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다중 자극 형상기억특성을 갖는 UV경화형 아크릴레이트/그레펜 나노복합체 제조

Title
다중 자극 형상기억특성을 갖는 UV경화형 아크릴레이트/그레펜 나노복합체 제조
Author
김성진
Advisor(s)
장영욱
Issue Date
2017-02
Publisher
한양대학교
Degree
Master
Abstract
Network polymer nanocomposites with thermal, water, and photo responsive shape memory effects were prepared by UV curing of a mixture of aliphatic urethane diacrylate oligomer (PUDA), N-vinyl-2-pyrrolidone (NVP) and small amount of acrylate functionalized graphene oxide (A-GO). Dynamic mechanical analysis of UV cured network based on PUDA/NVP mixture with NVP content of 10, 20, and 30 wt% showed a single Tg, implying that a homogeneous network was formed, and the Tg increased with increasing NVP content. The UV cured PUDA/NVP blend networks exhibit excellent thermally-responsive shape memory effect when the temporarily deformed shape was heated above their Tg. Water-responsive shape memory effect was also observed in the UV cured PUDA/NVP blend networks. Temporarily deformed shape was recovered to original shape when it was immersed in water at room temperature, and the water-responsive shape recovery rate increased with increasing NVP content in the PUDA/NVP mixture. The water-responsive shape memory effect was attributed to increasing mobility of the co-network by plasticizing effect of the absorbed water. Thermomechanical properties and shape memory effects of UV cured nanocomposites based on PUDA/NVP (80/20) blend with small amount of A-GO were investigated. Nanocomposites exhibited faster thermally-responsive shape recovery rate compared to unfilled network, and the speed was increased with increasing A-GO content, which was attributed to the enhanced degree of crosslinking of the network and increased stored strain energy. Speed for the water-responsive shape recovery depends upon the A-GO content, which are associated with the combined effect of stored strain energy and water absorption rate. The nanocomposite exhibited shape memory behavior when it is irradiated under near infrared (NIR) light indicating that A-GO acted as NIR triggered nanoheaters.
URI
http://dcollection.hanyang.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000099153https://repository.hanyang.ac.kr/handle/20.500.11754/124563
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > FUSION CHEMICAL ENGINEERING(융합화학공학과) > Theses (Master)
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