Process for preparing essentially colorless polyimide film containing
phenoxy-linked diamines
    21.
    发明授权
    Process for preparing essentially colorless polyimide film containing phenoxy-linked diamines 失效
    制备基本上无色的含苯氧基连接的二胺的聚酰亚胺膜的方法

    公开(公告)号:US4595548A

    公开(公告)日:1986-06-17

    申请号:US643524

    申请日:1984-08-23

    IPC分类号: C08G73/10 C08J3/09 C08J5/18

    摘要: An aromatic condensation polyimide film that is approximately 90% transparent at 500 nm, useful for thermal protective coatings and the like, and the processes for preparing same by thermal and chemical conversion are disclosed. An essential feature of the invention for achieving maximum optical transparency films requires utilizing recrystallized and/or sublimated specific aromatic diamines and dianhydride monomers and introducing phenoxy or thiophenyl separator groups and isomeric m,m'- or o,p'-oriented diamines into the polymer molecular structure. The incorporation of these groups in the polymer structure serves to separate the chromaphoric centers and reduce the formation of inter-chain and intra-chain charge transfer complexes which normally cause absorptions in the UV-visible range. The films may be obtained by hand, brushing, casting or spraying a layer of the polyamic acid solutions onto a surface and thermally converting the applied layer to the polyimide or the polyamic acid solution can be chemically converted to the polyimide, subsequentially dissolved in an organic solvent, and applied as a polyimide film layer with the solvent therein thermally removed.

    摘要翻译: 公开了一种在500nm下约90%透明度的用于热保护涂层等的芳族缩合聚酰亚胺膜及其通过热和化学转化制备方法。 本发明实现最大光学透明膜的本质特征需要使用重结晶和/或升华的特定芳族二胺和二酐单体,并将苯氧基或噻吩基隔离基和异构体m,m'-或o,p'-取向的二胺引入聚合物 分子结构。 这些基团在聚合物结构中的引入用于分离色盲中心并减少通常在UV-可见光范围内引起吸收的链间和链内电荷转移络合物的形成。 可以通过手工,刷涂,浇铸或将一层聚酰胺酸溶液喷涂到表面上并将所施加的层热转化为聚酰亚胺或聚酰胺酸溶液而将聚合物化学转化为聚酰亚胺,随后溶解在有机 溶剂,并作为聚酰亚胺膜层施加其中热溶解的溶剂。

    Polymer-polymer bilayer actuator
    24.
    发明授权
    Polymer-polymer bilayer actuator 失效
    聚合物 - 聚合物双层致动器

    公开(公告)号:US06545391B1

    公开(公告)日:2003-04-08

    申请号:US09696524

    申请日:2000-10-23

    IPC分类号: H01L4109

    摘要: A device for providing an electromechanical response includes two polymeric webs bonded to each other along their lengths. At least one polymeric web is activated upon application thereto of an electric field and exhibits electrostriction by rotation of polar graft moieties within the polymeric web. In one embodiment, one of the two polymeric webs in an active web upon application thereto of the electric field, and the other polymeric web is a non-active web upon application thereto of the electric field. In another embodiment, both of the two polymeric webs are capable of being active webs upon application thereto of the electric field. However, these two polymeric webs are alternately activated and non-activated by the electric field.

    摘要翻译: 用于提供机电响应的装置包括沿其长度彼此结合的两个聚合物网。 至少一个聚合物纤维网在施加电场时被激活,并且通过旋转聚合物网内的极性接枝部分显示电致伸缩。 在一个实施方案中,当施加到电场上时,活性纤维网中的两个聚合物网中的一个是电场施加时的非活性纤维网。 在另一个实施方案中,两个聚合物网络都可以在施加到电场上时成为活性纤维网。 然而,这两个聚合物网络被电场交替活化并且不被活化。

    Hollow polyimide microspheres
    26.
    发明授权
    Hollow polyimide microspheres 有权
    中空聚酰亚胺微球

    公开(公告)号:US6084000A

    公开(公告)日:2000-07-04

    申请号:US394534

    申请日:1999-09-10

    摘要: A shaped article composed of an aromatic polyimide has a hollow, essentially spherical structure and a particle size of about 100 to about 1500 .mu.m, a density of about 1 to about 6 pounds/ft.sup.3 and a volume change of 1 to about 20% by a pressure treatment of 30 psi for 10 minutes at room temperature. A syntactic foam, made of a multiplicity of the shaped articles which are bonded together by a matrix resin to form an integral composite structure, has a density of about 3 to about 30 pounds/ft.sup.3 and a compression strength of about 100 to about 1400 pounds/in.sup.2.

