• Elastomers and Composites
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• 제33권3호
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• pp.177-184
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• 1998

Polytetramethylene ether glycol(PTMG)와 4,4'-diphenylmethane diisocyanate(MDI), tol-uene 2,4-diisocyanate (TDI), isophoron diisocyanate(IPDI)로 polyurethane(PU) prepolymer를 합성, n-methyl-diethanol amine(n-MDEA)로 쇄연장시킨 후 glycolic acid(GA)로 quaternization시켜서 안정한 수분산성의 양이온성 폴리우레탄을 제조하였다. 양이온성 폴리우레탄의 합성과정에서 쇄연장제의 함량과 quaternization에 따른 에멀젼의 유화안정성, 접착강도, 점도, 유리전이온도 및 cast film의 물리적 성질을 UTM, Viscometer와 DSC를 사용하여 검토하였다.

• Elastomers and Composites
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• 제33권3호
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• pp.149-158
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• 1998

폴리초산비닐 에멀젼 수지에 SBR 라텍스, 폴리우레탄 라텍스, 에폭시 라텍스를 각각 혼합하여 물리적 특성 및 기계적 특성을 조사하였다. 에폭시 수지의 상용성은 양호하였으며 건조도막은 투명하였다. 폴리우레탄과 SBR은 높은 점도를 나타내었으며 건조도막은 불투명하였다. SBR과 폴리우레탄 수지에서 경도의 증가는 물의 증발속도에 의존하였지만 에폭시 수지에서는 가교밀도의 증가에 의존하였다. 에폭시 수지는 매우 뛰어난 내수성을 나타내었다. SBR은 높은 굴곡강도와 충격강도를 나타내었다. 폴리초산비닐에 라텍스를 10% 이내로 혼합하였을 때에는 연성파괴를 나타내었고 20% 이상 혼합하였을 때에는 취성파괴를 나타내었다.

• 한국염색가공학회지
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• 제22권1호
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• pp.43-50
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• 2010

The thermal treatment for carbon nanotube was applied to remove the water, metal catalyst and other impurities in carbon nanotube. The surface of carbon nanotube was changed into open structure with acid treatment by mixed solution of $HNO_3$ and $H_2SO_4$. The dispersion property of the functionalized and modified carbon nanotube was assessed with naked eyes by dispersing it in DMF. Carbon nanotube mixd polyurethane film was made to estimate the dispersion property by reflectance of the film with UV-Vis spectrometer. Also the internal structure of carbon nanotube was observed with SEM and TEM and thermal pyrolysis property of the carbon nanotube was measured by TGA and DSC. The surface modification of carbon nanotube by thermal and acid treatments improved the dispersion property of carbon nanotube/polyurethane mixed materials.

• 공업화학
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• 제3권4호
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• pp.614-619
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• 1992

Soft segment가 각각 ester 및 ether형 polyol로된 2종의 polyurethane(PU) ionomer를 emulsion 블렌딩하여, 블렌드의 분산점도, 및 emulsion cast film의 접촉각, 기계적 특성을 조성의 함수로 측정하였다. 블렌드의 기계물성은 혼합법칙으로부터 심한 scattering이나, negative deviation을 보였으며, 이는 ester 및 ether형 polyol간의 상용성의 결여에 기인하는 것으로 보았다. 접촉각 측정 결과로부터 유화입경이 작은 PPG PU 입자가 주로 도막표면층을 형성하는 것을 확인할 수 있었다.

• 한국응용과학기술학회지
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• 제35권4호
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• pp.1224-1229
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• 2018

In this study, 2-hedroxyethyl methacrylate (2-HEMA) was graft synthesized on water-dispersed polyurethane using polytetramethylene ether glycoll (PTMG), and then the film of resin was prepared and the physical properties of polyurethane resin were measured. The mechanical properties of the synthesized polyurethane resin were measured by using FT-IR, UTM, adhesion performance measuring instrument. As a result of tensile strength measurement, the tensile strength of HPUD4 with high 2-HEMA content was increased to $5.05kgf/mm^2$, the elongation was measured as 285% of the HPUD1 sample not containing 2-HEMA and adhesive strength of HPUD4 sample was measured at 9.1 sec to 635 psi.

