화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.39, No.4, 579-587, July, 2015
DOI10.7317/pk.2015.39.4.579  Export Citation
폴리(디메틸 실록산) 성분을 포함하는 폴리우레탄 필름의 물성과 미세 상분리
Physical Properties and Microphase Separation of Polyurethane Containing Poly(dimethyl siloxane) Component
라상희, 이희동, 김영호†
  • 숭실대학교 유기신소재 · 파이버공학과
Sang Hee Ra, Hee Dong Lee, and Young Ho Kim†
  • Department of Organic Materials and Fiber Engineering, Soongsil University, Seoul 156-743, Korea
E-mail:
초록
메틸렌디페닐 디이소시아네이트와 1,4-부탄디올을 하드세그먼트(HS) 성분으로 하고, 폴리(디메틸 실록산) (PDMS) 디올과 폴리(테트라메틸렌 에테르 글리콜) (PTMEG) 혼합 폴리올을 소프트세그먼트(SS) 성분으로 하여, HS 함량이 각각 23와 32%이면서 PDMS 성분 비율이 다른 여러가지 PU-Si를 용액중합법으로 합성하고 이들을 필름으로 제조하여 물성과 상분리 구조를 분석하였다. PU-Si 필름에서 PDMS 성분 비율이 커지면 파단응력은 감소하는 반면 파단신도는 증가하였다. PU-Si에 PDMS 성분이 증가할수록 소수성이 커지고 HS와 SS 사이의 상분리는 감소하였다. HS 함량이 32%인 시료들이 HS 함량이 23%인 시료보다 상분리가 잘 되어 있으며, 두 경우 모두 PDMS 성분이 증가하면 상분리 정도가 감소하였다.
Polyurethanes (PUs) containing poly(dimethyl siloxane) (PDMS) unit in soft segment, PU-Si, were synthesized, and their mechanical properties and phase separation were investigated. Various amounts of PDMS units were incorporated into PU via a solution polymerization method in N,N'-dimethylformamide using poly(tetramethylene ether glycol) and PDMS diol as a soft segment and methylene diphenyl diisocyanate and 1,4-butanediol as a hard segment. Two series of PU-Si samples with an HS content of 23% and 32% were prepared and analyzed. Results showed that the elongation-at-break of the PU-Si films increased, breaking stress decreased, and the hydrophobicity of the film increased as the PDMS content in PU-Si increased. SAXS analysis indicated that the microphase separation of the PU-Si film between hard and soft segments decreased with increasing PDMS content, irrespective of the HS content.
Keywords:polyurethane;poly(dimethyl siloxane);mechanical properties;phase separation;SAXS
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