from the yellow ocher in the polystyrene particles. We expect that this hybrid structure would be used as platform material to minimize aeration in PET.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2013.08a
• /
• pp.282-282
• /
• 2013

그래핀(Graphene)은 열 전도도가 높고 전자 이동도(200 000 cm2V-1s-1)가 우수한 전기적 특성을 가지고 있어 차세대 전자재료로써 유망한 후보로 간주되어 왔다. 최근에는 아크 방출(Arc discharge method), 화학적 기상 증착법(Chemical vapor deposition; CVD), 이온-조사법(Ion-irradiation) 등을 이용한 이종원자(Hetero atom)도핑과 화학적 처리를 이용한 기능화(Functionalization)등의 방법으로 그래핀의 전도도를 향상시킬 수 있었다. 그러나 이러한 방법들은 기판의 표면을 거칠게 하며, 그래핀에 많은 결함들이 발생한다는 단점이 있다. 이러한 단점을 극복하기 위해 자가 조립 단층막법(Self-Assembled Monolayers; SAMs)을 이용하여 기판을 기능화한 후 그 위에 그래핀을 전사하면, 자가 조립 단층막의 기능기에 따라 그래핀의 일함수를 조절 가능하고 운반자 농도나 도핑 유형을 변화시켜 소자의 전기적 특성을 최적화 할 수 있다 [1-3]. 본 연구에서는 PET(polyethylene terephthalate) 기판에 SAMs를 이용하여 유연하고 투명한 그래핀 전극을 제작하였다. 자외선 오존처리 (UV ozone treatment)를 이용하여 PET 기판 표면 위에 하이드록실 기(Hydroxyl group; -OH)를 기능화 화였고 이를 접촉각 측정(Contact angle measurement)을 통해 확인하였다. 또한 3-Aminopropyltriethoxysilane(APTES)와 톨루엔 (toluene)을 이용하여 PET 기판 표면 위의 하이드록실 기 위에 아민 기(Amine group; -NH2)를 기능화 하였고 이를 X-선 광전자 분광법(X-ray photoelectron spectroscopy: XPS)으로 분석하였다. 이렇게 만들어진 PET기판 표면 위에 화학적 기상 증착법을 이용하여 합성한 대면적의 균일한 그래핀을 전사하였다. NH2그룹에 의해 그래핀에 도핑 효과가 나타난 것을 라만 분광법(Raman spectroscopy)과 전류-전압 특성곡선(I-V characteristic curve)을 이용하여 확인하였다. 본 연구 결과는 유연하고 투명한 기판 위에 안정적이면서 패턴이 가능하기 때문에 그래핀을 기반으로 하는 반도체 소자에 적용 가능할 것이라 예상된다.

• Fibers and Polymers
• /
• v.5 no.4
• /
• pp.321-326
• /
• 2004

[ $TiO_2$ ] contents in yarns can influence color yield so that dyeing quality of industrial polyethylene terephthalate (PET) yarns can be improved through the adjustment of $TiO_2$ contents. To evaluate the dyeing performance of color yield, the chips which included the different $TiO_2$ contents of 330,550, and 1,100 ppm respectively were used to produce the yarns of different $TiO_2$ content by a spin-draft machine. The physical and structural properties of the yarns were measured to investigate effect of the $TiO_2$ contents on them. Dye uptake and dyeing rate were also evaluated using a colorimeter to compare the yarns having different TiOz contents. The experimental results showed that there were no appreciable variation in physical and structural properties among the yarn samples and no difference were observed among the dyed fabric samples with regard to dyeing uptake and dyeing rate. However, the color yield of dyed fabrics increased as $TiO_2$ contents decreased in the yarns especially when the fabric samples were dyed to pale shade. The physical reasoning could be proposed on why the yarns having low $TiO_2$ contents appeared to have higher color yield after dyeing.

• Journal of the Korean Society of Safety
• /
• v.18 no.4
• /
• pp.92-97
• /
• 2003

The purpose of this study is heavy metal absorption of recycled PET(poly ethylene terephatalate) NWF(non woven faric). The results of test are summarized as follows; Heavy metal abworption rates in Ni ions were higher then Zn and Cu ions, whereas heavy metal absorption rates by sulfonation times were not different. The heavy metal absorption times have a higher tendency from 60 min to 120 min. There were significant negative correlations among the amount used CSA(Chloro Sulfuric Acid) and the amount of absorption Zn(r = -0.33784, p < 0.05), Cu(r = -0.61177, p < 0.01) ions, whereas correlations between heavy metal absorption rates and sulfonation times were not significant. There were significant positive correlations among the amount of absorption Zn ions and the amount of absorption Ni(r = 96475, p < 0.014), Cu(r = 0.51614, p < 0.01) ions, likewise the positive correlations between the amount of absorption N ions and the amount of absorption Cu(r = 0.54766) ions were significant(p < 0.01).