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Thermal and Radiation Curing of Phenylethynyl Terminated Macromers
Polymer Materials and Radiation Group, Chemistry Department, University of Queensland, Australia
Centre for Magnetic Resonance, University of Queensland, Australia
NASA Langley Research Center, Hampton, VA, USA The thermal and gamma-irradiation induced curing of two phenylethynyl terminated composite resin systems, DFB/BPF and PETI5A, was investigated. Thermal curing of these matrix resin samples was performed at a temperature of 360 °C, gamma irradiation of the samples was conducted at 300 °C at a dose rate of 2.2 kGy h–1. The reaction and subsequent loss of ethynyl groups in the resins for both cure methods was demonstrated by observing the decrease of the 2215 cm–1 peak in the Raman spectra of the resins. Fully cured resin samples were found to have glass transition temperatures of 244–246 °C and 278–280 °C for DFB/BPF and PETI5A respectively. Similar relationships between Tg and fractional conversion were observed in both resins. The apparent polymerization rate, Rp, for thermal cure at 360 °C, was found to be 4:79 x 10–22%s–1 in PETI5A and 3.22 x 10–2%s–1 in DFB/BPF. Catastrophic degradation under nitrogen was observed to commence near 450 °C and 530 °C, with 5% weight losses occurring at 455 °C and 540 °C for DFB/BPF and PETI5A respectively. Gamma radiation induced cure at 300 °C was shown to be feasible, with full cure being reached with doses of 40 kGy for DFB/BPF and 100 kGy for PETI5A.
High Performance Polymers, Vol. 11, No. 4,
453-465 (1999) |
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