• Title/Summary/Keyword: Poly-Butylene-Terephthalate(PBT)

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Comparison of the Properties of Poly(butylene terephthalate) Nanocomposite Fibers with Different Organoclays

  • Kim, Jeong-Cheol;Chang, Jin-Hae
    • Macromolecular Research
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    • v.15 no.5
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    • pp.449-458
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    • 2007
  • The aims of this study were to investigate the intercalation of polymer chains with organoclays and improve the thermo-mechanical properties of poly(butylene terephthalate) (PBT) hybrids by comparing PBT hybrids synthesized using two different organoclays. The organoclays; dodecyltriphenylphosphonium-montmorillonite ($C_{12}PPh-MMT$) and dodecyltriphenylphosphonium-mica ($C_{12}PPh-Mica$), were used to fabricate the PBT hybrid fibers. Variations in the properties of the hybrid fibers with the organoclays within the polymer matrix, as well as the draw ratio (DR), are discussed. The thermo-mechanical properties and morphologies of the PBT hybrid fibers were characterized using differential scanning calorimetry, thermogravimetric analysis, wide-angle X-ray diffraction, electron microscopy and mechanical tensile properties analysis. The nanostructures of the hybrid fibers were determined using both scanning and transmission electron microscopies, which showed some of the clay layers to be well dispersed within the matrix polymer, although some clustered or agglomerated particles were also detected. The thermal properties of the hybrid fibers were found to be better than those of the pure PBT fibers at a DR = 1. The tensile mechanical properties of the $C_{12}PPh-MMT$ hybrid fibers were found to worsen with increasing DR. However, the initial moduli of the $C_{12}PPh-Mica$ hybrid fibers were found to slightly increase on increasing the DR from 1 to 18.

Depolymerization of waste Poy(butylene terephthalate) by saponification (비누화반응에 의한 폐 Poly(butylene terephthalate)의 해중합)

  • Yoo, Ji-Hwan;Na, Sang-Kwan;Hong, Wan-Hae;Kim, Jung-Gyu
    • Elastomers and Composites
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    • v.37 no.2
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    • pp.124-133
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    • 2002
  • Waste PBT powder was depolymerized by saponification under the mild temperature conditions($80{\sim}110^{\circ}C$) and atmospheric pressure. In depolymerization of PBT, sodium hydroxide was more effective than potassium hydroxide. The depolymerization increased with increasing reaction temperature and decreasing particle size. The reaction kinetics of depolymerization could be expressed by the shrinking unreacted core model without product layer, in which the surface reaction was a rate determining step. The activation energy was 98.1 KJ/mol. The recovery ratio of the TPA obtained from the depolymerized PBT particles of 85.1 and $105{\mu}m$ for 6 hours was about 95%.

Transesterification Kinetics of Bis(2-Hydroxyethyl) Terephthalate with 1,4-Butandiol (Bis(2-Hydroxyethyl) Terephthalate와 1,4-Butanediol의 에스테르 교환 반응)

  • Jeon, Hyeongcheol;Han, Myungwan
    • Korean Chemical Engineering Research
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    • v.56 no.1
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    • pp.103-111
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    • 2018
  • Transesterification of BHET (Bis (2-Hydroxyethyl) Terephthalate), monomer of PET (Poly Ethylene Terephthalate) to BHBT (Bis (4-Hydroxybutyl Terephthate), monomer of PBT (Poly Butylene Terephthalate), using 1,4-BD (1,4-butanediol) were investigated. Zinc acetate was used as a catalyst for the reaction. Amounts of BHET, EG, and THF (Tetrahydrofuran) in a batch reactor were measured for determining the reaction kinetics. Mathematical models of the batch reactor for the transesterification reaction were developed and used to characterize the reaction kinetics and the composition distribution of the reaction products. Model predictions for the transesterification were in good agreement with experimental results.

Effect of Drawing Conditions on the Structure of Poly(butylene terephthalate) Film (연신 조건이 PBT Film의 구조에 미치는 영향)

  • 김응수;김상용
    • Proceedings of the Korean Fiber Society Conference
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    • 1998.10a
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    • pp.268-271
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    • 1998
  • Poly(butylene terephthalate) (이하 PBT)는 두 종류의 결정형태를 가지는 고분자로 널리 알려져 있다. 이 두 가지 결정형태를 각각 $\alpha$상 결정과 $\beta$상 결정이라고 하는데, 이 두 결정형은 방사나 연신 또는 열처리 등의 공정에 의하여 생성되기도 하고 $\alpha$-$\beta$상 간 전이를 일으키기도 한다[1],[2]. (중략)

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Fine Structure Formation and Properties with Take-up Velocities and Solvent Treatment Conditions of Poly(butylene terephthalate) Fibers (Poly(butylene terephthalate) 섬유의 방사속도와 용제처리조건에 따른 미세구조 형성과 물성)

  • 이선희;조현혹
    • Proceedings of the Korean Fiber Society Conference
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    • 2001.10a
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    • pp.456-458
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    • 2001
  • PBT는 엔지니어링 플라스틱용으로 전기ㆍ전자부품, 자동차부품에 주로 사용되며 이 두 종의 용도로 약 80%정도 소비된다. 섬유로 사용하는 것은 매우 소량이다. PBT섬유는 가연가공하여 주로 사용되며 스트레치 가공사로 되었을 때 중요한 특징은 권축의 신장회복성이 PET 및 나일론 6 섬유보다 아주 우수하다는 것이다. (중략)