    摘要翻译: 由芳族聚酰亚胺组成的成形制品具有中空的,基本上为球形的结构,并且具有约100至约1500μm的粒度,约1至约6磅/ ft 3的密度和1至约20%的体积变化,由 在室温下压力处理30psi 10分钟。 由多个成形制品制成的复合泡沫体,其通过基质树脂粘合在一起以形成整体复合结构,其密度为约3至约30磅/英3 3,压缩强度为约100至约1400磅 / in2。

    Structures from low dielectric polyimides
    28.
    发明授权
    Structures from low dielectric polyimides 失效
    低介电聚酰亚胺的结构

    公开(公告)号:US5338826A

    公开(公告)日:1994-08-16

    申请号:US954108

    申请日:1992-09-28

    IPC分类号: C08G73/10 B05D5/06 B32B27/00

    摘要: A structure which is effective as an electrical insulator or as a transmitter-receiver of electromagnetic energy is prepared by providing a suitable substrate and covering the substrate with an adhering layer of a low dielectric, high temperature, linear aromatic polyimide. This polyimide is prepared by:(1) selecting aromatic diamine and aromatic dianhydride reactants to meet at least two of the following three conditions:(a) a reactant must have minimal permanent or inducible electrical dipolar characteristics as a result of the presence of pendant or bridging groups therein;(b) a reactant must impart a high degree of free volume to the polymer caused by inefficient chain packing therein in the solid state as a result of the presence of pendant or bridging groups therein; and(c) a reactant must have fluorine atoms chemically attached thereto; and(2) chemically combining equimolar quantities of the aromatic diamine and aromatic dianhydride reactants in a solvent to form a high molecular weight polyamic acid solution, and converting the high molecular weight polyamic acid to the corresponding low dielectric, high temperature linear aromatic polyimide.

    摘要翻译: 作为电绝缘体或作为电磁能的发射器 - 接收器有效的结构通过提供合适的衬底并用低电介质,高温线性芳族聚酰亚胺的粘附层覆盖衬底来制备。 该聚酰亚胺通过以下方法制备:(1)选择芳族二胺和芳族二酐反应物以满足以下三个条件中的至少两个:(a)反应物必须具有最小的永久或可诱导的电偶极特性,这是由于存在侧基或 桥接基团; (b)由于在其中存在侧基或桥连基团,反应物必须赋予聚合物在固态中由于无效的链填料而导致的高度的自由体积; 和(c)反应物必须具有化学连接的氟原子; 和(2)将等摩尔量的芳族二胺和芳族二酐反应物在溶剂中化学组合以形成高分子量聚酰胺酸溶液,并将高分子量聚酰胺酸转化为相应的低电介质,高温线性芳族聚酰亚胺。

    Poly(carbonate-imide) polymer
    30.
    发明授权
    Poly(carbonate-imide) polymer 失效
    聚(碳酸酯 - 酰亚胺)聚合物

    公开(公告)号:US4713439A

    公开(公告)日:1987-12-15

    申请号:US834978

    申请日:1986-02-27

    IPC分类号: C08G69/44 C08G69/26

    CPC分类号: C08G69/44

    摘要: A novel series of polymers and copolymers based on a polyimide backbone with the incorporation of carbonate moieties along the backbone. The process for preparing these polymers and copolymers is also disclosed as is a novel series of dinitrodiphenyl carbonates and diaminodiphenyl carbonates. The novel polymers and copolymers exhibit high temperature capability and because of the carbonate unit, many exhibit a high degree of order and/or crystallinity.

    摘要翻译: 一种基于聚酰亚胺骨架的新型聚合物和共聚物系列,其中沿骨架加入碳酸酯部分。 还公开了制备这些聚合物和共聚物的方法,是一系列新的一系列二硝基二苯基碳酸酯和二氨基二苯基碳酸酯。 新型聚合物和共聚物表现出高温能力,并且由于碳酸酯单元,许多表现出高度的顺序和/或结晶度。