Bis(trialkylsiloxyphenyl)-arylfluoride imide AB2 monomers, hyperbranched polymers and nanoclay composites therefrom
申请人:The United States of America as represented by the Secretary of the Air Force
公开号:US08138257B1
公开(公告)日:2012-03-20
Novel aromatic AB2 imide monomer with thermally reactive trialkylsiloxy and aryl fluoride moieties, which can be polymerized to form hyperbranched aromatic polyimides in the presence of a metal fluoride catalyst. Nanoclay composites were generated by either (i) direct blending of a preformed hyperbranched aromatic polyimide and Closite nanoclay (≦20 wt %) or (ii) blending of the AB2 monomer, CsF catalyst and Closite nanoclay (≦20 wt %) followed by thermal solid-state polymerization of the AB2 monomer homogeneously dispersed in the nanoclay.
具有热反应性三烷基硅氧和芳基氟官能团的新型芳香族AB2咪唑单体,可以在金属氟化物催化剂的存在下聚合形成高支化芳香族聚酰亚胺。可以通过以下两种方式生成纳米粘土复合材料:(i)将预制的高支化芳香族聚酰亚胺和Closite纳米粘土(≦20 wt %)直接混合;(ii)混合AB2单体、CsF催化剂和Closite纳米粘土(≦20 wt %),然后在纳米粘土中均匀分散的AB2单体进行热固态聚合。