• Title, Summary, Keyword: PUF (Polyurethane Foam)

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Polyurethane foam-cadmium sulfide nanocomposite with open cell structure: Dye removal and antibacterial applications

  • Dorraji, Mir Saeid Seyed;Ashjari, Hamid Reza;Rasoulifard, Mohammad Hossein;Rastgouy-Houjaghan, Mehrdad
    • The Korean Journal of Chemical Engineering
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    • v.34 no.2
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    • pp.547-554
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    • 2017
  • A new way to synthesize open cell polyurethane foam using cadmium ions has been described. By converting to cadmium sulfide nanoparticles, cadmium ions have been fixed on the open cell polyurethane foam. Open cell polyurethane foam containing CdS nanoparticles (PUF-CdS) was characterized by X-Ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). The SEM results showed foam containing nanoparticles unlike pure foam (PUF) has an open cell structure. In the following, the applicability of synthesized nanocomposite in wastewater treatment was investigated. The dye removal efficiency of PUF-CdS was investigated with the objective of removing Reactive Orange 122 (RO122) as a model pollutant from aqueous solution. The effects of adsorbent dosage, initial dye concentration and initial pH of solution on RO122 removal were studied. Kinetics and equilibrium isotherms for adsorption of dye on PUF-CdS were analyzed. The maximum adsorption capacity obtained from Langmuir isotherm equation was $22.7mg\;g^{-1}$. The experimental data were adjusted to the pseudo-second-order kinetic model. The antibacterial activity of PUF-CdS was also investigated against E. coli and S. aureus.

Comparative Study on Mechanical Behavior of Low Temperature Characteristics of Polymeric Foams for Ships and Offshore Structures (폴리머 폼의 선박 및 해양구조물 적용을 위한 극저온 기계적 거동 특성 분석)

  • Park, Seong-Bo;Kim, Jeong-Hyeon;Lee, Jae-Myung
    • Journal of the Society of Naval Architects of Korea
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    • v.51 no.6
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    • pp.495-502
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    • 2014
  • Glass-reinforced polyurethane foam (R-PUF) is widely used as the primary and secondary insulation of Mark-III type liquefied natural gas (LNG) cargo system. And, polyurethane foam (PUF) and polyisocyanurate foam (PIR) are often used for insulation of onshore structures or LNG storage and pipeline system. These polymeric foam materials are known for the characteristics that mechanical properties are dependent on strain rate and temperature. In this study, compression tests for R-PUF, PIR, and PUF were carried out for the estimation of mechanical behaviors under the cryogenic environment. The range of thermal condition was from room temperature to 110K and strain rates were $10^{-3}s^{-1}$ and $10^{-4}s^{-1}$. The test results were analyzed based on the conditions of strain-rate and temperature.

Modified Gurson Model to Describe Non-linear Compressive Behaviour of Polyurethane Foam with Considering Density Effect (폴리우레탄 폼의 비선형 압축거동을 모사하기 위한 밀도 영향이 고려된 수정 Gurson 모델의 제안)

  • Lee, Jeong-Ho;Park, Seong-Bo;Kim, Seul-Kee;Bang, Chang-Seon;Lee, Jae-Myung
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.28 no.5
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    • pp.543-551
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    • 2015
  • Polyurethane Foam(PUF), a outstanding thermal insulation material, is used for various structures as being composed with other materials. These days, PUF composed with glass fiber, Reinforced PUF(R-PUF), is used for a insulation system of LNG Carrier and performs function of not only the thermal insulation but also a structural member for compressive loads like a sloshing load. As PUF is a porous material made by mixing and foaming, mechanical properties depend on volume fraction of voids which is a dominant parameter on density. Thus, In this study, density is considered as the effect parameter on mechanical properties of Polyurethane Foam, and mechanical behavior for compression of the material is described by using modified Gurson damage model.

