정현승 류수연 김영남 하유미 Chetna Tewari 김성륜 김정규 Jung, Yong Chae 2024-01-12T02:35:13Z 2024-01-12T02:35:13Z 2022-11-28 2022-11 1996-1944 https://pubs.kist.re.kr/handle/201004/75930 In this study, high-crystallinity single walled carbon nanotubes (H-SWNTs) were prepared by high-temperature thermal annealing at 1800 degrees C and a self-heating shape memory polyurethane nanocomposite with excellent self-heating characteristics was developed within a few seconds by irradiation with near-infrared rays. With a simple method (heat treatment), impurities at the surface of H-SWNTs were removed and at the same time the amorphous structure converted into a crystalline structure, improving crystallinity. Therefore, high conductivity (electric, thermal) and interfacial affinity with PU were increased, resulting in improved mechanical, thermal and electric properties. The electrical conductivity of neat polyurethane was enhanced from similar to 10(-11) S/cm to 4.72 x 10(-8) S/cm, 1.07 x 10(-6) and 4.66 x 10(-6) S/cm, while the thermal conductivity was enhanced up to 60% from 0.21 W/mK, 0.265 W/mK and 0.338 W/mK for the composites of 1, 3 and 5 wt%, respectively. Further, to achieve an effective photothermal effect, H-SWNTs were selected as nanofillers to reduce energy loss while increasing light-absorption efficiency. Thereafter, near-infrared rays of 818 nm were directly irradiated onto the nanocomposite film to induce photothermal properties arising from the local surface plasmon resonance effect on the CNT surface. A self-heating shape memory composite material that rapidly heated to 270 degrees C within 1 min was developed, even when only 3 wt.% of H-SWNTs were added. The results of this study can be used to guide the development of heat-generating coating materials and de-icing materials for the wing and body structures of automobiles or airplanes, depending on the molding method. English MDPI Open Access Publishing Easy, Fast Self-heating Polyurethane Nanocomposite with the introduction of Thermally Annealed Carbon Nanotubes using Near-Infrared Lased Irradiation Article 10.3390/ma15238463 1 Materials, v.15, no.23, pp.8463 Materials 15 23 8463 Y scie scopus 000897344300001 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Physics, Applied Physics, Condensed Matter Chemistry Materials Science Metallurgy & Metallurgical Engineering Physics Article ELECTRONIC-PROPERTIES RAMAN CHARACTERIZATION MECHANICAL-PROPERTIES PURIFICATION Polyurethane (PU) thermal annealed carbon nanotube photothermal effect Near-infrared radiation (NIR)