Preparation and aromatization of poly‐1,3‐cyclohexadiene and subsequent crosslinking. III

The polymerization of 1,3‐cyclohexadiene with n‐butyllithium has given white polymers with inherent viscosities up to 0.23 and conversions to 98%. Bromination and pyrolysis of these polymers lead to polyphenyls which can be successfully sulfonated. then fused in molten alkali to give phenols, and finally crosslinked with formaldehyde. The final products display good heat stability, in that there is no weight loss on heating to 400°C. and only 30% loss at 900°C.