• Title/Summary/Keyword: 폴리우레탄 고무

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Synthesis and Physical Properties of Waterborne Polyurethane Microgels (수분산성 폴리우레탄 마이크로겔의 합성과 물성)

  • Kim, Kong-Soo;Kim, Tae-Kyung;Oh, Geul-Jung;Kim, Sang-Ki
    • Elastomers and Composites
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    • v.35 no.4
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    • pp.281-287
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    • 2000
  • Waterborne polyurethane(PU) microgel dispersions were synthesized with different mole ratio of polytetramethylene glycol(PTMG) to dimethylol propionic acid(DMPA). Particle size distribution, thermal and mechanical properties of the PU microgels were investigated. Particle size of the microgels was distributed in the range of $98{\sim}$680{\mu}m$ and decreased with increasing the mole ratio of DMPA and 1,2,6-hexanetriol. Glass transition temperature and melting temperature of the microgels were in the range of $-79.7 {\sim}-78.1^{\circ}C$, $22{\sim}24^{\circ}C$ respectively. Tensile strength and elongation of the PU microgel films were maximum in the case of 60/40 mole ratio of PTMG/DMPA.

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A Study on the Properties of Polyvinyl Acetate Emulsion Mixed with SBR, Polyurethane and Epoxy Latex (SBR, 폴리우레탄 및 에폭시 라텍스를 혼합한 폴리초산비닐 에멀젼 수지의 물성에 관한 연구)

  • Suh, Won-Dong
    • Elastomers and Composites
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    • v.33 no.3
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    • pp.149-158
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    • 1998
  • SBR latex, polyurethane latex and epoxy latex were separately mixed with polyvinyl acetate emulsion. The various physical properties were examined for the mixtures. Epoxy mixtures gave a transparent film. Both polyurethane and SBR mixtures showed opaque film with high viscosity. In SBR and polyurethane increase in hardness was dependent on the evaporation rate of water, but in epoxy it was dependent on the degrees of crosslink. Epoxy's showed excellent water-resistance. SBR showed a good flexural strength and impact strength. When vinyl acetate emulsion was mixed with less than 10% latex paper tube showed the ductile fracture, but over latex content 20%, it showed the brittle fracture.

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Studies on Slip and Mechanical Properties of Thermoplastic Polyurethane Elastomer Containing Sulfuric Acid (Sulfuric acid를 도입한 열가소성 폴리우레탄 탄성체의 슬립특성 및 기계적 물성에 관한 연구)

  • Mok, Dong Youb;Shin, Hyun Deung;Kim, Dong Ho;Kim, Gu Ni;Kim, In-Soo
    • Elastomers and Composites
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    • v.48 no.4
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    • pp.256-262
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    • 2013
  • We synthesized thermoplastic polyurethane elastomer (TPU) with different contents of sulfuric acid group, and characterized their physical properties such as mechanical, thermal and grip properties. And the results were compared with carboxylic acid-introduced TPU. Wet slip, tensile strength and abrasion properties were increased by the introduction of acid group. Mechanical properties increased with increasing the acid content up to 0.3 wt%. However, wet slip was continually increased as the acid content increased due to increase of hydrophilicity of TPU.

Synthesis and Characterization of Thermotropic Liquid Crystalline Polyurethanes (액정폴리우레탄의 합성 및 특성)

  • Lee, Jong-Back;Lee, Kwang-Hyun;Kang, Byung-Chul;Lee, Dong-Jin
    • Elastomers and Composites
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    • v.44 no.3
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    • pp.329-335
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    • 2009
  • Four series of novel liquid crystalline polyurethanes were synthesized by the polyaddition reaction of diisocyanates such as 2,6-tolylene diisocyanate (2,6-TDI), 2,5-tolylene diisocyanate (2,5-TDI), 2,4-tolylene diisocyanate (2,4-TDI), and 1,4-phenylene diisocyanate (1,4-PDI) with 4,4'-bis(5-hydroxypentoxy)biphenyl (BP5). 4,4'-bis(5-hydroxypentoxy)biphenyl exhibited a smectic type mesophase. Mesophase was found for all synthesized liquid crystalline polyurethanes except 1,4-PDI/BP5. The structures and the thermal properties of polyurethanes were studied by using FT-IR and ^1H$ NMR spectroscopy, DSC measurements and a polarizing microscope equipped with a heating stage.

2,6-Naphthalenedicarboxylate기를 함유하는 폴리에테르에스테르 탄성체의 열적, 동력학적성질에 관한 연구

  • 안태환;박연흠
    • Proceedings of the Korean Fiber Society Conference
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    • 1998.04a
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    • pp.85-90
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    • 1998
  • 고무와 같은 유연성과 탄성을 가지면서 가유 필요없이 열가소성 성형기로 성형이 가능한 열가소성 탄성체는 1958년 E.I DuPont에 의해 폴리우레탄계 탄성섬유가 최초로 개발된 이래 낮은 생산원가와 대량생산이 쉬운 이점 때문에 많은 종류의 화합물이 개발되어 사용되고 있다.(중략)

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Synthesis and Characterization of Liquid Crystalline Polyurethanes Containing Aromatic Ring Moiety (방향족 고리를 갖는 액정폴리우레탄의 합성 및 특성)

  • Lee, Jong-Baek
    • Elastomers and Composites
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    • v.48 no.2
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    • pp.141-147
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    • 2013
  • Polyurethanes containing no mesogenic unit were prepared by polyaddition reaction of homo- and copolyurethanes based on para-type 1,4-phenylene diisocyanate (1,4-PDI), 2,6-bis($\omega$-hydroxypentoxy)naphthalene (BHN5) with 1,4-bis($\omega$-hydroxypentoxy)benzene (BHB5). All copolyurethanes showed monotropic liquid crystallinity, when measurements were performed under shearing. For example, a polyurethane Poly(50/50, mol%) with $[\eta]$=0.32 dL/g exhibited liquid crystallinity in the temperature range from $223^{\circ}C$ to $211^{\circ}C$ in the cooling stage. In contrast, two homopolyurethanes exhibited no explicit mesomorphic behavior, which was observed by DSC (Differental Scanning calorimeter) and measurement and polarized microscopic observation. The mesomorphic behavior of synthesized polyurethane was identified and characterized by differential scanning calorimetry, polarized optical microscope and X-ray.

