Polymer(Korea) (폴리머)

The Polymer Society of Korea (한국고분자학회)
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Characterizations of Adhesion Property, Morphology and Cure Reaction of Epoxy/Polyamide/MPD Reactive Blend with Imidazole(2E4MZ-CN) Catalyst

이미다폴(2E4MZ-CN) 촉매 첨가에 의한 에폭시/폴리아미드/MPD 반응성 블렌드의 경화 반응, 형태학적 특징 및 접착력 향상 연구

  • Song, Hyun-Woo (Department of Chemical Engineering, Pusan National University) ;
  • Kang, Hak-Su (Department of Chemical Engineering, Pusan National University) ;
  • Kim, Won-Ho (Department of Chemical Engineering, Pusan National University) ;
  • Marzi, Stephan (LS-DYNA Simulations Group, Fraunhofer-IFAM) ;
  • Kim, Byung-Min (Department of Mechanical Engineering, Pusan National University) ;
  • Choe, Young-Son (Department of Chemical Engineering, Pusan National University)
  • Published : 2009.07.25
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Abstract

The morphology and mechanical properties of epoxy/polyamide/MPD/2E4MZ-CN reactive blends with various amount of catalyst were investigated. The cure behaviors, mechanical strengths, and morphological changes of the epoxy blend systems were analyzed by using DSC, UTM, and SEM, respectively. The amount of catalyst ranged from 0 to 3 phr, and the cure reaction occurred at $170^{\circ}C$ for 30 min. The maximum peaks in heat flow during cure reactions appeared at slightly lower temperature with increasing catalyst content, indicating that the cure reactions start at lower temperature by adding catalyst and polyamide rarely hinders the cure reaction paths. The co-continuous morphology was found in epoxy/polyamide(20 phr) blends and by adding catalyst to the blends much clearer and uniform co-continuous phase was observed. The surface tension of the mechanical test specimen was increased due to the AP plasma surface treatment, and then adhesion strength was increased by over 20% by adding 2 phr of catalyst to the blends. When considering morphological tuning of the blends by means of catalyst incorporation, it is expected that the increased elongation and adhesion strength can be achieved in the structural adhesive systems.

본 연구에서는 에폭시(DGEBA)/폴리아미드/MPD/2E4MZ-CN 반응성 블렌드의 경화 촉진제 함량에 따른 블렌드계의 형태학적 특징 및 기계적 물성에 대해 고찰하였다. 본 블렌드계의 경화거동은 DSC, 기계적 강도는 UTM, 형태학적 특징 변화는 SEM을사용하여 관찰하였다. 이미다졸(2E4MZ-CN) 경화촉진제의 함량을 $0{\sim}3\;phr$까지 조절 하였으며, 경화 반응 온도는 $170^{\circ}C$에서 30분간 유지하였다. 경화 촉진제의 함량이 증가함에 따라 최대 발열 온도가 미세하게 감소하는 경향을 보였으며, 이는 에폭시와의 상용성이 우수한 폴리아미드에 의해 경화 반응이 거의 방해받지 않았음을 보여 준다. 폴리아미드 함량이 20 phr인 조건에서 에폭시 블렌드계는 co-continuous한 분산상을 보이며, 이 조건에서 경화 촉진제의 첨가에 의해 더욱 균일한 co-continuous한 분산상이 나타났다. 상압 플라즈마 표면처리에 의해 표면장력이 증가되어 집착력이 향상되었으며, 경화 촉진제의 함량이 2 phr에서 가장 우수한 집착력을 보여 20% 이상의 집착력 향상 효과가 있었다. 이것은 경화 촉진제에 의한 블렌드계의 형태학적 조절을 고려하면 구조용 접착제에서 보다 향상된 집착력과 연신율을 동시에 기대할 수 있음을 보여 준다.

Keywords

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