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セグメンティドポリウレタンの動的粘弾性


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Title: セグメンティドポリウレタンの動的粘弾性
Other Titles: Dynamic Viscoelastic Properties of Segmented Polyurethanes
Authors: 古川, 睦久 / 緒方, 元範 / 横山, 哲夫
Authors (alternative): Furukawa, Mutsuhisa / Ogata, Motonori / Yokoyama, Tetsuo
Issue Date: Dec-1974
Publisher: 長崎大学工学部 / Faculty of Engineering, Nagasaki University
Citation: 長崎大学工学部研究報告, (5), pp.135-142; 1974
Abstract: Four types of segmented polyurethanes with systematically varying blockness of hard segment were prepared. The dynamic viscoelastic properties of the segmented polyurethanes were studied in a wide range of temperature. These segmented polyurethanes were prepared by prepolymer technique using polyoxy tetramethylene glycol (PTMG) (Mn=1000 and 2000) and 4, 4'-diphenylmethanediisocyanate as starting materials and hydrazine and ethylenediamine as chain extenders. The samples were studied at a frequency of 110 Hz by Vibron DDV III-B. Differential scanning calorimetry (DSC) and infrared spectroscopy were also studied. These segmented polyurethanes showed tanδ maxima at two temperatures (-120℃ and -50℃). As the hard segment concentration was increased, main dispersion shifted to a lower temperature, its height of tanδ peak decreased and its width widened. As the moleculare weight of PTMG was increased, main dispersion shifted to a lower temperature. Storage modulus E' in a series of PTMG 1000-HD was increased as hard segment concentration was increased, but E' in a series of PTMG 2000-HD and -EDA were not affected. The dispersions were interpreted in terms of molecular motion and the difference of composition of segmented polyurethanes.
URI: http://hdl.handle.net/10069/23828
ISSN: 02860902
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:No.5

Citable URI : http://hdl.handle.net/10069/23828

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