• Title, Summary, Keyword: Poly(ethylene terephthalate)

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Recycling of Poly(ethylene terephthalate) via Methanolysis without Catalyst (무촉매 메탄올 분해에 의한 Poly(ethylene terephthalate)의 재활용에 관한 연구)

  • Lee, Yoon-Bae;shin, Jae-Sick
    • Clean Technology
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    • v.8 no.1
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    • pp.39-44
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    • 2002
  • In order to recycle poly(ethylene terephthalate), methanolysis has been investigated at elevated temperature and under high pressure without catalyst to afford dimethyl terephthalate and ethylene glycol. The reaction was carried out under 62 atm, $310^{\circ}C$ for 50min to obtain 98% dimethyl terephthalate. The method has been suggested as a simple and economical one to recycle the poly(ethylene terephthalate).

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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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Rheological anomalies of the poly(ethylene 2, 6-naphthalate) and poly(ethylene terephthalate) blends depending on the compositions

  • Lee, Hyang-Mok;Suh, Duck-Jong;Kil, Seung-Bum;Park, O-Ok;Yoon, Kwan-Han
    • Korea-Australia Rheology Journal
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    • v.11 no.3
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    • pp.219-223
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    • 1999
  • The effects of the transreactions on the rheological properties have been found in the poly(ethylene 2, 6-naphthalate) (PEN) and poly (ethylene terephthalate) (PET) blends. The rheological properties were very much dependent on the blend compositions, which, in turn, were related to extent of the reactions. In particular, a blend with 50/50 wt% composition exhibits an unusual and remarkable decrease in complex viscosity and it may be related to the randomness of the copolymer structure through transreactions. It has been identified by investigating the extent of transreactions and block length of the copolymer from the (ethylene 2, 6-naphthalate) (EN) and (ethylene terephthalate) (ET) units from $^1{H}$ n.m.r. spectra.

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Physical Properties of Poly(ethylene terephthalate)-Poly(1, 4-phenylene terephthalate) Copolyester (Poly (ethylene terephthalate)-Poly (1, 4-phenylene terephthalate) Copolyester의 물성)

  • Ahn, Tae Oan;Nam, Byeong Uk;Park, Jong-Yoon
    • Applied Chemistry for Engineering
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    • v.2 no.3
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    • pp.246-252
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    • 1991
  • Copolyesters (PEHT) of poly (ethylene terephthalate) (PET) and poly (1,4-phenylene terephthalate) (PHT) were synthesized by the solution polymerization with the PHT unit contents of less than 30 mol %, and their physical properties were studied. As the content of PHT unit in PEHT was increased, glass transition temperature, crystallization rate, thermal stability increased, whereas melting temperature decreased. When the PHT unit contents were 16.5 and 24.9 mol%, nematic mesophase was observed. Wide angle X-ray diffraction pattern showed the peaks originated from both PET unit and PHT unit.

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Synthesis and Characterization of Poly(ethylene terephthalate/trimethylene terephthalate) (P(ET/TT)) for Supermicro Deep-tone Polyester (심색성 극세 폴리에스터 제조용 Poly(ethylene terephthalate/trimethylene terephthalate) (P(ET/TT))의 합성 및 특성)

  • Lee, Jong-Soon;Choi, Young-Gun;Kim, Do-Kyun;Kim, Kap-Jin
    • Textile Science and Engineering
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    • v.43 no.4
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    • pp.201-210
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    • 2006
  • Polyester microfiber has usually greater dye uptake than normal denier polyester fiber at the same dyeing condition. Though polyester has high dye uptake, dyed microfiber fabric has not only low visual colour depth but also poor washing fastness property. In order to improve this dyeing property, poly(ethylene terephthalate/trimethylene terephthalate)(ET/TT) was synthesized with various TT content using DMT process. The feed ratio of TT was varied from 5-30 mol%. The content of TT unit in P(ET/TT) was higher than the feed ratio of TT. The physical properties, dyeing properties, and wet fastness of P(ET/TT) were investigated. Melting $point(T_m)$ and glass transition $temperature(T_g)$ of P(ET/TT) decreased with increasing content of TT unit. P(ET/TT) could be dyed at lower temperature than homo PET with increasing TT feeding content. Alkaline dissolution behavior of P(ET/TT) was also examined as a function of TT content.

