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    Low dielectric polyimide fibers
    3.
    发明授权
    Low dielectric polyimide fibers 失效
    低介电聚酰亚胺纤维

    公开(公告)号：US5367046A

    公开(公告)日：1994-11-22

    申请号：US870003

    申请日：1992-04-10

    申请人： William E. Dorogy, Jr. ,  Anne K. St. Clair

    发明人： William E. Dorogy, Jr. ,  Anne K. St. Clair

    IPC分类号： C08G73/10 ,  D01F6/74 ,  C08G73/12 ,  B29C47/88 ,  B32B27/02 ,  D01F6/00

    CPC分类号： C08G73/1028 ,  C08G73/1039 ,  D01F6/74 ,  Y10T428/2913 ,  Y10T428/2967 ,  Y10T428/2969

    摘要： A high temperature resistant fiber, especially a polyimide fiber, having a dielectric constant less than 3 is prepared by first reacting 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane with 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride in an aprotic solvent to form a polyamic acid resin solution. The polyamic acid resin solution is then extruded into a coagulation medium to form polyamic acid fibers, which are thermally cured to their polyimide form. Alternatively, 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane with 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride to form a polyamic acid, and the polyamic acid is chemically converted to its polyimide form. The polyimide is then dissolved in a solvent to form a polyimide resin solution, and the polyimide resin is extruded into a coagulation medium to form a polyimide wet gel filament. In order to obtain polyimide fibers of increased tensile properties, the polyimide wet gel filaments are stretched at elevated temperatures. Tensile properties of the fibers were measured and found to be in the range of standard textile fibers. Polyimide fibers obtained by either method will have a dielectric constant similar to that of the corresponding polymer, viz., less than 3 at 10 GHz.

    摘要翻译： 通过首先使2,2-双[4-（4-氨基苯氧基）苯基]六氟丙烷与2,2-双（3,4-二甲氧基苯基）苯基]六氟丙烷反应，制备介电常数小于3的耐高温纤维，特别是聚酰亚胺纤维， 二羧基苯基）六氟丙烷二酐在非质子溶剂中反应形成聚酰胺酸树脂溶液。 然后将聚酰胺酸树脂溶液挤出到凝固介质中以形成热固化为其聚酰亚胺形式的聚酰胺酸纤维。 或者，将2,2-双（4-氨基苯氧基）苯基]六氟丙烷与2,2-双（3,4-二羧基苯基）六氟丙烷二酐反应形成聚酰胺酸，并将聚酰胺酸化学转化成其聚酰亚胺形式 。 然后将聚酰亚胺溶解在溶剂中以形成聚酰亚胺树脂溶液，并将聚酰亚胺树脂挤出到凝固介质中以形成聚酰亚胺湿凝胶长丝。 为了获得拉伸性能增加的聚酰亚胺纤维，聚酰亚胺湿凝胶长丝在升高的温度下拉伸。 测量纤维的拉伸性能，发现其在标准纺织纤维的范围内。 通过任一方法获得的聚酰亚胺纤维将具有类似于相应聚合物的介电常数，即在10GHz下小于3的介电常数。

    Wet spinning of solid polyamic acid fibers
    5.
    发明授权
    Wet spinning of solid polyamic acid fibers 失效
    固体聚酰胺酸纤维的湿法纺丝

    公开(公告)号：US5023034A

    公开(公告)日：1991-06-11

    申请号：US543926

    申请日：1990-06-26

    申请人： William E. Dorogy, Jr. ,  Anne K. St. Clair

    发明人： William E. Dorogy, Jr. ,  Anne K. St. Clair

    IPC分类号： D01F6/74

    CPC分类号： D01F6/74

    摘要： The invention is a process for the production of solid aromatic polyamic acid and polyimide fibers from a wet gel or coagulation bath wet get using N,N-dimethylacetamide (DMAc) solutions of the polyamic acid derived from aromatic dianhydrides such as 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA) and aromatic diamines such as 4,4'-oxydianiline (4,4'-ODA). By utilizing the interrelationship between coagulation medium and concentration, resin inherent viscosity, resin % solids, filament diameter, and fiber void content, it is possible to make improved polyamic acid fibers. Solid polyimide fibers, obtained by the thermal cyclization of the polyamic acid precursor, have increased tensile properties compared to fibers containing macropores from the same resin system.

    摘要翻译： 本发明是一种使用衍生自芳族二酸酐的聚酰胺酸（如3,3'，N，N-二甲基乙酰胺）的N，N-二甲基乙酰胺（DMAc）溶液从湿凝胶或凝固浴湿法制备固体芳族聚酰胺酸和聚酰亚胺纤维的方法， 4,4'-二苯甲酮四羧酸二酐（BTDA）和4,4'-氧二苯胺（4,4'-ODA）等芳族二胺。 通过利用凝固介质与浓度之间的相互关系，树脂固有粘度，树脂固含量，长丝直径和纤维空隙含量，可以制备改进的聚酰胺酸纤维。 通过聚酰胺酸前体的热环化获得的固体聚酰亚胺纤维与来自相同树脂体系的含有大孔的纤维相比具有增加的拉伸性能。