| 摘要 |
An amphiphilic polyimide precursor having at least 70% by mole of the recurring unit of the formula (1): <IMAGE> (1) wherein R1 is a tetravalent group having at least 2 carbon atoms, R2 is a bivalent group having at least 2 carbon atoms, and R3, R4, R5 and R6 are hydrogen atom or a monovalent group having 1 to 30 carbon atoms selected from an aliphatic group, an alicyclic group, an aromatic group, a group in which an aliphatic group is combined with an alicyclic group or an aromatic group, and their groups substituted by a halogen atom, nitro group, amino group, cyano group, methoxy group or acetoxyl group, provided that at least one, preferably at least two, of R3, R4, R5 and R6 are hydrophobic monomolecular groups having 12 to 30 carbon atoms, the polyamide precursor being able to form a built-up film on substrates according to the Langmuir-Blodgett technique and being able to be converted into polyimide by heat treatment to provide an ultrathin film of of polyimide having a thickness of not more than 10,000 ANGSTROM and excellent heat resistance, chemical resistance, mechanical property and electric characteristics.
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