Abstract
The high melting point of high-temperature resistant phthalonitrile resin is often prone to defects in traditional hot melt manufacturing. And its high cross-linking density leads to poor toughness of the resin. In this work, we report for the first time a novel densifying processing, powder hot isostatic pressing (PHIP), for phthalonitrile resin with low defect and high mechanical performance. The bending strength and impact strength of the pure phthalonitrile resin (PBAPN) by PHIP reached to 108.5 MPa and 9.1 kJ·m−2, respectively, increasing by 186.3% and 405.6% than PBAPN by hot melt method. The epoxycyclohexyl polyhedral oligomeric silsesquioxane (EP-POSS) with excellent heat resistance was used to achieve synchronous improvement of thermal and mechanical properties of phthalonitrile resin. The bending strength and impact strength of the phthalonitrile resin containing 1 wt% POSS (PBAPNPOSS-1) further increased to 120.1 MPa and 13.0 kJ·m−2. In addition, the glass transition temperature of PBAPNPOSS-5 increased by 40 °C compared with PBAPN.
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