Synthesis, characterization, and cure of allyl and propargyl functionalized indene as a thermoset composite matrix resin

✍ Scribed by Lon J. Mathias; Gregory J. Tregre

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 169 KB
• Volume: 68
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19980418)68:3<475::aid-app13>3.0.co;2-u

✦ Synopsis

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 320ЊC for AL resin and 282ЊC for PL resin. Thermal degradation of cured AL resin was found to begin at approximately 400ЊC with a carbon yield of 20% of its initial weight at 1000ЊC. Carbon yields for cured PL resin were excellent, with 68% retention of weight at 1000ЊC. 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.