Study on Type of Different Polyols for Physical Properties of Polyurethane Foam Under Sea Water (해수에서 폴리올 종류가 폴리우레탄 폼의 물성에 미치는 영향)

  • Kim, Sang-Bum
    • Elastomers and Composites
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    • v.46 no.2
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    • pp.158-163
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    • 2011
  • Rigid polyurethane foam (PUF) was synthesized with different contents of aliphatic polyester polyol, aromatic polyester polyol and aliphatic polyether polyol to know change of properties under sea water. UTM(universal testing machine), DSC(differential scanning calorimetry), hardness meter and FT-IR(Fourier transform spectroscopy) were used to study the PUF`s physical properties under sea water. Compressive strength and hardness of PUF decreased with increasing the content of aromatic polyester polyol under sea water as aging. According to the results of IR spectral analysis, reduction of urethane and urea peak was found and allophanate and biuret peak increased. Although glass transition temperature of PUF increased, mechanical properties of PUF decreased under sea water, because PUF gets brittle when crosslink density increase.

The Effects of Kevlar Pulp on Polyurethane Foam for Cryogenic Temperature (극저온용 폴리우레탄 폼에 미치는 케블라 펄프의 영향)

  • Oh, Jong-Ho;Bae, Jin-Ho;Lee, Jae-Myung
    • Journal of the Society of Naval Architects of Korea
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    • v.55 no.6
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    • pp.514-520
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    • 2018
  • Polyurethane foam has excellent mechanical strength and insulation performance, and has been adopted as an insulation material for $-163^{\circ}C$ liquefied natural gas carrier. In this study, Kevlar Polyurethane Foams(K-PUF) were synthesized by adding Kevlar pulp with excellent mechanical strength for the purpose of improving the performance of existing polyurethane foam. Since polyurethane foam has mechanical performance depending on the proportions of Kevlar pulp added, the mechanical strength of the K-PUF with ratios of fiber0.2wt.%, 0.4wt.%, 0.6wt.%, 0.8wt.% and 1.0wt.%) was evaluated. The compression tests were performed on the 4 different temperatures($20^{\circ}C$, $-50^{\circ}C$, $-110^{\circ}C$ and $-163^{\circ}C$) in consideration of the environmental characteristics as a cryogenic insulation used in LNG carrier. Besides, the effects of the fiber addition on polyurethane foam with closed cell structure were evaluated in a phenomenological approach through SEM analysis. All the results were compared to Neat-polyurethane foam. As a results, 0.8wt.% K-PUF showed the improved mechanical strength, and the addition of Kevlar pulp in a certain ratio improves the mechanical performance by enhancing the compression resistance.

Synthesis of Melamine Phosphate-Polyurethane Composite Foam Blown by Water and Characterization of Its Thermal Properties (H2O로 발포된 멜라민포스페이트-폴리우레탄폼 복합체 합성과 열적 특성 분석)

  • Park, Kyeong-Kyu;Lee, Sang-Ho
    • Polymer Korea
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    • v.38 no.4
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    • pp.441-448
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    • 2014
  • Polyurethane/melamine phosphate composite foam (MP-PUF) was prepared from poly(adipate)diol/melamine phosphate composite (f=2), polyether-polyol (f=4.6), and PMDI (f=2.5). The thermal properties of MP-PUF such as morphology, closed-cell content, thermal conductivity, and thermal stabilities were characterized. Water was used as a blowing agent, and the composition of melamine phosphate (MP) was maintained at $1.43{\pm}0.3wt%$ of MP-PUF. As the content of water increased, the thermal conductivity of pure polyurethane foam (PUF) decreased, whereas the thermal conductivity of MP-PUF increased. The thermal stabilities of the PUF and the MP-PUF were maximized at 5 php $H_2O$, and then decreased at the higher $H_2O$ contents. The thermal stabilities of MP-PUF were greatly enhanced due to the synergetic effect of MP and urea, which was generated during the blowing process. The temperature of 50% residual mass of MP-PUF increased to $370{\sim}450^{\circ}C$ and the temperature of 30% residual mass exceeded over $700^{\circ}C$. Compared to the PUF, the temperature of 50% residual mass and 30% residual mass were higher than 25 and $70^{\circ}C$, respectively.

