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저차원 탄소나노구조 충진제 기반 폴리머 박막의 기계적 강도 특성 향상 연구
김휘동(Whi Dong Kim),안지영(Ji Young Ahn),김수형(Soo Hyung Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
We describe a new method to form polymer thin films, in which carbon nanofillers(CNs) are homogeneously distributed so that they can effectively strengthen the mechanical property of resulting polymer composite thin films via. wet phase inversion. To do so, mixed CNs with polymer in DMF solvent were dispersed in a water bath, wet polymer/CN composites were rapidly precipitated out, and simultaneously CNs were immobilized in the polymer matrix due to rapid solidification. Both hybrid polymer/CNs composite materials and pure polymer materials were prepared to form thin films by a mounting hot press. As the results of tensile strength and hardness tests for the polymer/CNs composite thin films prepared, it was found that the mechanical property of hybrid polymer/CNs composite film was much more increased than that of pure polymer thin films, suggesting that the contacted surface area of various CNs with polymers play a key role of effective filler in polymer matrix.
금속 산화제 입자의 나노구조 및 화학적 조성에 따른 고에너지 물질의 폭발특성 제어 연구
안지영(Ji Young Ahn),김휘동(Whi Dong Kim),김수형(Soo Hyung Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this study, we demonstrate a new method for tuning the energy release rate and pressurization rate of nanoenergetic materials by controlling the morphology and elemental composition of oxidizers. Oxidizer nanoparticles and nanowires were generated by a spray pyrolysis method combined with an electrospinning process, and then the nanoenergetic materials composed of fuel (Al) and oxidizer (CuO/Fe2O3) nanoparticles or nanowires were characterized by various techniques, including SEM and TEM. By controlling the mass fraction and nanostructures of CuO in the mixtures of CuO-Fe2O3 oxidizer composites, the pressurization rate of resulting nanoenergetic materials was increased to 2~10 times (i.e., maximum pressurization rate of ~1 psi/㎲). This suggests that one can tune the explosive reactivity of energetic materials by simply controlling the constituent elements and nanostructures of oxidizers.