查詢結果分析
相關文獻
頁籤選單縮合
題 名 | Synthesis and Properties of Novel Fluorinated Polyamides Based on 2-Trifluoromethyl-4,4'-diaminodiphenylether |
---|---|
作 者 | 楊金平; 陳瑞鑫; 陳奎宏; 陳雅萍; | 書刊名 | Journal of the Chinese Chemical Society |
卷 期 | 49:5 2002.10[民91.10] |
頁 次 | 頁927-934 |
分類號 | 346.01 |
關鍵詞 | 2-trifluoromethyl-4,4'-diaminodiphenylether; Direct polycondensation; Polyamides; |
語 文 | 英文(English) |
英文摘要 | A series of soluble fluorinated polyamides (4a-h) were synthesized from 2-trifluoromethyl-4,4'-diaminodiphenylether (2) with various aromatic diacids (3a-c) and imide-containing diacids (3d-h) via direct polycondensation with triphenyl phosphite and pyridine. Diamine 2 was prepared through nucleophilic substitution reaction 2-chloro-5-nitrobenzotrifluoride and 4-nitrophenol in the presence of anhydrous K□CO□ to yield the dinitro compound, followed by catalytic reduction with hydrazine and Pd/C. These polymers had inherent viscosities ranging from 0.85 to 1.12 dL/g. All of the polyamides were soluble in aprotic polar solvents such as NMP, DMAc, DMF, and DMSO. Polymer films 4a-h had tensile strengths of 77-95 Mpa, elongations to break of 8-40%, and initial moduli of 1.6-2.2 GPa. The glass transition temperatures of these polymers were in the range of 235-268℃, and the amount of carbonized residues of the polymers at 800℃ in nitrogen atmosphere were above 52%. |
本系統中英文摘要資訊取自各篇刊載內容。