High-performance Composites Based on All-aromatic Liquid Crystal Thermosets
Résumé
In this study, a new high-performance liquid crystal ester-based thermoset for composite applications was investigated. All-aromatic liquid crystalline thermosets (LCTs) are a promising class of polymers that offer a unique combination of properties such as solvent resistivity, high modulus, high strength, low coefficient of thermal expansion and high after-cure glass-transition temperatures (T ⩾ 150 C). Fully cured LCTs offer superior thermo-mechanical properties over high-performance thermoplastic polymers such as PPS, PEEK and PEI. For this study we used a 9000 g.mol ester-based LCT based on cheap and readily available monomers, . 4-hydroxybenzoic acid (H), isophthalic acid (I) and hydroquinone (Q), abbreviated by us as HIQ-9. Composite panels prepared from T300 carbon fiber (5-harness satin weave) showed in-plane shear strength of 154 MPa and an in-plane shear modulus of 3.7 GPa. The tensile strength and modulus were measured to be 696 MPa and 57 GPa, respectively. A inspection showed that the interfacial strength was excellent and no delamination was observed in the test specimen. Preliminary results show that LCT based composites exhibit a better combination of (thermo)mechanical properties over PPS and PEI based composites.
Domaines
Matériaux
Fichier principal
PEER_stage2_10.1016%2Fj.compscitech.2011.01.030.pdf (1.31 Mo)
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