Synthesis, Characterization, and Cure of Allyl and Propargyl Functionalized Indene as a Thermoset Composite Matrix Resin

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Polymers and High Performance Materials


Two highly functionalized resins were synthesized by the phase transfer reaction of indene with propargyl bromide or allyl chloride in the presence of strong base. The resins consisted of a mixture of tri-and tetrafunctional indenes with 60-80% of the product being tetrafunctional. The allylated (AL) and propargylated (PL) indene resins were thermally cured without added catalysts. Both resins exhibited a broad, highly exothermic cure with a peak energy at 320 degrees C for AL resin and 282 degrees C for PL resin. Thermal degradation of cured AL resin was found to begin at approximately 400 degrees C with a carbon yield of 20% of its initial weight at 1000 degrees C. Carbon yields for cured PL resin were excellent, with 68% retention of weight at 1000 degrees C. Unidirectional, carbon fiber composites were fabricated from the substituted indene resins. AL-carbon fiber composites gave modulus values of 126 GPa and strength values of 967 MPa, while PL-carbon fiber composites gave modulus values of 116 GPa and strength values of 935 MPa in three-point bending tests. (C) 1998 John Wiley & Sons, Inc.

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Journal of Applied Polymer Science





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