Hyunsoo Hong*,
Seong-Su Kim*†
* Department of Mechanical Engineering, KAIST
*† Department of Mechanical Engineering, KAIST
홍현수* · 김성수*†
In this paper, the microwave irradiation process was
conducted during the Poly(vinylidene fluoride) (PVDF) nano-composite film
fabrication process to analyze how the b-crystalline is increased. TiO2
was added as a nanoparticle reinforcement to further improve the b-crystalline conformation of
the PVDF films by van der Waals force due to the difference of
electronegativity between PVDF and the metal oxide nanoparticle. The
crystalline conformation of the fabricated films was analyzed by X-ray
diffraction and Fourier transform infrared spectroscopy. According to these
analysis results, it was confirmed that the microwave irradiation process
during the solvent evaporation process increases the crystallinity of the PVDF
films, and more b-crystalline can be obtained
after additional film stretching process. It was also found that the PVDF
nano-composite films with the metal oxide have relatively higher b-crystalline conformation
rather than the neat PVDF films
본 연구에서는 Poly(vinylidene fluoride)
(PVDF) 필름 제작 과정 중 마이크로웨이브 처리 과정을 도입하여 b 결정성 향상에 어떠한 영향을 미치는지 분석하였다. 또한, 나노 입자 보강제로써 금속산화물인 TiO2를 혼합하여 PVDF 복합재료 필름을 만들어, 전기적 음성도 차이로 인한 반데르발스 힘을 통해 b 결정 형성을 추가적으로 향상 시키려고 하였다. FTIR과 XRD 분석을 통하여 해당 필름 시편들에 대해 결정화도(Crystallinity) 및 결정성(Crystalline)을 분석하였다. 이러한 분석 결과를 바탕으로, 용매 증발 과정 중 마이크로웨이브
처리 과정이 PVDF 필름의 결정화도를 높여주는 것을 확인하였고, 추가적인
연신(Stretching) 공정을 통해 a 결정에서 b 결정 변화(Crystalline
phase change)가 발생함으로써 결과적으로 더 많은 b 결정성을 나타내었다. 그리고
금속산화물을 넣은 PVDF 복합재료 필름이 Neat PVDF 필름보다
상대적으로 더 높은 b 결정성을 나타내는 것을 확인하였다
Keywords: PVDF, 결정화도(Crystallinity), 마이크로웨이브(Microwave), 용매 증발(Solvent evaporation), a-phase, b-phase
2020; 33(1): 19-24
Published on Feb 28, 2020
*† Department of Mechanical Engineering, KAIST