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Joo-weon Ock

Joo-weon Ock. Synthesis of PU. Polyurethane. Polyurethane is a polymer composed of a chain of organic units joined by urethane links. MDI. PTMG. MDI. 1 차. Prepolymer. EDA ( E xtender). DEA (Terminator). 2 차. Hard Segment. Soft Segment. Synthesis of PU. Polyurethane.

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Joo-weon Ock

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  1. Joo-weonOck

  2. Synthesis of PU Polyurethane Polyurethane is a polymer composed of a chain of organic units joined by urethane links. MDI PTMG MDI 1차 Prepolymer EDA (Extender) DEA (Terminator) 2차 Hard Segment Soft Segment

  3. Synthesis of PU Polyurethane 1) PTMG (Polytetramethylene Ether Glycol) 분자구조식 : 2) MDI (4,4-DiisocyanatoDiphenylMethane) 분자구조식 :

  4. Synthesis of PU Polyurethane • Soft-segment • 1차중합시 주원료인 PTMG와 MDI의 반응에 의해 형성 Urethane 결합 Soft segment • Spandex 섬유중량의 약 65-90% 차지 • 보통의 이완된 상태에서는 무배향 상태임 : Soft segment • 굴곡성이 매우 풍부, 고신도 신장을 가능하게 함 (Urethane 결합 형성)

  5. Synthesis of PU Polyurethane 3) DMAc (N,N-Dimethylacetamide) 분자구조식 : 4) Amine 류

  6. Synthesis of PU Polyurethane • Hard-segment • 2차중합시1차중합물(프리폴리머)과 쇄연장제(EDA)의 반응으로 형성 Prepolymer Prepolymer Urea 결합 Hard segment • 요소결합 : 요소결합간 강한 수소결합 → 결정격자 형성, 신장시 미끄럼 방지, → Spandex 안정성, 탄성 및 강력을 부여하는 역할

  7. Synthesis of PU Polyurethane • 쇄연장, 종결반응 (2차 중합) (EDA) OCN-Prepolymer-NCO + (DEA)

  8. deformation is reversible (elastic)! IntroductionMechanisms of Elastic Behavior of PU s (MPa) brittle failure x plastic failure x x Polyurethane IntermoleucularH-bonding e initial: amorphous chains are final: chains are straighter, still cross-linked kinked, cross-linked.

  9. Introduction Polyurethane • 주, 부반응

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