The polyurethane prepolymers, which were previously systhesized from 4,4'-diphenylmethane diisocyanate(MDI) and polytetramethylene glycol(PTMG), were chain extended by ethylene diamine or polydimethytsiloxane having amino group at both ends of the chain(AT-PDMS), giving polyetherurethaneurea(PU) and polyetherurethanerea containing PDMS segment(PU-S) ,respectively The chain extender AT-PDMS was synthesized by the reaction of octamethylcyclotetrasiloxane with 1,3-bis(3-aminopropyl)tetramethylsiloxane. The tensile strength of PU-S was smaller than that of PU while the elongation of PU-S was larger than that of PU. In theraml gravimetric analysis, PU was almost completely degraded at 450℃ but PU-S-3 showed about 28% residue at the same temperature. The water contact angle of the air surface of PU-S-3 showed of PU-S film(102∼106°) was larger than that of PU film(86°). The elemental ratio of the air surface and the substrate surface of PU and PU-S was estimated by the electron spectroscopy for chemical analysis(ESCA). The air facing of PU film contains a greater concentration of hard segment than the substrate surface. On the other hand, the air facing surface of PU-S is found to be covered mostly with polydimethylsiloxane segment.

메틸렌디페닐이소시아네이트(MDI)와 폴리테트라메틸렌글리콜(PTMG)로부터 합성한 폴리우레탄 prepolymer를 에틸렌디아민 또는 양말단에 아미노기를 갖는 폴리디메틸실록산(AT-PDMS)으로 쇄연장하여 폴리에테르우레탄우레아(PU)및 실리콘을 함유하는 폴리에테르우레탄우레아(PUS)를 합성하였다 쇄연장제인 AT-PDMS는 octamethylcyclotetrasiloxane과 1.3-bis(3-aminopropyl)tetramethylsiloxane을 반응시켜 합성하였다. PU-S 필름의 인장강도는 에틸렌디아민을 쇄연장제로 사용하여 합성된 PU보다 낮았고 신장율은 PU보다 크게 나타났다. 연중량분석결과 PU는 450℃에서 거의 완전히 분해하였으나 PU-5-3는 같은 온도에서 28%의 잔유물이 남았다. 한편 필름표면의 적심성을 알아보기 위해 물접촉각을 측정한 결과 PU는 86℃ 나타내는 반면 PU-5는 102∼106°를 나타내었다. 또한 ESCA에 의해 PU 및 PU-5의 공기측과 기질측 표면의 원소조성을 조사한 결과 PU의 공기측 표면에는 hard segment가 많이 분포되어 있는 반면. PU-S의 공기측 표면에는 실리콘 segmentt가 많이 분포되어 있음을 알 수 있었다.

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