• Title/Summary/Keyword: 폴리올

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Adsorption of Hydrophobic Fluid by Polyurethane Foam (폴리우레탄 폼을 이용한 친유성 유체의 흡착)

  • Chai, Joo-Byung;Kim, Byung-Kyu;Shin, Young-Jo
    • Applied Chemistry for Engineering
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    • v.9 no.5
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    • pp.648-653
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    • 1998
  • This study examines the effects of cell size and structure on the oil adsorption by polyurethane (PU) foam. A series of oil-adsorptive PU foam has been prepared, using various molecular weight of polyether polyol (GP-1000, GP-3000, GP-4000, GP-5000), together with TDI-80, water and additives. It was found that the cell size of PU foam decreased with increasing the agitation speed and surfactant content. Oil-adsotption of PU foam increased over 2000% with the increase of molecular weight of polyol and with the decrease of cell size. Increase in the surfactant content and the viscosity of adsorbed oil also give a remarkable decrease in oil adsorption.

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Production of Biopolyols, Bioisocyanates and Biopolyurethanes from Renewable Biomass (바이오매스 자원을 활용한 바이오폴리올, 바이오이소시아네이트 및 바이오폴리우레탄 제조)

  • Jo, Yoon Ju;Choi, Sung Hee;Lee, Eun Yeol
    • Applied Chemistry for Engineering
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    • v.24 no.6
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    • pp.579-586
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    • 2013
  • The shortage of fossil fuel and problem of greenhouse gas exhaustion drive the production of biopolymer in a environment-friendly manner. Polyurethane is a polymer formed by reacting an isocyanate (-NCO) with a polyol (-OH) to form urethane link (-NHCOO-). Polyurethane is one of the most widely used polymers in automobile, construction and chemical industries. Two monomers for the polymerization of polyurethane, polyols and isocyanates, can be produced from renewable biomass such as plant oil, cellulose, lignin and etc. Biopolyol production from plant oil has already been implemented in commercial-scale production. In this paper, recent progresses on bio-based approaches on the production of biopolyols, bio-isocyanates and bio-substituent or isocyanate from bio-feedstock are reviewed alongside polymerization and characterization of biopolyurethane for industrial applications.

Syntheses and Characterization of UV-curable Polyurethane Acrylates with Eco-friendly Polyols (친환경 폴리올을 이용한 광경화형 폴리우레탄 아크릴레이트의 합성)

  • Lee, Bong;Kim, Yeong Woo;Lee, Won-Ki
    • Journal of Adhesion and Interface
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    • v.20 no.4
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    • pp.140-145
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    • 2019
  • In view of environmental considerations, the control of carbon dioxide (CO2) and volatile organic compounds (VOCs) is one of important issues in the film and coating industries. Therefore, UV-curable system has been developed due to minimize emissions of VOCs and reduce CO2 emission due to low energy consumption from fast curing. Also, biodegradable polymers economically are attractive because of environmental and economic concerns associated with huge waste plastics. In this study, UV-curable polyurethane acrylates with different compositions of biodegradable polylactide (PLA) diol and poly(ethylene glycol) as diols were synthesized and curing reaction of their end-capped acrylates was performed by UV exposure. Tensile strength, elongation, and Tg of the UV-cured polyurethane acrylates increased with PLA diol content in the diol while their hydrophilicity and thermal stability increased with the PEG content. These results indicated a property of UV-cured polyurethane acrylates could be controlled by environment-friendly diols.

A Study on Properties of the Urethane Prepolymer Synthesis with Polyether-diol and Aromatic Diisocyanate System (폴리에테르-디올과 방향족 디이소시아네이트계의 우레탄 프리폴리머 합성에 따른 특성연구)

  • Lee, Hyun-Joo;Kim, Kwang
    • Applied Chemistry for Engineering
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    • v.9 no.4
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    • pp.491-496
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    • 1998
  • The composition of isocyanates and polyols influence prepolymeric properties of adhesive and calking sealant based on polyurethanes (PU). One component moisture curing prepolymers, which reacted with surface humidity of substrate, were synthesized in several kinds of composition. Reactivity, structural change and properties of the prepolymers were studied as a preliminary step to manufacture PU based adhesive and sealant. To study the effects of mole ratio ([NCO]/[OH]), we used toluene diisocyanate (TDI), 4, 4'-diphenylmethane diisocyanate (MDI), and ether-polyols such as PTMG and PPG which have good resistance to hydrolysis and excellent low-temperature properties. The each prepolymers could be prepared in different molecular weight without any significant structural change. The mole ratio 1.78 of [NCO] to [OH] showed the fastest reactivity. It was confirmed that effect of polyols was larger than that of isocyanates on the prepolymer in reactivity. Several kinds of compounds were manufactured with each prepolymer, and tensile and properties were tested. And the optimum quantity of curing accelerator for the PU was 0.05~0.1%. In the tensile test, TDI based PU was superior to MDI based PU, and also PTMG based PU was superior PPG based PU.

