• Title, Summary, Keyword: modified polyethylene terephthalate(PET)

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Study on the Hydrophilicity of Modified Polyester (개질시킨 폴리에스테르 중합체의 친수성 연구)

  • Jung, Byung-Ok
    • Applied Chemistry for Engineering
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    • v.9 no.6
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    • pp.930-934
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    • 1998
  • The modified poly(ethylene terephthalate) (PET) was synthesized by copolymerizing dimethyl terephthalate with ethylene glycol, polyethyleneglycol, and dodecylbenzene sulfonate as a surfactant. After characterization of viscosity, color, and contant angle, hydrophilic characteristics of the modified PET depending on additives was discussed.

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Development of Synthetic Sizing Agent Using Recycling Polyethylene Terephthalate and its Sizing Efficiency (Part 2) - Sizing efficiency of modified PET - (재활용 PET를 활용한 합성 사이즈제 개발 및 종이의 내수성 부여에 관한 연구 (제2보) - 개질 PET의 내수특성 평가 -)

  • Park, Jae-Seok;Kim, Hyoung-Jin
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.42 no.2
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    • pp.95-101
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    • 2010
  • For the development of higher-sizing performance of paper, a sizing agent using recycled PET was synthesised. Polyester resin was extracted from wasted PET by subcritical hydrolysis and finally modified to synthetic sizing agent by mixing water-disperse PET with triphenyl phosphite(TPP). The modified PET was considered as an internal sizing agent in different wet-end papermaking conditions. The optimum condition in sizing efficiency was obtained in initial pH of 6.5 in case of rosin+alum system, and 7.5 in case of rosin+alum+PET system, respectively, and in addition amount of PET 3%. The sizing efficiency was also closely related according to the fiber properties of wet-end slurry, such as virgin fibres from UKP and recycled fibres from KOCC. The application of modified PET was good in strength improvement of paper, specially in tensile strength.

Conjugate Spun of Polyethylene Terephthalate Resin Modified with 1,4-Cyclohexanedimethanol

  • Bang, Ho-Ju;Kim, Hak-Yong;Jin, Fan-Long;Woo, Je-Wan;Park, Soo-Jin
    • Bulletin of the Korean Chemical Society
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    • v.32 no.2
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    • pp.541-546
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    • 2011
  • In this study, conjugate fibers were prepared from 1,4-cyclohexanedimethanol-modified polyethylene terephthalate (PET) resin using side by side conjugate spinning, sea-island type conjugate spinning, and split type conjugate spinning methods, and the properties of the conjugate fibers were investigated via several techniques. When viscosity increased, the tenacity of side by side conjugate fibers was increased, whereas elongation decreased. The sea-island conjugate fibers showed lower weight loss and surface color difference (K/S) values relative to that of regular PET fibers at the same conditions. The SEM results indicate that orange type spilt readily produced at a temperature range of 120 - 140$^{\circ}C$.

Crystallization Behavior of PET Modified by Pentanediol units (Pentanediol unit로 개질된 PET의 결정화 거동)

  • Lee, Sun-Hui;Sim, Mi-Ja;Kim, Sang-Wook
    • Korean Journal of Materials Research
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    • v.2 no.2
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    • pp.101-109
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    • 1992
  • 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.

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Effect of Compatibilizer Types on the Properties of Linear PPS/PET Blends (상용화제의 종류가 선형 PPS/PET 블렌드의 물성에 미치는 영향)

  • Kim, Sungki;Hong, In-Kwon;Lee, Sangmook
    • Polymer Korea
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    • v.37 no.4
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    • pp.500-506
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    • 2013
  • The effect of compatibilizer types on the properties of polyphenylene sulfide (PPS)/polyethylene terephthalate (PET) blends was investigated. The blends were extruded by a single screw extruder attached with a Maddock mixing zone and their molded properties were examined. As a basic blend composition, a linear PPS/PET (40/60) blend was selected based on cost efficiency. Three types of compatibilizer, SEBS, modified SEBS, and modified PS were added to the basic blend to improve the properties. The thermal, rheological, mechanical properties and the morphology of the ternary blends were analyzed. The maximum mechanical properties of blends was found at 1 phr of m-SEBS or m-PS content, whose values were almost the same as the theoretical values of miscible blend system. It seemed to by the case that the partial reaction between compatibilizer and the basic blend caused the enhancement of compatibility between linear PPS and PET phases. These ternary blends would be applicable as economic linear PPS alloys.

Preparation of Antistatic Polyester Materials and Their Properties (I) (뱅겐성 폴리에스테르 소재의 제조와 성질(I))

  • 박연홈;박학수;남성우;박종래
    • Textile Science and Engineering
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    • v.29 no.7
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    • pp.54-62
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    • 1992
  • Modified polyethylene terephtalate(M-PET) was obtained by copolymerizing dimethyl terephthalate(DMT), ethylene glycol, and dimethyl 5-sulfoisophthalate(DMS) and antistatic polyester material has been prepared by exposing M-PET containg ferric chloride to pyrrote vapor. The DMS component in M-PET was confirmed by the analysis of IR and NMR spectra. The formation of polypyrrole(PPy) in M-PET matrix was also confirmed by the analysis of IR spectrum. The changes of physical structure due to the insertion of ferric chloride and formation of PPy in M-PET have been investigated by analysing wide-angle X-ray diffraction curves. The surface of the antistatic polyester film showed the continuous phase of granular PPy, which was formed through the film thickness. The physical properties of antistatic polyester was satisfiable, that was, the tensile strength and the elongation at break retained 80 and 90% of those of M-PET matrix, respectively. But the modulus retained about 60% of M-PET matrix.

