Combination structural support and thermal protection system
    24.
    发明申请
    Combination structural support and thermal protection system 有权
    组合结构支撑和热保护系统

    公开(公告)号:US20090022977A1

    公开(公告)日:2009-01-22

    申请号:US12174360

    申请日:2008-07-16

    IPC分类号: B32B5/16 C08K3/08

    摘要: A dielectric material includes a network of nanosubstrates, such as but not limited to nanotubes, nanosheets, or other nanomaterials or nanostructures, a polymer base material or matrix, and nanoparticles constructed at least partially of an elemental metal. The network has a predetermined nanosubstrate loading percentage by weight with respect to a total weight of the dielectric material, and a preferential or predetermined longitudinal alignment with respect to an orientation of an incident electrical field. A method of forming the dielectric material includes depositing the metal-based nanoparticles onto the nanosubstrates and subsequently mixing these with a polymer matrix. Once mixed, alignment can be achieved by melt extrusion or a similar mechanical shearing process. Alignment of the nanosubstrate may be in horizontal or vertical direction with respect to the orientation of an incident electrical field.

    摘要翻译: 电介质材料包括纳米基层网络,例如但不限于纳米管,纳米片或其它纳米材料或纳米结构,聚合物基材或基体,以及至少部分由元素金属构成的纳米颗粒。 网络具有相对于电介质材料的总重量的预定的纳米基质载荷百分比,以及相对于入射电场的取向的优选或预定的纵向对准。 形成电介质材料的方法包括将金属基纳米颗粒沉积到纳米基板上,随后将其与聚合物基体混合。 一旦混合,可以通过熔体挤出或类似的机械剪切工艺来实现对准。 纳米基板的对准可以相对于入射电场的取向在水平或垂直方向上。

    Polybenzimidazoles via aromatic nucleophilic displacement
    26.
    发明授权
    Polybenzimidazoles via aromatic nucleophilic displacement 失效
    聚苯并咪唑通过芳族亲核取代

    公开(公告)号:US5412059A

    公开(公告)日:1995-05-02

    申请号:US45335

    申请日:1993-04-05

    摘要: Novel molecular weight controlled and endcapped polybenzimidazoles (PBI) are prepared by the aromatic nucleophilic displacement reaction of di(hydroxyphenylbenzimidazole) monomers with activated aromatic dihalides or activated aromatic dinitro compounds. The PBI are endcapped with mono(hydroxyphenyl)benzimidazoles. The polymerizations are carried out in polar aprotic solvents such as N-methyl-2-pyrrolidinone or N,N-dimethylacetamide using alkali metal bases such as potassium carbonate at elevated temperatures under nitrogen. Mono(hydroxyphenyl)benzimidazoles are synthesized by reacting phenyl-4-hydroxybenzoate with aromatic (o-diamine)s in diphenylsulfone. Molecular weight controlled and endcapped PBI of new chemical structures are prepared that exhibit a favorable combination of physical and mechanical properties.

    摘要翻译: 通过二(羟基苯基苯并咪唑)单体与活性芳族二卤化物或活性芳族二硝基化合物的芳族亲核置换反应制备新型分子量控制和封端的聚苯并咪唑(PBI)。 PBI被单(羟基苯基)苯并咪唑封端。 聚合在极性非质子溶剂如N-甲基-2-吡咯烷酮或N,N-二甲基乙酰胺中,使用碱金属碱如碳酸钾,在氮气下在升高的温度下进行。 通过苯基-4-羟基苯甲酸酯与二苯砜中的芳族(邻二胺)反应合成单(羟基苯基)苯并咪唑。 制备新化学结构的分子量控制和封端的PBI,其表现出物理和机械性质的有利组合。

    Polybenzimidazole via aromatic nucleophilic displacement
    27.
    发明授权
    Polybenzimidazole via aromatic nucleophilic displacement 失效
    聚苯并咪唑通过芳族亲核取代

    公开(公告)号:US5317078A

    公开(公告)日:1994-05-31

    申请号:US790730

    申请日:1991-10-30

    IPC分类号: C07D235/18 C08G73/18

    CPC分类号: C08G73/18 C07D235/18

    摘要: Di(hydroxyphenyl)benzimidazole monomers were prepared from phenyl-4-hydroxybenzoate and aromatic bis(o-diamine)s. These monomers were used in the synthesis of soluble polybenzimidazoles. The reaction involved the aromatic nucleophilic displacement of various di(hydroxyphenyl)benzimidazole monomers with activated aromatic dihalides or activated aromatic dinitro compounds in the presence of an alkali metal base. These polymers exhibited lower glass transition temperatures, improved solubility, and better compression moldability over their commercial counterparts.

    摘要翻译: 由苯基-4-羟基苯甲酸酯和芳族双(邻二胺)制备二(羟基苯基)苯并咪唑单体。 这些单体用于合成可溶性聚苯并咪唑。 该反应涉及各种二(羟基苯基)苯并咪唑单体与活性芳族二卤化物或活性芳族二硝基化合物在碱金属碱存在下的芳族亲核取代。 这些聚合物显示出比其商业对应物更低的玻璃化转变温度,改善的溶解性和更好的压模成型性。

    Di(hydroxyphenyl)-benzimidazole monomers
    28.
    发明授权
    Di(hydroxyphenyl)-benzimidazole monomers 失效
    二(羟基苯基) - 苯并咪唑单体

    公开(公告)号:US5245044A

    公开(公告)日:1993-09-14

    申请号:US941816

    申请日:1992-09-08

    IPC分类号: C07D235/18 C08G73/18

    CPC分类号: C07D235/18 C08G73/18

    摘要: Di(hydroxyphenyl)benzimidazole monomers were prepared from phenyl-4-hydroxybenzoate and aromatic bis(o-diamine)s. These monomers were used in the synthesis of soluble polybenzimidazoles. The reaction involved the aromatic nucleophilic displacement of various di(hydroxyphenyl)benzimidazole monomers with activated aromatic dihalides or activated aromatic dinitro compounds in the presence of an alkali metal base. These polymers exhibited lower glass transition temperatures, improved solubility, and better compression moldability over their commercial counterparts.