• International Journal of Industrial Entomology and Biomaterials
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• 제5권2호
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• pp.163-170
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• 2002

In this paper, silk fibroin (SF)/polyurethane (PU) blend films were fabricated to develop a new biomaterial for biomedical applications. These blend films were prepared using formic acid as a cosolvent, and structural characteristics and properties of blend films were investigated. FTIR results suggested that there was no specific interaction between SF and PU, implying molecular immiscibility in SF/PU blend films. Furthermore, it was revealed by XRD method that the crystalline region of blend components was not perturbed by counterpart polymers. The degree of phase separation of SF/PU blend films was diminished by increasing PU content in blend. Especially, the blend with 70% content of PU showed no evidence of macro-phase separation in SEM observation. However, SF/PU blend (70/30) was revealed to be phase-separated in a lower dimension confirmed by DMTA measurement. TGA result showed that thermal decomposition temperature of blend film was slightly decreased compared to those of SF and PU polymer itself, Though mechanical properties of SF/PU blend films were not good enough due to the solvent, blood compatibility of PU can be enhanced markedly by mixing with SF for SF/PU blend film.

• 폴리머
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• 제31권2호
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• pp.111-116
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• 2007

폴리우레탄 변형 아크릴레이트(PUA)/실리카 하이브리드 필름은 자외선 경화에 의해 제조되었고, 필름의 표면물성은 경도시험과 접착력 테스트를 통해 분석되었다. 이들 필름은 유기, 무기함량을 mole비로 조성하여 실험하였으며, 무기조성은 실리카 입자의 함량을 기준으로 설정하였다. 필름 층 내의 실리카 입자는 함량에 따라 혹은 분산정도에 따라 내스크래치성이나 필름자체 경도 등의 물성이 많은 차이를 보였는데, 이는 PUA필름 층 내의 실리카 입자들이 균일하게 분포되어 가교결합되어 있었기 때문이다.

• 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.

• 한국염색가공학회지
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• 제34권3호
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• pp.173-184
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• 2022

In this study, the TPU film was laminated on an aramid fabric or circular knits in order to implement an air cushion material that can respond to high impact forces in case of a fall and is easy to expand. To increase the bonding strength between the fabric layer and the film layer, a primer layer was formed in two ways: one for thermally bonding and laminating PET film and two for coating and aging hot melt type PUR adhesive. The tensile strength of the aramid air cushion was 2.5 times higher than that of the circular knits, but the tensile elongation of the aramid air cushion was very low compared to that of the circular knits. The tear strength of the aramid air cushion was about twice or more superior to that of the circular knits, the primer treatment method was good at A, and the peel strength was excellent at method A. The aramid air cushion was the lightest in weight. Summarizing the above results, it was best to combine the air cushion material with aramid woven fabric and primer treatment method A to cope with the high impact force applied when falling.

• 한국염색가공학회지
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• 제22권3호
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• pp.246-256
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• 2010

This study studies on the physical property of MWNT/PU composite film for electrostatic dissipation (ESD) function by dispersing multi-wall carbon nanotubes (MWNT) in dimethylformamide (DMF) and by combining it with polyurethane(PU). For this purpose, four kinds of MWNT were selected and the composite films were made by dispersion processing, and their physical properties were measured and investigated in terms of electrical conductivity. For dispersion parameters, four MWNT contents(0.5, 1, 2, 5wt%) and two dispersion times(30min, 120min) were selected. The dispersion property and the electrical conductivity of MWNT/PU film was measured using a UV-Vis spectrometer and conductivity measuring apparatus. Finally, their physical properties according to the dispersion conditions were analyzed and discussed with various processing conditions.