Shape memory materials are widely used in high-tech industries. Although shape memory polymers have been developed, they have a disadvantage, only unidirectional resilience. Shape memory polymers with bi-directional recovery resilience have been actively studied. In this study, a bidirectional shape memory polyurethane was synthesized using poly(ε-caprolactone) diol, methylene dicyclohexyl diisocyanate, and hydroxyethyl acrylate. The first physical curing occurred between hard segments and hydrogen bondings when the solution was dried. The second curing in acrylate groups was performed by UV exposure. A degree of curing was analyzed by infrared spectroscopy. The shape memory properties of 2 step-cured polyurethanes were investigated as a function of UV curing time.

Abstract
 1. 서 론
 2. 실험 재료 및 방법
  2.1. 실험재료
  2.2. SMPU의 합성
  2.3 SMPU 필름의 제조
  2.4. SMPU 필름의 2차 경화
  2.5. 분석
 3. 결 과
  3.1. 합성
  3.2. 2차 경화
  3.3. 형상기억능력
 4. 결 론
 REFERENCES

• 노건호(부경대학교 고분자공학과) | Geon Ho Noh
• 이승재(부경대학교 고분자공학과) | Seungjae Lee,
• 배성국(한국신발피혁연구원) | Seong-Guk Bae
• 장성호(부산대학교 바이오환경에너지학과) | Seong-Ho Jang
• 이원기(부경대학교 고분자공학과) | Won-Ki Lee Corresponding author