Properties of Imide Oligomers Containing Pendent Phenylethynyl Groups
- 1 September 1997
- journal article
- Published by SAGE Publications in High Performance Polymers
- Vol. 9 (3), 309-321
- https://doi.org/10.1088/0954-0083/9/3/009
Abstract
As part of a programme to develop high-performance/high-temperature structural resins for aeronautical applications, imide oligomers containing pendent phenylethynyl groups were prepared, characterized, thermally cured and the cured resins evaluated as films, mouldings, adhesives and composites matrices. Initially a diamine containing a pendent phenylethynyl group (3, 5-diamino-4′-phenylethynylbenzophenone) was prepared and characterized. This compound was used to make amide acid and subsequently imide oligomers containing pendent phenylethynyl groups. In order to control the distance between reactive sites, the concentration of pendent phenylethynyl groups was varied randomly along the oligomer backbone. The amide acid oligomers in N-methyl-2-pyrrolidinone were processed into thin films, adhesive tape, carbon fibre prepreg and also converted into imide powder. After initial screening work was performed on unoriented thin films, imidized powders and neat resin mouldings to assess glass transition temperature, mechanical properties (tensile properties and fracture toughness), melt flow behaviour and processability, one particular formulation was scaled up for more comprehensive evaluation. This imide oligomer containing pendent phenylethynyl groups was fabricated into adhesive and composite specimens under 1.4 MPa for1hat 350–371 °C. Excellent mechanical properties were obtained at room temperature and 177 °C. The properties of this material are compared with those of a material of similar composition and molecular weight containing only terminal phenylethynyl groups.Keywords
This publication has 8 references indexed in Scilit:
- Effect of Molecular Weight on Processing and Adhesive Properties of the Phenylethynyl-Terminated Polyimide LARC™-PETI-5The Journal of Adhesion, 1997
- Blends of Reactive Diluents with Phenylethynyl-Terminated Arylene Ether OligomersHigh Performance Polymers, 1996
- Processing and Properties of IM7/PETI CompositesJournal of Composite Materials, 1996
- High-temperature thermoset polyimides containing disubstituted acetylene end groupsPolymer, 1994
- Synthesis and characterization of imide oligomers end-capped with 4-(phenylethynyl)phthalic anhydridesPolymer, 1994
- Chemistry and properties of imide oligomers end-capped with phenylethynylphthalic anhydridesPolymer, 1994
- Polyimides with pendent ethynyl groupsPolymer, 1993
- Synthesis and Characterization of Reactive End-Capped Poiymide OligomersJournal of Macromolecular Science: Part A - Chemistry, 1984