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A series of bio‐based fluorin‐free main‐chain type benzoxazine precursors were synthesized via bisphenol A/bisphenol F/diallyl bisphenol A, Priamine 1074 and paraformaldehyde by Mannich condensation reaction. Chemical structures of these obtained main‐chain type precursors were characterized by FT‐IR and NMR spectroscopies. The polymerization processes were studied by differential scanning calorimeter...
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