Effects of Mold Temperatures on Physical Properites of Injection Molded Thermoplastic Polyurethanes (사출성형 열가소성 폴리우레탄의 물리적 성질에 미치는 금형 온도 영향)

  • Lee, Dai-Soo;Kim, Seong-Geun;Nguyen, Vinh-Khanh;Lee, Wing-Ji;Pang, Su-Jin
    • Elastomers and Composites
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    • v.39 no.4
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    • pp.286-293
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    • 2004
  • Ester- and ether-based thermoplastic polyurethanes of different hardness were injection molded at different mold temperatures and effects of mold temperature on the physical properties of TPUs were investigated. Glass transition temperatures of soft segments of TPUs were hardly changed by mold temperatures. The phase separation of soft and hard segments of injection molded TPUs were affected little by mold temperatures. However, crystallinity of hard segments, temperature range of rubbery plateau, and tensile strength of injection molded TPUs decreased with increasing mold temperatures for TPUs of high hardness. However, injection molded TPUs of low hardness showed increases of crystallinity of hard segments, temperature range of rubbery plateau, and tensile strength with increasing mold temperatures. Different physical properties of injection molded TPUs depending on mold temperatures were attributed to different crystallization and physical crosslinking effects of hard segments.

Synthesis and Properties of Linear and Crosslinkable Polyurethane Elastomers (선형과 가교형 수분산 폴리우레탄 엘라스토머의 합성 및 물성)

  • Choi, Sung-Ro;Lee, Su-Min;Kim, Hyun-Min
    • Elastomers and Composites
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    • v.37 no.1
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    • pp.39-48
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    • 2002
  • Linear and crosslinked polyurethane dispersions were synthesized with 2,4-toluene diisocyanate, dimethylol propionic acid, polyoxypropylene glycol and polyoxypropylene glycerin. The structures of these polyurethanes were characterized by $^1H-NMR$ and FT-IR and the properties were measured with DSC, TGA, Instron and AFM etc. In case of linear polyurethane dispersion, the particle size, viscosity and glass transition temperature of polyurethanes increased with higher molecular weight of polyol and the degree of crosslinking. The crosslinked polyurethanes which contains more than 15% of polyoxypropyleneglycerin didn't from dispersion, when mixtures by polyoxypropyleneglycol and polyoxypropyleneglycerin were used as polyols. Thus, we synthesized crosslinked polyurethanes with 5%, 8%, 13% and 15% weight percents of polyoxypropylene glycerin as polyol mixtures.

Preparation and Adhesion Characteristics of Binary Blended Waterborne Polyurethane (이성분계 혼합 폴리우레탄 수분산체의 제조 및 접착 특성 연구)

  • Kim, Eun Ji;Park, In Kyu;Park, Jae Hyung
    • Journal of Adhesion and Interface
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    • v.19 no.1
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    • pp.5-12
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    • 2018
  • The purpose of this study is to evaluate the adhesive properties of polyurethane mixed aqueous dispersions by omitting the primer, dealing with the preparation of skins for synthetic leather with excellent adhesion by omitting the pre-treatment process. The two-component mixed polyurethane water dispersion was prepared by synthesizing an ester-based polyurethane resin (PU-T) and a carbonate-based polyurethane resin (PU-C) to obtain the final resin. As a result of measuring the peel strength of the adhesive specimens omitting the pre-treatment agent, it was confirmed that the state adhesive strength (ethylene vinyl acetate (middle): $4.2kg_f/cm$ and rubber (outsole): $4.4kg_f/cm$) there was. This makes it possible to omit the pre-treatment process which has been indispensably used in the shoe manufacturing process, thereby reducing the process time and reducing the amount of volatile organic compounds (VOCs) generated in the pre-treatment product, resulting in environmentally advantageous.

Filler-Elastomer Interactions. 9. Effect of Thermal Treatment on Mechanical Interfacial Characteristics of Silica/Polyurethane Composites (충전제-탄성체 상호작용. 9. 실리카/ 폴리우레탄 복합재료의 기계적 계면특성에 미치는 열처리의 영향)

  • Park, Soo-Jin;Cho, Ki-Sook;Zaborski, M.;Slusarski, L.
    • Elastomers and Composites
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    • v.37 no.4
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    • pp.258-264
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    • 2002
  • In this work, the influence of thermal treatment on surface properties of silicas and mechanical interfacial properties of silicas/polyurethane composites was investigated. The surface properties of thermally treated silicas were studied in the context of Fourier Transform-IR (FT-IR), solid-state 29Si NMR spectroscopy, and contact angle. And the mechanical interfacial properties of the silica/polyurethane composites were evaluated by composite tearing energy (GIIIC). As a result, it was found that the thermally treated silica surfaces became hydrophobic in nature, due to the condensation of surface hydroxyls and the formation of siloxane bonds, resulting in increasing the London dispersive component of surface free energy. From which, the increase of the London dispersive component of the silicas led to an improvement of the dispersion of silicas in a polyurethane matrix, finally resulting in improving the tearing energy (GIIIC) of the silicas/polyurethane composites.