    摘要翻译: 由苯基-4-羟基苯甲酸酯和芳族双(邻二胺)制备二(羟基苯基)苯并咪唑单体。 这些单体用于合成可溶性聚苯并咪唑。 该反应涉及各种二(羟基苯基)苯并咪唑单体与活性芳族二卤化物或活性芳族二硝基化合物在碱金属碱存在下的芳族亲核取代。 这些聚合物显示出比其商业对应物更低的玻璃化转变温度,改善的溶解性和更好的压模成型性。

    Polyimidazoles via aromatic nucleophilic displacement
    29.
    发明授权
    Polyimidazoles via aromatic nucleophilic displacement 失效
    聚咪唑通过芳族亲核取代

    公开(公告)号:US5116934A

    公开(公告)日:1992-05-26

    申请号:US732884

    申请日:1991-07-19

    摘要: Polyimidazoles (Pl) are prepared by the aromatic nucleophilic displacement reaction of di(hydroxyphenyl)imidazole monomers with activated aromatic dihalides or activated aromatic dinitro compounds. The reactions are carried out in polar aprotic solvents such as N,N-dimethylacetamide, sulfolane, N-methylpyrrolidinone, dimethylsulfoxide, or diphenylsulfone using alkali metal bases such as potassium carbonate at elevated temperatures under nitrogen. The di(hydroxyphenyl)imidazole monomers are prepared by reacting an aromatic aldehyde with a dimethoxybenzil or by reacting an aromatic dialdehyde with a methoxybenzil in the presence of ammonium acetate. The di(methoxyphenyl)imidazole is subsequently treated with aqueous hydrobromic acid to give the di(hydroxyphenyl)imidazole monomer. This synthetic route has provided high molecular weight Pl of new chemical structure, is economically and sythetically more favorable than other routes, and allows for facile chemical structure variation due to the availability of a large variety of activated aromatic dihalides and dinitro compounds.

    摘要翻译: 通过二(羟基苯基)咪唑单体与活性芳族二卤化物或活性芳族二硝基化合物的芳族亲核取代反应制备聚咪唑(P1)。 反应在极性非质子溶剂如N,N-二甲基乙酰胺,环丁砜,N-甲基吡咯烷酮,二甲基亚砜或二苯基砜中,使用碱金属碱如碳酸钾,在氮气下在升高的温度下进行。 二(羟基苯基)咪唑单体是通过使芳族醛与二甲氧基苯甲醚反应或在乙酸铵存在下使芳族二醛与甲氧基苯甲醚反应来制备的。 随后用氢溴酸水溶液处理二(甲氧基苯基)咪唑,得到二(羟基苯基)咪唑单体。 这种合成路线提供了新的化学结构的高分子量P1,在经济上和应用上比其他途径更有利,并且由于大量活性芳族二卤化物和二硝基化合物的可用性而允许容易的化学结构变化。

    Polyimidazoles via aromatic nucleophilic displacement
    30.
    发明授权
    Polyimidazoles via aromatic nucleophilic displacement 失效
    聚咪唑通过芳族亲核取代

    公开(公告)号:US5066811A

    公开(公告)日:1991-11-19

    申请号:US508316

    申请日:1990-04-12

    摘要: Polyimidazoles (Pl) are prepared by the aromatic nucleophilic displacement reaction of di(hydroxyphenyl)imidazole monomers with activated aromatic dihalides or activated aromatic dinitro compounds. The reactions are carried out in polar aprotic solvents such as N,N-dimethylacetamide, sulfolane, N-methylpyrroldinone, dimethylsulfoxide, or diphenylsulfone using alkali metal bases such as potassium carbonate at elevated temperature under nitrogen. The di(hydroxyphenyl)imidazole monomers are prepared by reacting an aromatic aldehyde with a dimethoxybenzil or by reacting an aromatic dialdehyde with a methoxybenzil in the presence of ammonium acetate. The di(methoxyphenyl)imidazole is subsequently treated with aqueous hydrobromic acid to give the di(hydroxyphenyl)imidazole monomer. This synthetic route has provided high molecular weight Pl of new chemical structure, is economically and synthetically more favorable than other routes, and allows for facile chemical structure variation due to the availability of a large variety of activated aromatic dihalides and dinitro compounds.

    摘要翻译: 通过二(羟基苯基)咪唑单体与活性芳族二卤化物或活性芳族二硝基化合物的芳族亲核取代反应制备聚咪唑(P1)。 反应在极性非质子溶剂如N,N-二甲基乙酰胺,环丁砜,N-甲基吡咯烷酮,二甲基亚砜或二苯基砜中,使用碱金属碱如碳酸钾,在升高的温度下在氮气下进行。 二(羟基苯基)咪唑单体是通过使芳族醛与二甲氧基苯甲醚反应或在乙酸铵存在下使芳族二醛与甲氧基苯甲醚反应来制备的。 随后用氢溴酸水溶液处理二(甲氧基苯基)咪唑,得到二(羟基苯基)咪唑单体。 这种合成路线提供了新的化学结构的高分子量Pl,在经济上和综合性上比其他途径更有利,并且由于大量活性芳族二卤化物和二硝基化合物的可用性而允许容易的化学结构变化。