Oligomeric phthalonitriles and tetrakis(phenylethynyl)benzene blends with improved processing and thermal properties |
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| Authors: | Tristan Butler Sasha E. Alden Madeleine Taylor Stephen Deese David A. Rider Matthew Laskoski |
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| Affiliation: | 1. Chemistry Division, Materials Chemistry Branch, Code 6127, Naval Research Laboratory, Washington, DC, 20375-5320;2. Chemistry Department, Western Washington University, 516 High Street, Bellingham, WA, 98225 Department of Engineering and Design, Western Washington University, 516 High Street, Bellingham, WA, 98225 |
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| Abstract: | Blended resins were prepared from the resorcinol-based PEEK-like oligomeric phthalonitrile resin (RES) and tetrakis(phenylethynyl)benzene (TPEB), a high char yield arylacetylene resin. Initial probing of curing properties using differential scanning calorimetry, indicated that TPEB and RES co-cure when heated. Characterization of thermal properties using thermogravimetric analysis indicated that a 1:1 TPEB-RES blend (by weight) exhibited a char yield of 80% which was 6% larger compared to pure RES (74%). According to FTIR characterization, the enhanced thermal properties of TPEB-RES were the result of increased crosslinking density. Rheological studies of TPEB, RES, and TPEB-RES blends indicated that blended systems exhibit similar processing characteristics as RES resin. For example, resins display ideal viscosities and relatively large processing windows when cured at 175 °C. Alternatively, pure TPEB resin exhibits low viscosities when melted, which are not suitable for preparing composite materials. This study indicates that preparing TPEB-RES blends is an effect strategy for improving thermal performance of potential RES composites while still maintaining the required processability for fabrication of dense polymer composites. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56, 2630–2640 |
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| Keywords: | blends high temperature materials processing thermosets |
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