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Bubble Growth Analysis in Ultrasonic Foaming using Reaction Injection Molding (반응사출 성형을 이용한 초음파 발포시 기포성장해석)

  • 김찬중
    • The Korean Journal of Rheology
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    • v.7 no.3
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    • pp.237-249
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    • 1995
  • 폴리우레탄 미세포 포움의 가공에 대한 연구를 수행하였으며 기체 과포화 수지 내 의 핵생성율을 증진시키기 위하여 폴리올과 이소시아네이트의 혼합물에 초음파 가진을 적용 하였다. 미세포 구조는 고압에서 질소 가스로 폴리올을 과포화ㅣ키고 폴리우레탄의 두 성분 을 충돌혼합시킨 직후 초음파에 의해 기포를 생성시켜 이루어진다. 낮은 포화 압력에서 질 소에 의해 포화된수지의 핵생성율을 증가시키기위하여 초음파 가진을 적용하였다. 확산에 의해 기포의 성장이 조절된다고 가정하고 금형이 충전되는 동안에 금형 내부에서의 기포성 장기구를 이해하기 위하여 수치적인 방법으로 이론적 연구를 수행하였다. 경화 시간과 확산 경계를 고려하여 최종적인 기포의 크기를 계산하였으며 반응속도론을 고려하여 중합반응 동 안의 폴리우레탄의 점도의 변화를 예측하고 경화 시간을 결정하였다. 이론적 및 실험적으로 결정된 기포의 수를 기준으로 하여 확산 경계를 예측하였다.

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Synthesis of Polyester Polyols by Using Double Metal Cyanide Catalyst and Physical Properties of Polyurethanes Produced by the Polyols (이중금속시안염 촉매에 의한 폴리에스테르 폴리올 제조 및 이를 이용한 폴리우레탄의 물성)

  • Kim, In-Ki;Seo, Hyun-Sook;Ha, Chang-Sik;Park, Dae-Won;Kim, Il
    • Clean Technology
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    • v.14 no.1
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    • pp.29-34
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    • 2008
  • Copolymerizations of propylene oxide (PO) and phthalic anhydride (PA) have been performed in the presence of double metal cyanide (DMC) catalyst as a means of incorporating ester groups in the polyol backbone. DMC catalyst was effective for the copolymerization and the reactivity ratios measured by modified Kelen-$T{\ddot{u}}d{\ddot{o}}s$ equation were $r_1(PA)\;=\;0$, and $r^2(PO)\;=\;0.248$. Four different Polyol samples containing 1.0, 2.1, 7.52, and 11.42 mol% of PA unit were utilized for the synthesis of thermoplastic polyurethanes of their hard segments of 19 wt%. As the incorporated amount of PA increases, the elongation of the resulting polyurethane decreases and the tensile strength and the tensile modulus increase. The modulation of the incorporated amount of PA into polyol backbone was proven to be a feasible way to tune the physical properties of polyurethanes.

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Synthesis and Characterization of Phosphorus Polyurethanes Using Phosphorus Polyols (인계 폴리올을 이용한 난연성 폴리우레탄의 합성 및 특성 분석)

  • Kim, Taeyoon;Kim, Yong Gap;Lim, Chung-Sun;Seo, Bongkuk;Lee, Wonjoo
    • Journal of Adhesion and Interface
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    • v.20 no.2
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    • pp.61-65
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    • 2019
  • In this study, phosphorus polyols, having a molecular weight of 880 to 1,560 g/mol, were synthesized by reacting phenylphosphonic dichloride (PPDC), allylphosphonic dichloride (APDC), and ethylene glycol (EG) in solvent, to enhance flame retardance of polyurethane. Phosphorus polyurethanes were polymerized using the synthesized phosphorus polyols, polycarbonate diol (PCD), and 4,4'-diphenylmethane diisocyanate (MDI) by a melt polymerization method. As increasing phosphorus contents of the phosphorus polyurethanes, we observed that the remaining char amount increased. This tendency was also confirmed in the following UL-94V test. We found that when the synthesized phosphorus polyols were applied, the resulting phosphorus polyurethanes show UL-94V0 grade at above 0.5 wt% phosphorus contents.

