Conformation and Polarization for Monodisperse Oligomers and Polymers of Poly(aryl ether ketone)s in Solution

Abstract

Abstract: By means of ab initio method the dihedral angle of 44° for 4, 4' -difluorobenzophenone and of 51° for MES₃ are obtained.UVspectra frorn monodisperse oligomers and their molecular polarization in H₂SO₄ show that the protonation of H₂SO₄ acting on carbonyl group is one of the major factors of the polarization.The protonation produces a new absorption peak at λ=4OOnm or so (UV); Meanwhile, the overlapping of planar conformation from polarization produces another new absorption peak at λ=500 nm.Based on the protonation model, the configuration interaction(CI) calculation on it is made, the results of which are ln good agreement with those from experiment.All these prove that the absorption peak at λ=4OOnm for poly (aryl ether ketone)s is resulted from carbonyl polarization.Thus, the polymer molecular weight measured in H₂SO₄ should be corrected according to ketone content in the main chain.

Key words: Conformation, Protonation, Polarization, Configuration interaction calculation

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KE Yang-Chuan, FENG Ji-Kang, REN Ai-Min, ZHENG Yu-Bin, WU Zhong-Wen. Conformation and Polarization for Monodisperse Oligomers and Polymers of Poly(aryl ether ketone)s in Solution[J]. Chem. J. Chinese Universities, 1997, 18(3): 418.

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Conformation and Polarization for Monodisperse Oligomers and Polymers of Poly(aryl ether ketone)s in Solution

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