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Preparation of PET Nanocomposites: Dispersion of Nanoparticles and Thermal Properties

  • Her, Ki-Young;Kim, Dae-Heum;Lim, Soon-Ho
    • International Journal of Precision Engineering and Manufacturing
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    • v.9 no.4
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    • pp.71-73
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    • 2008
  • The development of polymer/inorganic nanocomposites has attracted a great deal of interest due to the improved hybrid properties derived from the two different components. Various nanoscale fillers have been used to enhance polymer mechanical and thermal properties, such as toughness, stiffness, and heat resistance. The effects of the filler on the final properties of the nanocomposites are highly dependent on the filler shape, particle size, aggregate size, surface characteristics, polymer/inorganic interactions, and degree of dispersion. In this paper, we describe the influence of different $CaCO_3$ dispersion methods on the thermal properties of polyethylene terephthalate (PET)/$CaCO_3$ composites: i.e., the adsorption of $CaCO_3$ on the modified PET surface, and the hydrophobic modification of the hydrophilic $CaCO_3$ surface. We prepared PET/$CaCO_3$ nanocomposites using a twin-screw extruder, and investigated their thermal properties and morphology.

Characterizationof Graphene Modified by Self-Assembled Monolayers on Polyethylene Terephthalate Film

  • Jo, Ju-Mi;Jeong, Dae-Seong;Kim, Yu-Seok;Song, U-Seok;Adhikari, Prashanta Dhoj;Cha, Myeong-Jun;Lee, Su-Il;Jeong, Sang-Hui;Park, Sang-Eun;Park, Jong-Yun
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.616-616
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    • 2013
  • 그래핀(Graphene)은 열전도도가 높고 전자 이동도(200,000 cm2V-1s-1)가 우수한 전기적 특성을 가지고 있어 전계 효과 트랜지스터(Field effect transistor; FET), 유기 전자 소자(Organic electronic device)와 광전자 소자(Optoelectronic device) 같은 반도체 소자에 응용 가능하다. 최근에는 아크 방출(Arc discharge method), 화학적 기상 증착법(Chemical vapor deposition; CVD), 이온-조사법(Ionirradiation)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 자가조립 단층막법(Self-assembled monolayers; SAMs)을 이용하여 기판을 기능화한 후 그 위에 그래핀을 전사하면, 자가조립 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. 산소 플라즈마와 3-Aminopropyltriethoxysilane (APTES)를 이용하여 PET 기판 표면 위에 하이드록실 기(Hydroxyl group; -OH)와 아민 기(Amine group; -NH2)를 순차적으로 기능화 하였고, 그 위에 화학적 기상 증착법을 이용하여 합성한 대면적의 균일한 그래핀을 전사하였다. PET 기판 위에 NH2 그룹이 존재하는 것을 접촉각 측정(Contact angle measurement)과 X-선 광전자 분광법(Xray photoelectron spectroscopy: XPS)을 통해 확인하였으며, 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.

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Improvement of Interfacial Adhesion between Metal and Polymer by Surface Modification(I) -Chemical Modification of PET and Interfacial Adhesion- (고분자 표면 개질에 의한 금속과 고분자간의 계면접착력 향상에 관한 연구(I) -PET의 화학적 표면개질 및 계몇접착력-)

  • 김은영;공주식;이건환;김한도
    • Textile Science and Engineering
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    • v.37 no.1
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    • pp.11-17
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    • 2000
  • In order to improve the interfacial adhesion between polyethylene terephthalate (PET) and metallic copper (Cu), the surface of PET films was modified by treatment with hydrazine monohydrate. The effect of treatment time within 1~20 min with 80 wt% hydrazine monohydrate at 6$0^{\circ}C$ and 8$0^{\circ}C$, respectively, on the polar group content was investigated. The texture and contact angle of PET film surface, the adhesion strength of PET film and adhesion strength of vacuum-deposited thin copper metal film on the PET film surface were also investigated. The introduction of polar groups on the modified PET folm surface was verified. The amount of polar groups increased up to the maximum value with increasing treatment time up to 10 min at 6$0^{\circ}C$ and 3 min at 8$0^{\circ}C$, and decreased markedly thereafter. The surface roughness increased with increasing treatment time up to 10 min and cracks occurred after 20 min. Water contact angle and tensile properties decreased with increasing treatment time. Using scratch test, the adhesion between Cu film and PET was found to increase with increasing treatment time up to 10 min, and thereafter there was remarkable decrease in adhesion. From these results, it was concluded that the optimum treatment time of hydrazine monohydrate (80 wt%) at 6$0^{\circ}C$ and 8$0^{\circ}C$ were about 10 min and 3 min to improve adhesion of copper/PET, respectively. However, the treatment time of 10 min at 6$0^{\circ}C$ was observed to be more effective than that of 3 min at 8$0^{\circ}C$ to incorporate polar group on the PET surface and to improve adhesion between metallic Cu and PET.

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Thermal and Acoustic Properties of Nanofilament Fabrics (나노필라멘트 직물의 열 및 음향학적 특성에 관한 연구)

  • Lee, Nu Ri;Min, Mun Hong;Kim, Han Seong
    • Textile Science and Engineering
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    • v.52 no.2
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    • pp.113-119
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    • 2015
  • Nanofibers, which have larger specific surface areas than conventional fibers, significantly enhance the functionality of conventional fiber materials in addition to introducing new features. Thermal barrier and sound insulation tests were conducted to assess the thermal and acoustic properties of the nanofilament fabrics prepared from polyethylene terephthalate (PET)/modified PET sea-island bicomponent fibers. The results indicate that fabrics with filament diameter of 400 nm exhibited excellent thermal and sound insulation performance compared to the fabrics with filament diameter of 600 nm.