A series of phenylethynyl-terminated imide oligomers were prepared by the reaction of aromatic dianhydride(s) with a stoichiometric excess of aromatic diamine(s) at calculated number average molecular weights of 1500-9000gmo1-1 and end-capped with phenylethynylphthalic anhydrides in N-methyl-2- pyrrolidinone. Unoriented thin films cured in flowing air to 350°C exhibited tensile strengths and moduli of 105.5-139.3 MPa and 2.8-3.2GPa at 23°C, respectively, with good retention of properties at 177°C. Stressed film specimens exhibited excellent resistance to a variety of solvents after a 2 week exposure period at ambient temperature. One phenylethynyl-terminated imide oligomer was selected for more extensive evaluation and gave high fracture toughness, adhesive and composite properties. The chemistry, physical and mechanical properties of these materials are discussed.
Посилання на статтю:
Chemistry and properties of imide oligomers end-capped with phenylethynylphthalic anhydrides / P. M. Hergenrother* and J. G. Smith Jr // Polymer. – 1994. – Vol 35. – P. 4857-4864.