Abstract New crosslinkable telechelics containing benzoxazine moiety at the chain end have been synthesized using oligomeric bisphenols with aromatic ether structure. The chain length of the oligomer is estimated from the size exclusion chromatography and proton nuclear magnetic resonance spectroscopy ( 1H NMR). The degree of end-capping by benzoxazine moieties, that is estimated from 1H NMR spectrum, increases during 24 h of the reaction. The telechelic is used to cast polybenzoxazine films with excellent thermal stability. Mechanical and chemical properties of these films are studied as a function of the degree of end-capping.