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The Characteristics of Poly(ethylene naphthalate)/Poly(butylene terephthalate) Blends (폴리(에틸렌 나프탈레이트)/폴리(부틸렌 테레프탈레이트) 블렌드 물성 고찰)

  • Kim Hyokap;Kang Ho-Jong
    • Polymer(Korea)
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    • v.30 no.1
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    • pp.22-27
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    • 2006
  • The effect of transesterification on the rheological property of poly(ethylene naphthalate)/poly(butylene tore-phthalate) (PEN/PBT) blends has been investigated. The melt viscosity of PEN/PBT blends decreased with increasing PBT content due to the relatively low melt viscosity of PBT as well as introducing ransesterification between PEN and PBT Further melt viscosity decrease was achieved by the thermal annealing which caused both the chain scission and the acceleration of transesterfication. Calcium stearate (CaST) was applied as a lubricant in order to lower the melt viscosity of PEN and it was found that CaST was acting as the catalyst of transesterification as well. In general, reactive melt blending of PEN and PBT by transesterification resulted in the decrease of molecular weight of PEN and PBT, as a result, the loss of mechanical properties in PEN/PET blend was inevitable.

Production of PBT(polybutylene terephthalate) Oligomer from Recycled PET(polyethylene terephthalate) (재활용 PET(polyethylene terephthalate)를 이용한 PBT(polybutylene terephthalate) 올리고머 제조)

  • Cho, Minjeong;Yang, Jeongin;Noh, Seunghyun;Joe, Hongjae;Han, Myungwan
    • Korean Chemical Engineering Research
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    • v.54 no.4
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    • pp.437-442
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    • 2016
  • A new route for PBT (Poly butylene terephthalate) production from recycled PET (Poly ethylene terephthalate) has been explored. The route consists of glycolysis of PET (Poly ethylene terephthalate) wastes using 1,4-butandiol into BHBT oligomers and polycondensation of the oligomers into PBT oligomer. This process uses post-consumer or post-industrial recycled PET and converts it into high-end PBT type engineering thermoplastic via a chemical recycling process. Zink acetate was used as a catalyst for both glycolysis and polycondensation. Two types of reactor for the glycolysis, batch and semi-batch reactor, were investigated and their performances were compared. Semi-batch reactor removes ethylene glycol (EG) and THF (tetrahydrofuran) during the reaction. Amounts of EG and THF generated during the glycolysis reaction were measured and used as criteria for the reactor performance. Performance of semi-batch reactor was shown to be better than that of batch reactor. Optimum reaction condition for the semi-batch reactor was BD/PET ratio of 4, and reaction temperature of $220^{\circ}C$, giving high EG yield (max 91%) and low production of THF. In addition, it was confirmed that the molecular weight of PBT oligomer increases in accordance with the progress of the polycondensation reaction.

A Study on the Mechanical Properties of PBT/ABS blends (PBT/ABS 블렌드의 물성에 관한 연구)

  • 이중희;윤기호;박민정
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2001.10a
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    • pp.149-152
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    • 2001
  • Poly-butylene-terephalate(PBT) can be impact modified by blending with ABS material. The effects of the type of compatibilizer and ABS content on the mechanical properties of PBT/ABS blend were examined in this study. EVA-g-GMA and three type of polycarbonates were used as the compatibilizer. As the GMA content in EVA-g-GMA was increased, the tensile strength of PBT/ABS blend increased and the impact strength of it decreased. With increasing the EVA-g-GMA content in PBT/ABS blend, the tensile strength and impact strength decreased. With PC compatibilizer, the tensile strength of PBT/ABS blend decreased as the ABS content increased. However, the maximum impact strength was observed in 20~30% ABS content range.

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Transesterification Reaction between Liquid Crystalline Polyester and Poly(butylene terephthalate) (액정 폴리에스테르와 Poly(butylene terephthalate)의 에스테르 교환반응)

  • Han, Do Soo;Kim, Doo Hwa;Cho, Sung Dong;Jo, Byung Wook
    • Journal of the Korean Chemical Society
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    • v.41 no.3
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    • pp.157-165
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    • 1997
  • The transesterification reaction could be used to the technical production as it forms an in-situ compatibilizer during the processing of polymer blends. Thus, TR-4,6(poly(tetramethylene-4,4'-terephthaloyldioxydibenzoate-co-hexametylene-4,4'-terephthaloyldioxydibenzoate), one of thermotropic liquid crystalline polymers was synthesized and was blended with PBT(polybutylene terephthalate), one of engineering plastics, to study the transesterification reaction. The transesterification reactions between two components, TR-4,6 and PBT, were monitored by IR, DSC and $^{13}C-NMR$ and analyzed by a statistical treatment method. Also, the reaction rates and the sequence distributions of repeating unit were (calculated and) invesitigated.

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Fine structural characteristics of Poly(butylene terephthalate) sheets prepared from roll-drawing (롤 연신에 의한 PBT시트의 미세구조적 특성)

  • Lee, Sun-Hee;Satoru Furunishi;Cho, Hyun-Hok;Kazuo Nakayama
    • Proceedings of the Korean Fiber Society Conference
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    • 2003.04a
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    • pp.243-246
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    • 2003
  • Poly(butylene terephthalate)(PBT) is an important engineering polyester. It crystallizes much more easily and faster than PET. And these crystallization properties determine its use as an injection molding resin. Although it is more extensive than PET, its crystallization can be controlled much more easily during processing. General electric (Schenectady, NY) is the main producer of PBT films. Its production capacity was 3-5million pounds per year in 1987. (omitted)

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