Chinese Journal of Applied Chemistry

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Synthesis and Ring-Opening Polymerization of Cyclic Phenolphthalein Poly(ether ketone ketone) Oligomers

LU Dandan1, WANG Zhipeng2, WANG Honghua2, ZHOU Guangyuan2,3, CUI Shanzi1*   

  1. (1.School of Chemical Engineering,Changchun University of Technology,Changchun 130012,China;
    2.Changchun Institute of Applied Chemistry of Sciences,
    Chinese Academy of Sciences,Changchun 130022,China;
    3.Changzhou Institute of Energy Storage Meterials & Devices,Changzhou 213002,China)
  • Received:2014-03-05 Revised:2014-05-11 Published:2014-11-08 Online:2014-11-08
  • Contact: Shan-Zi CUI

Abstract: Under pseudo high dilution conditions, cyclic oligomers of phenolphthalein poly(ether ketone ketone)s(c-PEKK-C) were synthesized from phenolphthalein and 4,4′-difluorotribenzodiketone(DFTBDK) with a cyclization ratio of 78%. MALDI-TOF MS characterization indicates that c-PEKK-C has a broad size distribution(n=2~8) with cyclic dimers and trimers as main components(85%). The molecular structure of DFTBDK is prone to form cyclic structure that can be confirmed by Jacobson-Stockmayer theory. Melt ring-opening polymerization(ROP)(300~350 ℃) of cyclic oligomers catalyzed by potassium 4,4′-biohenol gives the corresponding linear products with high relative molecular mass(Mw 1.2×105).

Key words: aromatic cyclic oligomers, phenolphthalein poly(ether ketone ketone)s, pseudo high dillution technology

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