Citation:
LU Dandan, WANG Zhipeng, WANG Honghua, ZHOU Guangyuan, CUI Shanzi. Synthesis and Ring-Opening Polymerization of Cyclic Phenolphthalein Poly(ether ketone ketone) Oligomers[J]. Chinese Journal of Applied Chemistry,
;2014, 31(12): 1378-1383.
doi:
10.3724/SP.J.1095.2014.40063
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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 ringopening 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).
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