Abstract: To Characterize the molecular structure of oligomers and polymers of Poly(aryl ether ketone)s family,this paper presents a series of Chain-extended monomers and mono-dispersed Oligomers.The comparison researches on these compounds dissolved in DMSO-d₆(or DMSO-d₆+CDCl₃) and H₂SO₄-d₂(or H₂SO₄) are made by ¹³C NMR method.Results show that, in H₂SO₄, their molecular structures are greatly polarized.Results from quantum mechanical calculation and dynamic ¹³C NMR show that this polarization results from the charge unlocalization of bridge-bonds and aryl-rings in molecular chain induced by sulfo-group of H₂SO₄,but not from the reaction of sulfo-group.The Polarization route for the titled compounds are firstly suggested.

Key words: Chain-extended monomers and monodispersed oligomers of poly (aryl ether ketone)s, Molecular polarization, ¹³C NMR, Quantum mechanical calculation