发明授权
- 专利标题: Space environmentally durable polyimides and copolyimides
- 专利标题(中): 空间环保的聚酰亚胺和共聚酰亚胺
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申请号: US10095340申请日: 2002-03-08
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公开(公告)号: US06841652B2公开(公告)日: 2005-01-11
- 发明人: John W. Connell , Joseph G. Smith, Jr. , Paul M. Hergenrother , Kent A. Watson , Craig M. Thompson
- 申请人: John W. Connell , Joseph G. Smith, Jr. , Paul M. Hergenrother , Kent A. Watson , Craig M. Thompson
- 申请人地址: US DC Washington
- 专利权人: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
- 当前专利权人: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
- 当前专利权人地址: US DC Washington
- 代理商 Robin W. Edwards
- 主分类号: C08G73/10
- IPC分类号: C08G73/10 ; C08G69/26 ; C08G69/72
摘要:
Polyimides displaying low color in thin films, atomic oxygen resistance, vacuum ultraviolet radiation resistance, solubility in organic solvents in the imide form, high glass transition (Tg) temperatures, and high thermal stability are provided. The poly(amide acid)s, copoly(amide acid)s, polyimides and copolyimides are prepared by the reaction of stoichiometric ratios of an aromatic dianhydride with diamines which contain phenylphosphine oxide groups in polar aprotic solvents. Controlled molecular weight oligomeric (amide acid)s and imides can be prepared by offsetting the stoichiometry according to the Carothers equation using excess diamine and endcapping with aromatic anhydrides The polyimide materials can be processed into various material forms such as thin films, fibers, foams, threads, adhesive film, coatings, dry powders, and fiber coated prepreg, and uses include thin film membranes on antennas, second-surface mirrors, thermal optical coatings, and multi-layer thermal insulation (MLI) blanket materials.