[논문]이소프로필 작용기가 그라프트된 폴리우레탄 공중합체의 분자간 인력 조절

정용찬; 최재원; 이혜림; 전병철

doi:10.12772/tse.2013.50.258

이소프로필 작용기가 그라프트된 폴리우레탄 공중합체의 분자간 인력 조절
Controlling Molecular Interactions between Polyurethane Copolymers by Grafting Isopropyl Functional Groups

한국섬유공학회지 = Textile science and engineering, v.50 no.4, 2013년, pp.258 - 265

정용찬 (수원대학교 자연과학대학 화학과) , 최재원 (인제대학교 나노공학부) , 이혜림 (수원대학교 자연과학대학 화학과) , 전병철 (인제대학교 나노공학부)

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Grafted isopropyl groups were used to control the molecular interactions between polyurethane (PU) copolymers, and their effect on the tensile properties of PU was investigated. The grafted isopropyl groups were selected to interrupt the molecular interactions and disturb the close contact between PU chains through its branched structure, and thus improve the low-temperature recovery while maintaining the high tensile properties and the shape recovery at ambient temperature. The grafted isopropyl groups made a difference to the phase separation of the hard and soft segments in the PU structure, as determined by IR and DSC. The crosslink density and viscosity experienced an unusual increase with the increase in isopropyl content owing to crosslinking by the grafting reagent. The shape recovery and retention remained high even with the grafted isopropyl groups. Finally, the effect of the isopropyl groups on low-temperature recovery was compared with that of the linear PU, and the reason for the flexibility is discussed.

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C. An FT-IR spectrometer (JASCO 300E, JASCO) that was equipped with an ATR was used to measure the IR spectrum using the following scan parameters: 4 cm^-1 resolution, 25 scans, and 2 mm/second scan speed. Low temperature recovery test was carried out in a cold chamber (Jisco J-RHC2) and was recorded by a video camera (SONY HDR series).

이론/모형

The UTM was also used to measure the stress and strain at various temperatures to investigate the shape memory effect. The shape memory test was carried out following a previously described method [6,17].
C for 60 hour to fabricate a thin film. The specimen was made from the thin film according to the specifications of ASTM D638. The tensile strength was measured according to ASTM D638 by a universal test machine (UTM) equipped with a temperature-controlled chamber (Lloyd Instrument, Model LR10K) with a gauge length of 25 mm, crosshead speed of 10 mm/minute, and a load cell of 2.

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이소프로필 작용기가 그라프트된 폴리우레탄 공중합체의 분자간 인력 조절
Controlling Molecular Interactions between Polyurethane Copolymers by Grafting Isopropyl Functional Groups

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이소프로필 작용기가 그라프트된 폴리우레탄 공중합체의 분자간 인력 조절 Controlling Molecular Interactions between Polyurethane Copolymers by Grafting Isopropyl Functional Groups

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이소프로필 작용기가 그라프트된 폴리우레탄 공중합체의 분자간 인력 조절
Controlling Molecular Interactions between Polyurethane Copolymers by Grafting Isopropyl Functional Groups

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