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    Polyamic acid precursors and methods for preparing higher molecular weight polyamic acids and polyimidebenzoxazole
    4.
    发明授权
    Polyamic acid precursors and methods for preparing higher molecular weight polyamic acids and polyimidebenzoxazole 失效
    聚酰胺酸前体和制备高分子量聚酰胺酸和聚酰亚胺苯并恶唑的方法

    公开(公告)号：US5985969A

    公开(公告)日：1999-11-16

    申请号：US27701

    申请日：1998-02-23

    申请人： William J. Harris ,  Wen-Fang Hwang

    发明人： William J. Harris ,  Wen-Fang Hwang

    IPC分类号： C08L79/08 ,  C08G73/10 ,  C08G73/22 ,  B29D22/00 ,  C08G63/08

    CPC分类号： C08G73/22 ,  C08G73/1085 ,  Y10T428/29 ,  Y10T428/31721

    摘要： Polyimide precursor solutions comprise an organic liquid and the reaction product of an aromatic dianhydride and an aromatic diaminobenzoxazole capped, on at least one terminal end, with a bifunctional chain extender. The bifunctional chain extender has one functional group reactive with the amine of the aromatic diaminobenzoxazole or the anhydride of the aromatic dianhydride and another functional group which does not form amic acid linkages, but which is capable of further reaction to increase the molecular weight of the polyimide precursor under conditions other than those used to react the aromatic diamine and aromatic dianhydride to form the polyimide precursor. These polyimide precursors can be converted into polyimidebenzoxazole polymers.

    摘要翻译： 聚酰亚胺前体溶液包含有机液体，芳族二酐和芳族二氨基苯并恶唑在至少一个末端封端的双官能增链剂的反应产物。 双功能扩链剂具有与芳族二氨基苯并恶唑或芳族二酐的酐反应的一个官能团和不形成酰胺键的另一官能团，但能进一步反应以增加聚酰亚胺的分子量 前体在除了用于使芳族二胺和芳族二酐反应以形成聚酰亚胺前体的条件之外的条件下进行。 这些聚酰亚胺前体可以转化成聚酰亚胺苯并恶唑聚合物。

    Short, functionalized, soluble carbon nanotubes, methods of making same, and polymer composites made therefrom
    7.
    发明授权
    Short, functionalized, soluble carbon nanotubes, methods of making same, and polymer composites made therefrom 有权
    短功能化，可溶性碳纳米管，其制备方法和由其制备的聚合物复合材料

    公开(公告)号：US08313724B2

    公开(公告)日：2012-11-20

    申请号：US12280523

    申请日：2007-02-22

    申请人： Wen-Fang Hwang ,  Zheyl Chen ,  James M. Tour

    发明人： Wen-Fang Hwang ,  Zheyl Chen ,  James M. Tour

    IPC分类号： C01B31/00 ,  C01B31/02

    CPC分类号： B82Y30/00 ,  B82Y40/00 ,  C01B32/174 ,  C01B32/176 ,  C01B2202/02 ,  C01B2202/28

    摘要： In some embodiments, the present invention relates to new processes to simultaneously shorten and functionalize raw or purified carbon nanotubes to improve their dispersity and processibility, and the short functionalized nanotubes that may be made by the processes. This present invention also relates to new compositions of matter using short functionalized carbon nanotubes with thermoset, thermoplastic polymers, high temperature polymers, and other materials; the processes for making such composite materials; and the products of said processes.

    摘要翻译： 在一些实施方案中，本发明涉及同时缩短和官能化原始或纯化的碳纳米管以提高其分散性和可加工性的新方法以及可通过该方法制备的短官能化纳米管。 本发明还涉及使用具有热固性，热塑性聚合物，高温聚合物和其它材料的短官能化碳纳米管的物质的新组合物; 制造这种复合材料的方法; 和所述方法的产品。

    Polyamic acids and methods to convert polyamic acids into polyimidebenzoxazole films
    8.
    发明授权
    Polyamic acids and methods to convert polyamic acids into polyimidebenzoxazole films 失效
    聚酰胺酸和将聚酰胺酸转化成聚酰亚胺苯并恶唑膜的方法

    公开(公告)号：US5919892A

    公开(公告)日：1999-07-06

    申请号：US331775

    申请日：1994-10-31

    申请人： Wen-Fang Hwang ,  William J. Harris

    发明人： Wen-Fang Hwang ,  William J. Harris

    IPC分类号： B05D7/24 ,  B29C41/12 ,  B29K79/00 ,  B29L7/00 ,  C08G73/10 ,  C08G73/22 ,  C08J5/18 ,  C08G73/06

    CPC分类号： C08G73/1085 ,  C08G73/22

    摘要： This invention relates to polyamic acids and to methods for converting polyamic acid into polyimidebenzoxazole polymers. The polyamic acids are prepared by reacting a dianhydride with a diaminobenzoxazole under conditions sufficient to form polyamic acid with an inherent viscosity of greater than 2.0 dL/gram, as measured at 0.2 g/dL in N-methyl-pyrrolidinone at 25.degree. C. The polyamic acids are converted to polyimidebenzoxazole in the form of films, fiber, coatings and the like using thermal and chemical processes.

    摘要翻译： 本发明涉及聚酰胺酸和将聚酰胺酸转化成聚酰亚胺苯并恶唑聚合物的方法。 聚酰胺酸是通过使二酐与二氨基苯并恶唑在足以形成聚酰胺酸的条件下制备的，该聚酰胺酸的特性粘度大于2.0dL /克，在25℃在N-甲基 - 吡咯烷酮中以0.2g / dL测量。 使用热和化学方法将聚酰胺酸转化成膜，纤维，涂层等形式的聚酰亚胺苯并恶唑。