• Title, Summary, Keyword: polyurethane

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Synthesis and Characterization of Polyurethane Elastomer (Polyurethane Elastomer의 합성 및 특성)

  • Jeong, Booyoung;Cheon, Jungmi;Chun, Jeahwan;Mok, Dongyoub;Lee, Hakmung
    • Journal of Adhesion and Interface
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    • v.10 no.4
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    • pp.169-173
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    • 2009
  • In this study, We were studied on the properties of polyurethane elastomer containing the polyol, chain extender and isocyanate in polyurethane elastomer. Polyurethane elastomer had the best properties with poly(tetramethylene) glycol for in-line skate wheel. With more incorporation of chain extender content in polyurethane elastomer, tensile strength and hardness increased and elongation decreased. And then properties of polyurethane elastomer with the bulky type isocyanate had better than the flexible type isocyanate.

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Effect of Addition of Pentaerythritol Triacrylate and Silane Coupling Agents on the Properties of Waterborne Polyurethane (Pentaerythritol Triacrylate와 실란커플링제의 첨가가 수분산 폴리우레탄의 물성에 미치는 영향)

  • Shin, Yong Tak;Hong, Min Gi;Kim, Byung Suk;Lee, Won Ki;Yoo, Byung Won;Lee, Myung Goo;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.50 no.2
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    • pp.191-197
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    • 2012
  • Acrylic terminated polyurethane prepolymers were synthesized by capping the NCO groups of polyurethane prepolymers, prepared from isophorone diisocyanate (IPDI), polycarbonate diol (PCD) and dimethylol propionic acid (DMPA), with pentaerythritol triacrylate (PETA). Subsequently, silylated acrylic terminated prepolymers were prepared by capping the NCO groups of acrylic terminated polyurethane prepolymers with different types of silane coupling agents, glycidoxypropyl trimethoxysilane (GPTMS) or aminopropyl triethoxysilane (APS). The average particle size of pure waterborne polyurethane solution, measured by the dynamic light scattering method, was increased from 14.3 nm to 208.6 nm by adding PETA and APS. Also, the coating film of silylated acrylic terminated waterborne polyurethane showed better abrasion resistance and pencil hardness than that of pure waterborne polyurethane.

A Study on the Synthesis and Curing Characteristics of PPG-type Polyurethane Methacrylates (PPG계 Polyurenthane Methacrylates의 합성과 경화특성)

  • Kim, Ju-Young;Suh, Kung-Do
    • Applied Chemistry for Engineering
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    • v.3 no.4
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    • pp.627-638
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    • 1992
  • PPG and BPA-type polyurethane prepolymers(NCO terminated) were obtained from bisphenol A and four types of PPG, having different molecular weight and numbers of functional groups. PPG and BPA-type polyurethane dimethacrylates were synthesized by reacting PPG and BPA-type polurethane prepolymer with 2-HEMA respectively. PPG-type polyurethane dimethacrylates were formulated with initiator(CHP), inhibitor(hydroquinone) and reactive diluent(TEGDMA). The effect of formulation on the torque changes was studied. Four kinds of PPG-type polyurethane dimethacrylates, having different molecular weight and numbers of functional group, were formulated with the same amount of CHP, TEGDMA and hydroquinone. The effects of the molecular weight of PPG-type polyurethane dimethacrylate and functional group numbers of PPG-type polyurethane dimethacrylates on the torque were investigated. These results showed that the torque of PPG-type polyurethane dimethacrylates, having same numbers of functional group, increased with decreasing molecular weight of dimethacrylates and torque of PPG-type polyurethane dimethacrylate, having similar molecular weight, was increased with increasing the number of fuctional group. The glass-transition temperature(Tg) of gels obtained by thermosetting cure for the four kinds of PPG-type polyurethane dimethacrylates were measured by DSC and molecular weights between cross-links(Mc) were calculated from Tg changes.

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Development and Application of Conducting Shape Memory Polyurethane Actuators (전도성 형상 기억 폴리우레탄 작동기의 개발 및 응용)

  • Paik, Il-Hyun;Jung, Yong-Chae;Cho, Jae-Hwan;Goo, Nam-Seo
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.226-230
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    • 2005
  • This paper presents the actuation performance of a conducting shape memory polyurethane (CSMPU) actuator. We introduced a concept of shape memory polyurethane activated by electric power while conventional shape memory polyurethanes are activated by external heat source. A conducting shape memory polyurethane actuator was manufactured by adding cabon nano-tube to conventional shape memory polyurethane. The main problem of the previous CSMPU was bad dispersion of carbon nano-tubes in polyurethane. In this paper, we have tried to find manufacturing method to solve the dispersion problem. With a lot of elaborative works, we have developed conducting shape memory polyurethane actuator with good electrical performance. The actuation performance of the developed conducting shape memory polyurethane actuator was measured and assessed.

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Effect of Polyethylene Glycol Molecular Weight and NCO Index on Properties of the Hydrophilic Reactive Hotmelt Polyurethane Adhesives (Polyethylene Glycol의 분자량 및 NCO index의 변화에 따른 Hydrophilic Reactive Hotmelt Polyurethane의 물성 변화)

  • Han, Young Chul;Kim, Dack Han;Oh, Kyung Seok;Shin, Hyeon Jeong;Yang, Jeong Han;Jeong, Han Mo
    • Textile Coloration and Finishing
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    • v.30 no.2
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    • pp.90-97
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    • 2018
  • Hydrophilic reactive hot-melt polyurethane adhesive(HRHA) using a hydrophilic polyol having different molecular weight and NCO index was synthesized. This HRHA was synthesized using Polyethylene glycol(PEG) as a hydrophilic polyol, Polypropylene glycol(PPG) and Polycaprolactone diol(PCL) as hydrophobic polyols, and Methylene diphenyl diisocyanate(MDI) as an isocyanate. The changes in IR spectrum, viscosity and thermal properties of HRHA with different PEG molecular weights and NCO index were investigated, and the tensile strength and elongation of the HRHA casting film and the peel strength, moisture permeability and water pressure of the HRHA coated fabric were confirmed. In this experiment, as the molecular weight of PEG and NCO index increased, the adhesive strength, tensile strength, elongation and moisture permeability was increased but viscosity and Tg was decreased.

