Article
  • Cure and Mechanical Behaviors of Cycloaliphatic/DGEBA Epoxy Blend System using Electron-Beam Technique
  • Lee JR, Heo GY, Park SJ
  • 전자선 조사에 의한 고리지방족/DGEBA 에폭시 블렌드 시스템의 경화 및 기계적 특성
  • 이재락, 허건영, 박수진
Abstract
4-Vinyl-1-cyclohexene diepoxide (VCE)/diglycidyl ether of bisphenol-A (DGEBA) epoxy blends with benzylquinoxalinium hexafluoroanti-monate were cured using an electron-beam technique. The effect of DGEBA content to VCE on cure behavior, thermal stabilities, and mechanical properties was investigated. The composition of VCE/DGEBA blend system varied within 100:0, 80:20, 60:40, 40:60, 20:80, and 0:100 wt%. The cure behavior and thermal stability of the cured specimens was monited by near-infrared spectroscopy and thermogravimetric analysis, respectively. Also, the critical stress intensity factor (KIC) test of the cured specimens was performed to study the mechanical interfacial properties. As a result, the decreases of short side-chain structure and chain scission were observed in NIR measurements as the DGEBA content increases, resulting in varying the hydroxyl and carbonyl groups. And, the initial decomposition temperature (IDT), temperature of maximum weight loss (Tmax), and decomposition activation energy (Ed) as thermal stability factors were increased with increasing the DGEBA content. These results could be explained by mean of decreasing viscosity, stable aromatic ring structure, and grafted interpenetrating polymer network with increasing of DGEBA content. Also, the maximum KIC value showed at mixing ratio of 40:60 wt% in this blend system.

Benzylquinoxalinium hexafluoroantimonate를 함유한 4-vinyl-1-cyclohexene diepoxide (VCE)/ diglycidyl ether of bisphenol-A (DGEBA) 에폭시 블렌드를 전자선을 사용하여 경화하였다. 그리고 VCE에서 DGEBA의 함량이 경화 거동, 열적 그리고 기계적 특성에 미치는 영향을 연구하였다. VCE/DGEBA 블렌드계의 조성은 100:0, 80:20, 60:40, 40:60, 20:80, 및 0:100 wt%로 하였다. 경화 거동과 열안정성은 근적외선 분광기와 열중량 분석기로 각각 측정하였다. 또한 기계적 계면 특성을 연구하기 위하여 경화된 시편의 임계응력세기인자 (KIC) 실험을 수행하였다. 그 결과 DGEBA 함량 증가와 함께 수산화기와 카보닐기에 기인한 짧은 곁사슬 구조와 사슬 절단의 감소가 근적외선 분광법에 의해서 측정되었다. 그리고 열안정성 인자들로서 초기 열분해 온도 (IDT), 최대 무게 감량시 온도 (Tmax), 그리고 분해 활성화 에너지 (Ed)는 DGEBA 함량 증가와 함께 증가하였다. 이러한 결과들은 DGEBA 함량 증가에 따른 점도의 감소와 안정된 방향족 고리 구조, 그리고 grafted IPN 구조로 설명될 수 있었다. 또한 최대 KIC 값은 40:60 wt%에서 보였다.

Keywords: epoy resin; electron-beam; cure behavior; thermal stability; critical stress intensity factor; grafted IPN

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
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This Article

  • 2003; 27(3): 210-216

    Published online May 25, 2003

  • Received on Dec 28, 2002
  • Accepted on Apr 1, 2003