Thermal Degradation and Cyclodepolymerization of Poly(ethylene terephthalate-co-isophthalate)s

  • Yoo, Dong Il;Shin, Younsook;Youk, Ji Ho
    • Fibers and Polymers
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    • v.2 no.2
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    • pp.75-80
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    • 2001
  • The thermal degradation of poly(ethylene terephthalate-co-isophthalate)s (PETIs) is investigated by using isothermal thermogravimetric analysis at the temperature range of 280-31$0^{\circ}C$. The degradation rate of PETIs is increased as the mole ratio of ethylene isophthaloyl (EI) units in PETIs increases. The activation energies for the thermal degradation of poly(ethylene terephthalate), PETI(5/5), and poly(ethylene isophthalate) are 33.4, 16.6, and 8.9 kcal/mole, respectively. The degradation rate of PETIs is influenced by their volatile cyclic oligomer components formed during the polymerization and the thermal degradation. It is simulated by the rotational isomeric state model that the content of cyclic dimer in PETIs, which is the most volatile cyclic oligomer component, increases with the EI units in PETIs.

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Thermal Degradation Behavior of Poly(alkylene terephthalate)s (테레프탈레이트계 폴리에스터의 열분해 거동에 관한 연구)

  • Kim Ki Jeong;Yeo Jeong Sup;Yoon Ji Young;Kim Joon Ho
    • Textile Science and Engineering
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    • v.42 no.4
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    • pp.228-234
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    • 2005
  • Thermal degradation behavior of the three homologous polyesters, poly(ethylene terephthalate)(PET), poly(trimethylene terephthalate)(PTT) and poly(butylene terephthalate)(PBT) were investigated by using thermogravimetric analysis(TGA) and pyrolysis-gas chromatography-mass spectrometry(PGC-MS). From the results of isothermal thermogravimetry, it was revealed that PTT has higher activation energy of thermal degradation than the other two polyesters. In PGC-MS analysis, the highly volatile products of the polyesters such as acetaldehyde and acetic acid evolved in the early stage of pyrolysis as common degradation products. Benzoic acid, methyl ester of benzoic acid, terephthalic acid and higher oligomers were produced as the main degradation products of poly(alkylene terephthalate)s at longer pyrolysis times. In isothermal pyrolysis, PTT showed the fastest thermal degradation rate among the three polyesters.

Structure and Properties of Drawn Poly(ethylene 2,6-naphthalate)/poly(ethylene terephthalate) Blend Fibers (Poly(ethylene 2,6-naphthalate)/Poly(ethylene terephthalate) 블렌드 섬유의 연신에 의한 구조 및 물성 변화 연구)

  • 서은수;김성훈
    • Textile Science and Engineering
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    • v.40 no.1
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    • pp.20-25
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    • 2003
  • The effects of transesterification and blend composition on the physical properties of drawn PEN/PET blend fibers were investigated. Tensile strength and modulus of PEN/PET blend fibers were increased with increasing PEN content. The X-ray diffraction patterns of blend fibers exhibited less structure development compared with PEN or PET homopolymer fibers. The transesterification reaction leads to a miscible amorphous phase with the result that all blend fibers exhibit a single glass transition temperature between those of the two homopolymers. After drawing and annealing, PET or PEN homopolymer fibers exhibited higher degree of orientation-induced crystallization than PEN/PET blend fibers.

Kinetics of Interchange Reaction between Poly(ethylene Terephthalate) and Poly (butylene Terephthalate) (폴리에틸렌 테레프탈레이트-폴리부틸렌 테레프탈레이트간의 상호 교환반응 속도)

  • 김준호;하완식
    • Textile Science and Engineering
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    • v.31 no.10
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    • pp.788-795
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    • 1994
  • The intermolecular interchange reaction between poly(ethylene terephthalate) and poly(butylene terephthalate) was investigated by a spectroscopic method. The rates of direct ester-ester interchange and alcoholysis reactions were determined by using newly derived rate equations and analytical data of heterolinkages formed. The characterization of heterolinkages formed during the interchange reaction was carried out by means of carbon-13 UWR spectroscopy. It is concluded that the direct ester-ester interchange reaction is more prevailing than the alcoholysis reaction.

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Copolyester Studies VIII. Crystallization Behaviours of Poly(ethylene terephthalate) Modified by the Flexible Diol Unit (Polyester의 개질에 관한 연구 (제8보). 유연한 디올 Unit로 개질된 Poly(ethylene terephthalate)의 결정화 거동)

  • Tae Oan Ahn;Jung Ho Kim;Han Mo Jeong
    • Journal of the Korean Chemical Society
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    • v.32 no.3
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    • pp.276-284
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    • 1988
  • The crystallization behaviours of poly(ethylene terephthalate) modified by 1, 3-propane diol, 1, 5-pentane diol, 1, 6-hexane diol, or poly(ethylene glycol) of molecular weight 300 as a third component were studied by isothermal and nonisothermal crystallization. When the content of the third diol was about 4 mol %, the isothermal crystallization rate at the same supercooling below the melting temperature and the nonisothermal crystallization rate at the same overheating above the glass transition temperature were increased more by the shorter flexible diol unit. On the contrary the nonisothermal crystallization rate at the same supercooling below the melting temperature was increased more by the longer flexible diol unit.

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