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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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Author: search.filters.author.Chou, CHSubject: search.filters.subject.amorphous

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    Synthesis and characterization of spirobifluorene-based polyimides
    (2002-11-01)
    Chou, CH
    ;
    Reddy, DS
    ;
    Shu, CF
    ;
    應用化學系
    ;
    Department of Applied Chemistry
    The synthesis and properties of organosoluble aromatic polyimides, containing spiro-skeletal units in the polymer backbone on the basis of the spiro-diamine monomer, 2,2'-diamino-9,9'-spirobifluorene, are described. In the case of the Spiro segment, the two fluorene rings are orthogonally arranged and connected through a tetrahedral bonding carbon atom, the Spiro center. As a consequence, the polymer chain is periodically zigzagged with a 90degrees angle at each Spiro center. This structural feature minimizes interchain interactions and restricts the close packing of the polymer chains, resulting in amorphous polyimides that have good solubility in organic solvents. Compared with their fluorene-based cardo analogues, the spirobifluorene-based polyimides have an improved solubility. Furthermore, the main-chain rigidity of the polyimide appears to be preserved because of the presence of the spiro structure, which restricts the free segmental mobility. As a result, these polyimides exhibit a high glass-transition temperature (T-g's) and good thermal stability. The T-g's of these polyimides were in the range of 287-374 degreesC, and the decomposition temperatures in nitrogen for a 10% weight loss occurred at temperatures above 570 degreesC. (C) 2002 Wiley Periodicals, Inc. J Polym, Sci Part A: Polym Chem 40: 3615-3621, 2002.