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頁籤選單縮合
題 名 | The Study of Mechanical Properties of Polyulethane-Urea Block Copolymers=聚胺基甲酸酯--尿素共聚合體機械性質之研究 |
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作 者 | 許耀基; 曾雯卿; | 書刊名 | 萬能學報 |
卷 期 | 18 1996.07[民85.07] |
頁 次 | 頁141+143-167 |
分類號 | 346.84 |
關鍵詞 | Block copolymers; 聚胺基甲酸酯; 尿素; 嵌狀共聚合體; |
語 文 | 英文(English) |
英文摘要 | A series of block copolymers with poly(m-pheny lene isophthalamide) (Nomex) segments length was prepared. The block copolymers were prepared using various molecular weight of polytetramethylene glycols (PTMG) as the soft segment and 4,4' -diphenylmethane diisocyanate (MDI) and 1,4-butane diol (BD), and aromatic diamineterminated Nomex as the hard segment. As to mechanical properties including steess-strain measurements of each block copolymers were discussed. The determined values of Young's modulus E, Mooney-Rivlin relation elastic parameters, C1 and C2, relaxation moduli, E(10S) and E(100S), as well as relaxation speed, Vr, and relaxation times, τ1, τ2 andτ3, were used to estimate the effect of hard segment and soft segment domains on the mechanical behavior of block copolymers. It was found that block copolymers apparently displayed elastic properties, especially using the molecular weight 2900 of PTMG exhibited more elastic behavior. |
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