Synthesis and Photopolymerization Kinetics of Polyether Urethane Methacrylate Oligomers (폴리에테르 우레탄 메타아크릴레이트 올리고머의 합성 및 광중합 동역학)

  • Oh, Sungae;Park, Kwangbae;Park, Chanik;Bae, Won
    • Clean Technology
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    • v.12 no.1
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    • pp.19-25
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    • 2006
  • In this study, photo-cuarable urethane methacrylate oligomers were synthesized from polyether type polyol (PP series, GP series), isocyanate (2,4-toluene diisocyanate) and hydroxy acrylate (hydroxypropyl methacrylate). We measured basic property including color, viscosity and refractive index of resulting urethane methacrylate. Also we measured tensile strength, elongation, and Young's modulus after photo curing. Photo curing speed was investigated using photo-DSC (TA instrument). In the case of similar polyol structure, as the molecular weight of polyol is increased, tensile strength, Young's modulus, curing rate were decreased, but elongation was increased. As the number of functionality of urethane methacrylate oligomer is increased, tensile strength, Young's modulus, curing rate were increased, but elongation was decreased.

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Pervaporation Separation of Ethanol Aqueous Solution through Carbonate-type Polyurethane Membrane III. The Effect of Zwitterionic Group (카보네이트형 폴리우레탄막을 이용한 에탄올 수용액의 투과증발분리 III. 양쪽이온성기에 의한 영향)

  • Oh, Boo Keun;Lee, Young Moo;Noh, Si Tae
    • Applied Chemistry for Engineering
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    • v.3 no.4
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    • pp.605-613
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    • 1992
  • NCO-terminated prepolymers were synthesized by reacting carbonate-type polyol(PTMCG)($M_w=1,000$ and 2,000) with MDI and N-methyldiethanolamine, as a chain extender. Carbonate-type polyurethane containg zwitterionic group was prepared by reacting the prepolymer with 1,3-propane sultone. From the IR and NMR spectra of model reactions, it was known that the ionization occurred under the same condition. The structure of zwitterionic carbonate-type polyurethane(ZPU) therefore could be confirmed from the model reactions. Glass transition temperature(Tg) ranged between $-15{\sim}-30^{\circ}C$ from the thermal data. Tg was between $-15{\sim}-18^{\circ}C$ for a series of ZPU10 samples and between $-25{\sim}-26^{\circ}C$ for a series of ZPU20 polymers. Tensile strength increased with mole ratio of ionic content. On the contrary, elongation was rather dropped with mole ratio of ionic content. ZPU10-30 having better tensile strength and less elongation was selected as a membrane for the concentration of ethanol aqueous solution through pervaporation. To obtain the better selectivity, it was crosslinked with HMDI. In the swelling test, it showed the higher swelling degree at around 50wt% ethanol concentration due to the plastization effect of ethanol. To optimize the separation capacity, two operating factors-feed concentration and temperature-were considered. The overall separation capacity was as follows : separation factor, 2~83.2 ; the flux, $25.4{\sim}58.8g/m^2hr$.

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Microstructure-Sound Absorption Relationships of Polyurethane Foam and Application of Low Monos Polyol (폴리우레탄 폼의 미세구조와 흡음 관계 밑 Low Monos 폴리올의 응용)

  • Lee, Boo-Youn;Kim, So-Yeon;Lee, Kwang-Hee;Jin, Byung-Suk
    • Polymer(Korea)
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    • v.31 no.4
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    • pp.289-296
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    • 2007
  • The material factors influencing the sound absorption of the polyurethane foam were investigated with FT-IR, small-angle X-ray scattering (SAXS), and dynamic mechanical thermal analyzer (DMTA). The measurements were performed using the samples which had a similar cell structure but different absorption coefficients. It was found that the ability of the sound absorption of the polyurethane foams was closely related to the damping behavior over the transition range. In order to confirm the use of the low monol polyol (LMP) in high-performance applications, the polyurethanes based on LMP and polypropylene oxide polyol (PPG) were prepared by the solution polymerization method. The microstructure and the physical properties of these polyurethanes were compared. The PPG-based polyurethane showed a higher level of the phase-separated structure because the considerable amount of monol presented in PPG made a contribution to the increased chain mobility. However the short chains formed due to the monol species deteriorated the damping property. As a result, the LMP-based polyurethane showed the superior damping behavior as compared with the PPG-based one.