Effect of polybenzimidazole (PBI) film coating on hypervelocity impact resistance for space applications = 우주환경적용을 위한 폴리벤즈이미다졸(PBI) 필름이 초고속 내충격에 미치는 영향에 관한 연구

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The use of lightweight polymeric composites with better physical and multifunctional capabilities in spacecraft can reduce its operating cost. However, the conventional carbon epoxy composites(CFRP) that are employed in the space environment, mostly Low Earth Orbit(LEO), have very poor shielding performance to environmental factors like Atomic Oxygen(AO), Ultraviolet radiation(UV), high vacuum, Thermal cycling and space debris impacts. Therefore, a polymer coating using Polybenzimidazole(PBI), a high performance thermoplastic polymer, is suggested in this research as a method to improve the shielding performance towards hypervelocity debris impact. The coated samples tested for resistance to AO, UV, thermal cycling and high vacuum in a LEO simulation facility revealed that the mass loss and surface erosion decreases, inferring enhanced protection than CFRP. Hypervelocity impact tests performed using a two stage light gas gun(LGG) showed that the energy absorption of the CFRP improved by PBI coating. Therefore, the PBI film coating can effectively improve the shielding performance of the composite material. The study also discusses the effectiveness of adding nanomaterials like carbon nanotubes(CNT’s) and graphene in the PBI coating towards the LEO environment shielding performance. It was observed that adding CNT’s and graphene had no considerable improvement in impact energy absorption. Regardless of this, both nanoparticles showed a very good reduction in mass loss and surface erosion towards other LEO environmental factors making them suitable as fillers in the PBI film.
Advisors
Kim, Chun-Gonresearcher김천곤researcher
Description
한국과학기술원 :항공우주공학과,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 항공우주공학과, 2016.8 ,[viii, 57 p. :]

Keywords

Hypervelocity Impact; Polybenzimidazole (PBI) film; Carbon fiber reinforced polymers (CFRP); Low earth Orbit (LEO); Light Gas Gun (LGG); 초고속 충돌; 폴리벤즈이미다졸; 탄소섬유복합재료; 저궤도 우주; 경 가스 총

URI
http://hdl.handle.net/10203/222009
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=663520&flag=dissertation
Appears in Collection
AE-Theses_Master(석사논문)
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