화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.24, No.2, 245-251, March, 2000
Export Citation
에폭시/폴리우레탄 블렌드 시스템의 표면 자유에너지 변화가 기계적 특성에 미치는 영향
Effect of Surface Free Energies on Mechanical Properties of Epoxy/Polyurethane Blend System
박수진†, 진중성, 이재락, 박병기1
  • 한국화학연구소 화학소재연구부
  • 1전북대학교 섬유공학과
Soo-Jin Park†, Joong-Seong Jin, Jae-Rock Lee, and Pyong0Ki Pak1
  • Advanced Materials Division, Korea Research Institute of Chemical Technology, P.O. Box 107, Yusong, Taejon 305-600, Korea
  • 1Department of Textile Engineering, Chonbuk Natioanl University, Chunbuk 561-756, Korea
E-mail:
초록
에폭시(EP) 수지와 폴리우레탄(PU)으로 제조된 블렌드 시스템의 접촉각과 기계적 특성을 연구하였다. EP의경화제로 20phr의 DDM(4,4''-diamino diphenyl methane)이 사용되었으며 EP/PU의 함량은 100/0∼100/60까지 변화시켰다. 접촉각은 Rame-Hart goniometer를 사용하였으며 젖음액으로는 증류수와 diiodomethane을 사용하였다. 본 연구에서는 geometric방법을 사용한 Owens-Wendt와 Wu''s model이 블렌드 시스템의 표면 자유에너지를 알아보는데 사용되었다. 시편의 기계적 성질과 강인성은 임계 응력 세기 인자(critical stress intensity factor, KIC와 그 충격 강도 시혐을 통하여 알아보았다. 그리고 특히 충격 강도는 상온과 극저온에서 알아보았다. 그 결과로서, 블렌드 시스템에 있어서 표면 자유에너지의 극성 요소는 저온에서 충격 강도를 증가시키는 PU의 함량에 크게 영향을 주었음을 알 수 있었다.
A blend system perpared from epoxy(EP) and polyurethane(PU) was investigated in terms of the contact angle and mechanical properties. The contents of EP/PU were varied within 100/0∼100/60 phr in the presence kof 20 phr DDM(4,4''-diamino diphenyl methane) as a curing agent for epoxy resin. Contact angle measurements were performed empolying a Rame-Hart contact angle goniometer. Deionized water and diiocometane were chosen as the testing liquids. In this work, Owens-Wendt and Wu''s models using a geometric mean were studied to analyze the surface free energy of blend system. For the mechanical and toughening properties of the casting specimens, the critical stress intensity factor(KIC) and impsct tser were performed. Especially, the impact test was carried out at room and sryogenic temperatures. As a result, spectfic or polar component of the surface free energy of the blend system was largely influenced on the addition of the PU resulting in increasing the impact strength for the excellent low-temperature performance.
Keywords:epoxy;polyurethane;econtact angle;impact test;ctyogenic
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