Polyurethane-Coated Breast Implants Revisited: A 30-Year Follow-Up

  • Castel, Nikki;Soon-Sutton, Taylor;Deptula, Peter;Flaherty, Anna;Parsa, Fereydoun Don
    • Archives of Plastic Surgery
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    • v.42 no.2
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    • pp.186-193
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    • 2015
  • Background Polyurethane coating of breast implants has been shown to reduce capsular contracture in short-term follow-up studies. This 30-year study is the longest examination of the use of polyurethane-coated implants and their correlation with capsular contracture. Methods This study evaluates the senior surgeon's (F.D.P.) experience with the use of polyurethane-coated implants in aesthetic breast augmentation in 382 patients over 30 years. Follow-up evaluations were conducted for six months after surgery. After the six-month follow-up period, 76 patients returned for reoperation. The gross findings, histology, and associated capsular contracture were noted at the time of explantation. Results No patient during the six-month follow-up period demonstrated capsular contracture. For those who underwent reoperation for capsular contracture, Baker II/III contractures were noted nine to 10 years after surgery and Baker IV contractures were noted 12 to 21 years after surgery. None of the explanted implants had macroscopic evidence of polyurethane, which was only found during the first five years after surgery. The microscopic presence of polyurethane was noted in all capsules up to 30 years after the original operation. Conclusions An inverse correlation was found between the amount of polyurethane coating on the implant and the occurrence of capsular contracture. Increasingly severe capsular contracture was associated with a decreased amount of polyurethane coating on the surface of the implants. No contracture occurred in patients whose implants showed incomplete biodegradation of polyurethane, as indicated by the visible presence of polyurethane coating. We recommend research to find a non-toxic, non-biodegradable synthetic material as an alternative to polyurethane.

Preparation of Silylated Acrylic Polyurethane Dispersion Using Aminopropyl Triethoxysilane and Acrylate Monomers (Aminopropyl Triethoxysilane과 아크릴 단량체를 이용한 Silylated Acrylic Polyurethane Dispersion의 제조)

  • Kim, Byung Suk;Yun, Dong Gu;Yoo, Byung Won;Lee, Myung Goo;Byun, Tae Gang;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.50 no.4
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    • pp.639-645
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    • 2012
  • Waterborne polyurethane dispersion (PUD) was synthesized by capping the NCO groups of polyurethane prepolymers, prepared from isophorone diisocyanate, polycarbonate diol and dimethylol propionic acid, with aminopropyl triethoxysilane (APS). Subsequently, silylated acrylic polyurethane dispersion was synthesized by reacting the PUD with the mixture of acrylate monomers, 2-hydroxyethyl methacrylate and methyl methacrylate. The average particle size of silylated acrylic polyurethane dispersion, measured by the dynamic light scattering method, was increased from 39.0 nm to 399.8 nm by increasing the addition amounts of APS. Also, the pencil hardness of coating films of silylated acrylic polyurethane dispersion was enhanced from B grade to F grade with increasing APS content.

Damping Characteristics of Polyurethane Composites Incorporating Recycled Rubber Particles and Aggregates (폐타이어 고무분말과 골재를 혼입한 폴리우레탄 복합재료의 감쇠 특성)

  • Park, Se Eon;Choi, Jeong-Il;Hwang, Jae-Seung;Lee, Bang Yeon
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.8 no.3
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    • pp.263-268
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    • 2020
  • The purpose of this study is to investigate the damping properties of polyurethane composites incorporating waste tire rubber powder and preplaced coarse aggregates. Four types of polyurethane-based composites were manufactured, and longitudinal impact tests were performed. And vibration signals in the time domain and frequency domain were measured and values of damping ratio for each specimen were calculated. Test results showed that the damping ratios of polyurethane composites, in which the amount of polyurethane was reduced by 10.6% and 21.2% through incorporation of rubber particles, were 8.4% and 4.6% lower than that of pure polyurethane. The damping ratio of the polyurethane composite produced in a similar manner to the prepact concrete production method was found to be 22% lower than that of pure polyurethane, however, the amount of polyurethane was reduced by 50% and the stiffness was 25.7 times higher than that of pure polyurethane.

The Properties of Commercial Polyurethane Coated Fabrics (시판되는 폴리우레탄 코팅포의 물성)

  • 이정순;신혜원
    • Journal of the Korean Society of Clothing and Textiles
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    • v.21 no.8
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    • pp.1346-1352
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    • 1997
  • The purpose of this study was to help the consumer as well as the producer by investigating the properties such as tensile strength, extention, tear strength, wrinkle recovery, drapability, bending property, moisture regain, and shrinkage on commercial polyurethane coated fabrics. Seven commercial polyurethane coated fabrics having various base fabrics were used. The performance properties of base fabrics and polyurethane coated fabrics were measured. The relationships between base fabrics and polyurethane coated fabrics on the performance properties were identified. It was concluded that the properties of polyurethane coated fabric mainly depend on the characteristics of base fabric. Therefore the proper use of base fabric is recommended in order to improve the performance of polyurethane coated fabric.

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