| 摘要 |
Heat stable polyimide and polyamic acid precursor polymers having excellent flow properties which render them more readily processible into fibers, films, sheets and other molded articles. The polymers are prepared by forming the polycondensation product of one or more aromatic diamines and one or more aromatic dianhydride monomers, at least one of said diamine monomers having the structure: <CHEM> wherein R is CF3 or phenyl. The polyimides of this invention exhibit improved solubility and low temperature flow characteristics, low moisture uptake, high thermal stability, low dielectric constant and good hydrolytic stability. |
