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    • 5. 发明授权
    • Pyrolysis of ceramic precursors to nanoporous ceramics
    • 陶瓷前体热解为纳米多孔陶瓷
    • US5872070A
    • 1999-02-16
    • US778531
    • 1997-01-03
    • John Pickett DismukesJack Wayne JohnsonJames L. Pizzulli
    • John Pickett DismukesJack Wayne JohnsonJames L. Pizzulli
    • C01B33/12C04B38/00C04B38/06
    • C04B38/0022Y10S977/831
    • The present invention provides for amorphous, nanoporous, ceramic material having a surface area in excess of 70 m.sup.2 /gm and characterized by a high content of open microporous cell structure wherein the micropores have a mean width of less than 20 Angstroms and wherein said microporous structure comprises a volume of greater than about 0.03 cm.sup.3 /gm of the ceramic. The invention also provides a process for the preparation of such nanoporous ceramics wherein a ceramic precursor polymer or oligomer is gradually heated in the presence of an inert gas or vacuum up to a maximum temperature in the range of greater than 400.degree. C. up to about 650.degree. C. Optionally, the process may also include a crosslinking step conducted prior to the heating step wherein the precursor polymer or oligomer is heated in the presence of a crosslinking agent capable of undergoing addition or substitution reactions with backbone atoms present in said precursor material, at an intermediate temperature of about 100.degree. to 400.degree. C. for a period of time sufficient to crosslink said precursor material, followed by pyrolysis of the crosslinked material.
    • 本发明提供了具有超过70m 2 / gm的表面积的无定形纳米多孔陶瓷材料,其特征在于高含量的开孔微孔孔结构,其中微孔具有小于20埃的平均宽度,并且其中所述微孔结构 包括大于约0.03cm 3 / gm的陶瓷体积。 本发明还提供了一种制备这种纳米多孔陶瓷的方法,其中陶瓷前体聚合物或低聚物在惰性气体或真空存在下逐渐加热至高达400℃至最高约400℃的最高温度 任选地,该方法还可以包括在加热步骤之前进行的交联步骤,其中前体聚合物或低聚物在能够与存在于所述前体材料中的骨架原子进行加成或取代反应的交联剂存在下加热 在约100-400℃的中间温度下搅拌一段足以交联所述前体材料的时间,然后热解交联的材料。