Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Study of Cure Kinetics of Vacuum Bag Only Prepreg Using Differential Scanning Calorimetry

시차주사열량계를 이용한 진공백 성형 프리프레그의 경화 거동 연구

  • Hyun, Dong Keun (Material & Process Technology, Korean Air Aero-Space Division) ;
  • Lee, Byoung Eon (Material & Process Technology, Korean Air Aero-Space Division) ;
  • Shin, Do Hoon (Material & Process Technology, Korean Air Aero-Space Division) ;
  • Kim, Ji Hoon (School of Mechanical Engineering, Pusan National University)
  • Received : 2019.08.27
  • Accepted : 2020.03.16
  • Published : 2020.04.30
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Abstract

The cure kinetics of carbon fiber-reinforced prepreg for Vacuum Bag Only(VBO) process was studied by differential scanning calorimetry (DSC). The total heat of reaction (ΔHtotal = 537.1 J/g) was defined by the dynamic scanning test using prepregs and isothermal scanning tests were performed at 130℃~180℃. The test results of isothermal scanning were observed that the heat of reaction was increased as the temperature elevated. The Kratz model was applied to analyze the cure kinetics of resin based on the test results. To verify the simulation model, the degree of cure from panels using different cure cycles were compared with the measurement. The simulation model showed that the error against the experimental value was less than 3.4%.

본 연구에서는 시차주사 열량계(differential scanning calorimetry, DSC)를 이용하여 진공백 성형 공정에 사용되는 탄소 섬유 프리프레그의 경화 거동을 연구하였다. 프리프레그를 이용한 동적주사 시험을 통해 전체 발열량(ΔHtotal = 537.1 J/g)을 측정하였고, 130℃~180℃에서 등온주사 시험을 실시하였다. 등온주사 시험의 결과는 온도가 올라감에 따라 발열 반응이 증가되는 것을 확인하였다. 시험 결과를 토대로 수지의 경화 거동을 분석하기 위하여 Kratz 모델을 적용하였다. 서로 다른 경화 사이클로 제작된 평판의 경화도를 경화 예측 모델과 실험값을 비교하였다. 경화 예측 모델은 실험값 대비 3.4% 이하의 오차율을 보여 결과가 잘 부합하는 것을 확인하였다.

Keywords

References

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