• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2008년도 제39차 학술발표회
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• pp.45-46
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• 2008

Dyeing and fastness properties of acid dyeable polyurethane have been compared with those of regular polyurethane. The Exhaustion and color strength on acid dyeable polyurethane was relatively better than regular polyurethane at heavy depth dyeing. The washing fastness properties of acid dyes on acid dyeable polyurethane were similar to those of regular polyurethane.

• Elastomers and Composites
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• 제48권3호
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• pp.241-248
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• 2013

polyester형 polyurethane foam은 낮은 내가수분해성을 가지므로 quasi prepolymer법에 의한 acrylic polyol을 사용함으로써 극복될 수 있다. acrylic polyol을 함유한 polyurethane foam은 acrylic polyol 함량이 증가함에 따라 인장강도와 경도가 증가하였다. 하지만 split 인열강도와 인열강도는 약간씩 변화되었다. polyurethane foam의 내가수분해성은 인장강도의 손실 백분율로 측정하였으며 acrylic polyol 함량이 25.5g에서 102g으로 증가함에 따라 향상되었다.

• Macromolecular Research
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• 제9권6호
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• pp.332-338
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• 2001

Waterborne polyurethane as a new polymer electrolyte was synthesized by using relatively hydrophilic polyols. The morphology of polyurethane was changed as it was dispersed in water. In contrast to polyurethane ionomer, waterborne polyurethane did not form an ionic cluster but produced a binary system composed of hydrophilic and hydrophobic groups. In the colloidal system, the former and the latter existed at outward and inward, respectively. Waterborne polyurethane was prepared from poly(ethylene glycol) (PEG) /poly(propylene glycol) (PPG) copolymer, 4,4'-diphenylmethane diisocyanate(MDI), ethylene diamine as a chain extender, and three ionization agents, 1,3-propane sultone, sodium hydride and lithium hydroxide. PEG/PPG copolymer was used for suppressing the crystallinity of PEG and N-H bond was ionized for increasing the electrochemical stability of polyurethane. Low molecular weight poly(ethylene glycol) and poly(ethylene glycol dimethyl ether) (PEGDME) were used as plasticizers. DSC, FT-IR and $^1$H-NMR of the waterborne polyurethane were measured. Also, the ionic conductivity of solid polymer electrolytes based on waterborne polyurethane and various concentrations of low molecular weight poly(ethylene glycol) or PEGDME were measured by AC impedance.

• Korean Chemical Engineering Research
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• 제48권5호
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• pp.561-567
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• 2010

Isophrone diisocyanate, poly(tetramethylene glycol)과 dimethylol propionic acid로부터 제조된, polyurethane 부분중합체의 미반응 NCO기를 aminopropyl triethoxysilane으로 capping시켜 silylated waterborne polyurethane을 합성하였다. 연이어 이것을 colloidal silica와 혼합하여 silylated waterborne polyurethane/silica nanocomposite를 제조하였다. 동적빛 산란법에 의해 측정된 nanocomposite 입자의 평균 크기는 silica 함유량과 무관하게 거의 일정한 수치를 나타내었다. 그러나 제조된 nanocomposite의 열적안정성은 순수한 waterborne polyurethane보다 우수하였다.

• Corrosion Science and Technology
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• 제13권5호
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• pp.170-177
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• 2014

Polyurethane coating was designed to give a hydrophobic property on its surface by modifying it with hydroxyl terminated polydimethylsiloxane and then effects of surface hydrophobic tendency, water transport behavior and hence corrosion protectiveness of the modified polyurethane coating were examined using FT-IR/ATR spectroscopy, contact angle measurement and electrochemical impedance test. As results, the surface of polyurethane coating was changed from hydrophilic to hydrophobic property due primarily to a phase separation tendency between polyurethane and modifier by the modification. The phase separation tendency is more appreciable when modified by polydimethylsiloxane with higher content. Water transport behavior of the modified polyurethane coating decreased more in that with higher hydrophobic surface property. The decrease in the impedance modulus ${\mid}Z{\mid}$ at low frequency region in immersion test for polyurethane coatings was associated with the water transport behavior and surface hydrophobic properties of modified polyurethane coatings. The corrosion protectiveness of the modified polyurethane coated carbon steel generally increased with an increase in the modifier content, confirming that corrosion protectiveness of the modified polyurethane coating is well agreed with its water transport behavior.

