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Core-Sheath Polyurethane-Carbon Nanotube Nanofibers Prepared by Electrospinning
Rana, Sravendra,Cho, Jae-Whan 한국섬유공학회 2011 FIBERS AND POLYMERS Vol.12 No.6
The core-sheath nanofibers consisting of polyurethane (PU) core and PU composites sheath with multi-walled carbon nanotubes (MWNTs) were prepared by electrospinning. At low MWNT concentration, MWNTs appeared highly aligned along the fiber axis with some curving in nanotubes, whereas in case of high concentration, some aggregation of MWNTs appeared due to difficulty in full dispersion of nanotubes. In comparison of the single component nanofiber webs, the core-sheath nanofiber webs showed much better mechanical properties of modulus and breaking stress, including an exceptional elongation-at-break. It indicates that the CNT-incorporated core-sheath structure is very effective for enhancing the mechanical properties of nanofiber webs. In addition, the core-sheath nanofibers demonstrated the fast shape recovery, compared with one component fibers of pure shape memory PU and PU/MWNTs, which provides the possibility of fabricating more sensitive intelligent materials.
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( Yeon Su Bae ),( In Chul Um ) 한국잠사학회 2016 International Journal of Industrial Entomology Vol.33 No.2
Silk has been used extensively in textile applications because of its good luster and feel. However, the low elongation and elastic recovery of silk has limited its use in a wider variety of textile applications. In this study, silk textile samples were made with a highly twisted silk/polyurethane core-spun yarn. They were immersed in water and dried at different temperatures, and the effect of treatment temperature on the mechanical properties of the silk textile was examined. It was found that the water temperature strongly affected the morphology and mechanical properties of the silk textile, whereas the drying temperature did not. As the water temperature was increased, the weft silk yarn became tangled and the interval between warp yarns decreased, resulting in shrinkage of the silk textile. When the silk textile was immersed in water at high temperature (i.e., 100°C), the elongation of the textile increased eight-fold as compared to an untreated silk textile. The maximum elastic recovery ratio of the silk textile was 96.7%.
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김승수,이재훈,류 훈,임가현,임준섭,이치완,이춘규 한국고분자학회 2022 폴리머 Vol.46 No.5
Herein we prepared an adhesive for laminated electrical steels that has excellent adhesion and oil resistancefor dot-bonded motor core for electric vehicles. Its outstanding adhesion and oil resistance originate from isosorbide corestructure having good hydrophilicity and a rigid chemical structure. The adhesion property was evaluated by measuringthe lap shear strength of the laminated electrical steel and peel strength of the dot-bonded motor core and compared itto an adhesive to which petroleum-based alicyclic polyol was applied. Isosorbide derivative was incorporated in acrylatemodified polyurethane as a polyol for compatibility with other adhesive components and to enact a fast-curing process.
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스판덱스 코어 나일론 커버링 two way 복합사 직물의 전단특성
李春吉 慶一大學校 2002 論文集 Vol.18 No.-
The two way fabrics woven by spandex-core nylon-covering complex yarn play a decisive role in producing the high quality textile garments. The fabrics used in this experiments, woven by polyurethane 40 denier core filament and nylon 140 denier/ 48 filaments covering yarn, were wet and dry heat treated two way fabrics. We performed the experiments to know the influence of treatment time and temperature on the shear properties of the two way fabrics. In wet treatment, the samples were made by using the two way fabric at boiling temperature through the treatment time of 2, 4, 6, 8, 10 min. respectively. In dry treatment, the samples were made at the temperature of 100, 120, 140, 160℃ for 2, 6, 10, 20 min. respectively. The shear properties of the samples were evaluated by using Kawabata Hand Evaluation System. Through the experiments the following results were obtained. The shear stiffness of the wet treated samples increased according to the treatment time and the shear stiffness of the dry treated samples decreased at the treatment temperature of 160℃ according to the treatment time. The hysteresis of shear force at the shear angle φ=0.5° of the wet treated samples decreased and the hysteresis of shear force at the shear angle φ=0.5° of the dry treated samples decreased at the treatment temperature of 160℃ according to the treatment time. The hysteresis of shear force at the shear angle φ=5°of the wet treated samples had almost the same values but the hysteresis of shear force at the shear angle φ=5°of the dry treated samples decreased over the treatment temperature of 120℃ according to treatment time.
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이소시아네이트를 포함하는 Microcapsule을 사용한 접착수지의 특성에 관한 연구
김동호 ( Dong Ho Kim ),김구니 ( Gu Ni Kim ) 한국접착및계면학회 2014 접착 및 계면 Vol.15 No.3
본 연구에서는 내부에 이소시아네이트를 포함하는 microcapsule을 합성하였으며, 제조된 microcapsule에 대한 분석 및 폴리우레탄 수지와 병용했을 때의 기계적 물성과 접착특성에 대해서 고찰하였다. 전자현미경을 사용해서 합성된 microcapsule이 구형의 외관을 갖는 것을 확인하였으며, FT-IR과 TGA 분석을 통해서 microcapsule의 core 물질이 IPDI인 것과 각 구성요소들의 성분비를 확인하였다. 폴리우레탄 수지 자체 및 microcapsule을 포함한 경우의 접착력 및 물성을 평가한 결과 접착수지 내에 포함된 microcapsule 내 IPDI의 가교반응에 의해서 폴리우레탄 수지 자체에 비해 접착력, 인장강도, 내마모 특성이 크게 향상되는 것을 확인하였다. In this study, we synthesized and identified microcapsule containing isocyanate, and investigated the mechanical and adhesion properties of polyurethane resin by adding microcapsule. We found out that the core material of microcapsule and the component weight fraction of microcapsule from the FT-IR and TGA analysis. From the results of adhesion and mechanical property tests, we confirmed that in case of using microcapsule for adhesive resin composition, adhesion strength, tensile strength and abrasion were improved by cross-linking reaction between urethane and IPDI in microcapsule.
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