Development of Carborane Chemistry

Catalytic Polymerization of Phthalonitrile Resins by Carborane with Enhanced Thermal Oxidation Resistance: Experimental and Molecular Simulation

“…The phthalocyanine rings formed during the curing reaction of BPh-Q 10 was further confirmed by UV-vis spectra ( Figure 6 ). Two reflection peaks at 680 nm and 710 nm were ascribed to the Q-band characteristic peaks of the phthalocyanine rings [ 28 ]. Moreover, no obvious change was observed for the FTIR spectrum of BPh-Q 10 cured at 350 °C compared with that at 320 °C.…”

“…This could be explained by the following reasons: carbon and boron atoms in carborane both were six-ligand, obeying Hückel’s rule and exhibited aromaticity, which caused low energy of the B-H bond. The cage structure of carborane made the boron atoms on neighboring carbon atoms be slightly positive and prone to occur nucleophilic substitution reactions [ 28 ]. Therefore, when curing with QCB catalyzers, a large number of reaction intermediates were generated and the rate of cyclization of the intermediates was further enhanced.…”

“…As a polyhedral cage boron cluster compound, carborane was formed when some boron atoms in the cluster were replaced by carbon atoms [ 26 ]. This particular structure endowed the carborane molecules and their derivatives with aromatic properties and good thermal stability [ 27 , 28 ]. 1,7-bis(hydroxymethyl)-m-carborane (QCB) introduces hydroxyl methyl to two C atoms of carborane ( Figure 1 ).…”