Method of impregnating reticulated foam with polymide foam and products
thereof
    83.
    发明授权
    Method of impregnating reticulated foam with polymide foam and products thereof 失效
    用聚酰亚胺泡沫体浸渍网状泡沫及其制品的方法

    公开(公告)号:US5135959A

    公开(公告)日:1992-08-04

    申请号:US702952

    申请日:1991-05-20

    Inventor: Francis U. Hill

    Abstract: A method of forming complex polyimide foam shapes by impregnating a low density, open cell, reticulated form with polymide foam precursor, placing the combination in a mold, closing the mold, then heating the assembly to the foaming and curing temperatures of the precursor. As the powdered precursor expands, it spreads throughout the reticulated foam producing a product having substantially uniform density and polyimide foam characteristics. If desired, the reticulated foam can be removed from the product by using a material that outgasses and boils away at polyimide processing temperatures. Radar absorbing materials may be incorporated in the reticulated foam so that the final product will have uniformly distributed radar absorbing components with the desirable high temperature resistance and other properties of polyimide foams.

    Composition of polyimide powder and polyformaldehyde
    84.
    发明授权
    Composition of polyimide powder and polyformaldehyde 失效
    聚酰亚胺粉末和聚甲醛的组成

    公开(公告)号:US3883452A

    公开(公告)日:1975-05-13

    申请号:US36058273

    申请日:1973-05-15

    Applicant: DU PONT

    Abstract: A composition of a coalescible polyimide powder and a polymer of formaldehyde is provided, said composition adapted for fabricating porous polyimide shaped articles by subjecting said composition to a forming pressure of about 100,000 psi to provide a preform, and thereafter sintering said preform by heating said preform to a temperature above about 300*C. to provide a porous polyimide shaped article having interconnecting pores; said porous polyimide shaped articles being useful as, for example, oil-impregnated bearings.

    Abstract translation: 提供可聚结聚酰亚胺粉末和甲醛聚合物的组合物,所述组合物适用于通过使所述组合物经受所述组合物的约100,000psi的成形压力以提供预制件来制造多孔聚酰亚胺成形制品,然后通过加热所述预制件 至高于约300℃的温度,以提供具有互连孔的多孔聚酰亚胺成形制品; 所述多孔聚酰亚胺成形制品可用作例如含油轴承。

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