Thermal Performance and Impact Resistance Evaluations of Composite Insulation Mat Reinforced Polyurethane Foam (복합 단열 매트 보강 폴리우레탄 폼의 열적 성능 및 내충격성 평가)

  • Hwang, Byeong-Kwan;Bae, Jin-Ho;Lee, Jae-Myung
    • Composites Research
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    • v.32 no.5
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    • pp.290-295
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    • 2019
  • In the present study, composite insulation mat was reinforced over polyurethane foam (PUF) to improve the thermal performance and impact resistance of the PUF applied to the liquefied natural gas carrier insulation system. The composite insulation mat used Kevlar, aerogel, and cryogel composite mat that can be applied in a cryogenic environment. The thermal conductivity was measured at $20^{\circ}C$ to investigate the thermal performance, and the drop impact test was carried out under impact energy of 30 J at $20^{\circ}C$, $-163^{\circ}C$ to investigate the impact resistance. The measured thermal performance was compared with neat PUF through effective thermal conductivity theoretical value. The shock resistance was evaluated of contact force, contact time, and absorb energy. In experimental results, cryogel composite mat was the best performance in terms of thermal performance, and aerogel composite mat was the best performance in terms of impact resistance.

Flame Retardancy of Novel Phosphorus Flame Retardant for Polyurethane Foam (새로운 인계 난연제가 연질폴리우레탄 폼의 난연성에 미치는 영향)

  • Kim, Chang Bum;Seo, Won Jin;Kwon, Oh Deok;Kim, Sang-Bum
    • Applied Chemistry for Engineering
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    • v.22 no.5
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    • pp.540-544
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    • 2011
  • Novel phosphrous flame retardant tetramethylene bis(orthophosphorylurea) (TBPU) was synthesized by the reaction of diphosphoric acid with 1,4-butanediol and urea, and charaterized by Fourier transform infrared spectroscopy (FT-IR). As the amount of TBPU added in polyurethane foam (PUF) was increased, the flame retardancy of PUF was increased and the mechanical properties were not decreased. Also, in the flame resistance test after the reduced pressure storage, the flame retardancy of TBPU added PUF was retained. We could find out that the thermal resistance of TBPU added PUF increased compared to that of pure PUF.

In Vitro Performance Assessment of a Bioartificial Liver Packed with Polyurethane Foam (다공성 폴리우레탄 충진형 생인공간의 체외 성능 평가)

  • 이두훈;이지현;김성구;박정극
    • KSBB Journal
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    • v.16 no.1
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    • pp.24-29
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    • 2001
  • Recently hepatocyte-based bioartificial liver (BAL) and hepatocyte transplantation have been actively investigated to treat acute hepatic failure. The BAL acts as a bridge to provide patients with more time until a donor organ becomes available for transplantation or until their own liver can be regenerated. In this study, we manufactured a polyurethane foam (PUF) using 15% NCO-prepolymer with a pore opening that allows it to be used as a hepatocyte immobilizing material. Cubes of PUF (3 mm dim.) were seeded with rat primary hepatocytes at a density of 5.5$\pm$1.1$\times$ $10^6$ cells/$cm^3$ PUF by centrifuging them together. The cell laden PUF cubes were packed into a prototype reactor and perfused with a hormonally defined medium for a week. Hepatocytes in the pores of the PUF formed spheroids that showed stable ammonia removal and urea synthesis activities. The albumin production level was comparable to other BAL systems. The PUF packed hepatocyte bioreactor has the potential to be used as a BAL.

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Modeling of the Temperature-Dependent and Strain Rate-Dependent Dynamic Behavior of Glass Fiber-Reinforced Polyurethane Foams (유리 섬유 강화 폴리우레탄 폼의 온도 및 변형률 속도 의존 재료 거동 모델링)

  • Lee, Dong-Ju;Shin, Sang-Beom;Kim, Myung-Hyun
    • Journal of Ocean Engineering and Technology
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    • v.33 no.6
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    • pp.547-555
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    • 2019
  • The purpose of this study was to establish a numerical model of polyurethane foam (PUF) to simulate the dynamic response and strength of membrane-type Liquefied natural gas (LNG) Cargo containment system (CCS) under the impact load. To do this, initially, the visco-plastic behavior of PUF was characterized by testing the response of the PUF to the impact loads with various strain rates as well as PUF densities at room temperature and at cryogenic conditions. A PUF material model was established using the test results of the material and the FE analysis. To verify the validation of the established material model, simulations were performed for experimental applications, e.g., the dry drop test, and the results of FEA were compared to the experimental results. Based on this comparison, it was found that the dynamic response of PUF in dry drop tests, such as the reaction force and fracture behaviors, could be simulated successfully by the material model proposed in this study.