• 동력기계공학회지
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• 제18권5호
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• pp.106-114
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• 2014

For the purpose of development of polyurethane sealing material, polyurethane resins reinforced with CuO were prepared from polyol and MOAC(4,4'-Methylenebis(2-chlorobenzeneamine)). And the effects of compositions on the mechanical properties of the reinforced polyurethane resin were experimentally examined. The polyurethane resin got to be thermally decomposed at $260^{\circ}C$ and completely carbonized around $500^{\circ}C$. Tensile strength, elongation and hardness of the polyurethane resin increased with the content of MOCA. CuO was uniformly dispersed in the polyurethane resin by 1 minute's ultrasonic radiation. Tensile strength, elongation and hardness of the polyurethane resin reinforced with CuO increased with the content of CuO. Tensile strength and hardness of the reinforced polyurethane resin increased with particle size of the CuO, but elongation decreased. CuO showed higher tensile strength and hardness than any other additives, and lowest elongation.

• 한국화재소방학회논문지
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• 제20권4호
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• pp.110-115
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• 2006

폴리우레탄에 인계 화합물을 첨가하여 폴리우레탄폼을 제조하였으며, 인계 화합물이 제조된 폴리우레탄폼의 기계적 물성과 난연성에 미치는 영향에 대하여 고찰하였다. 폴리우레탄과 인계 난연제인 Tri(chloroisopropyl) phosphate(TCPP), Triethyl phosphate(TEP), Trimethyl phosphate(TMP) 각각을 약 $90^{\circ}C$에서 혼합시켜 혼합물로부터 제조된 경질 폴리우레탄폼에 대한 여러 실험을 통하여 기계적 물성뿐만 아니라 난연 효과도 상당히 향상됨을 확인하였다. Cone calorimeter를 이용하여 열방출율(heat release rate, HRR)을 측정하여 난연 첨가제의 함량에 따른 재료별 난연 특성을 평가하였다. 그리고 Scanning Electron Microscope(SEM)을 사용하여 난연제를 첨가하여 만든 폴리우레탄폼의 morphology를 관찰한 결과 순수한 폼과 마찬가지로 매우 균일한 형태의 cell 분포를 가짐을 확인하였다.

• 한국응용과학기술학회지
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• 제24권2호
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• pp.182-189
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• 2007

Used polyurethane was chemically degraded by treatments with flame retardants such as tris(3-chloropropyl) phosphate (TCPP), triethyl phosphate (TEP), and trimethyl phosphate (TMP). The structure of degraded products (DEP) was analyzed by FT-IR and P-NMR and it turned out to be phosphorus containing oligourethanes. Rigid polyurethane foam was produced by using the degraded products (DEP) as flame retardants. The flammability of recycled rigid polyurethane was investigated. The recycled polyurethane shows a reduced flammability over virgin polyurethane. In order to evaluate flame retardant properties of the recycled polyurethane foams with various amounts of DEP, the combustion parameters of the foam was measured by a cone calorimeter. Scanning electron micrograph of recycled PU shows the same uniform cell morphology as virgin PU.

• 접착 및 계면
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• 제10권4호
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• pp.169-173
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• 2009

본 연구에서는 폴리우레탄 엘라스토머 합성 시 사용되는 폴리올, 사슬 연장제, 이소시아네이트에 따른 물성 변화를 알아보았다. 폴리우레탄 엘라스토머 합성시 poly(tetramethylene) glycol을 사용하였을 경우가 인라인 스케이트 휠의 요구물성을 만족하였다. 사슬 연장제의 함량이 증가함에 따라 인장강도와 경도는 증가하였으나, 신율은 감소하는 경향을 나타내었다. 또한 방향족 이소시아네이트의 종류에 따른 평가 결과 bulky한 구조보다는 상대적으로 유연한 구조를 가지고 있는 이소시아네이트가 우수한 물성을 나타내었다.

• Korean Chemical Engineering Research
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• 제50권2호
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• pp.191-197
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• 2012

Isophorone diisocyanate(IPDI), polycarbonate diol(PCD), dimethylol propionic acid(DMPA)를 출발물질로 하여 제조된 폴리우레탄 prepolymer의 미반응 NCO기를 아크릴 단량체인 pentaerythritol triacrylate(PETA)로 capping시켜 acrylic terminated polyurethane prepolymer를 합성하였다. 그 후 이 prepolymer의 잔여 NCO기를 실란커플링제인 aminopropyl triethoxysilane(APS) 또는 glycidoxypropyl trimethoxysilane(GPTMS)와 반응시켜 silylated acrylic terminated waterborne polyurethane을 제조하였다. 동적 빛 산란법에 의해 측정된 순수한 수분산 폴리우레탄의 평균 직경은 PETA와 APS가 첨가됨에 따라 14.3 nm에서 208.6 nm로 크게 증가하였다. 또한 silylated acrylic terminated waterborne polyurethane 코팅 도막의 연필경도 및 내마모성은 순수한 수분산 폴리우레탄보다 우수하였다.