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- W2062058078 abstract "Hyperbranched poly(ether ketone)s (PEK's) were synthesized via A3 + B2 polymerization approach without forming cross-linked products, because the polymer-forming process based on Friedel−Crafts reaction was kinetically controlled by the solubility difference of monomers in the viscous hydrophilic reaction medium, poly(phosphoric acid) (PPA)/phosphorus pentoxide (P2O5). The hydrophilic trimesic acid as an A3 monomer is soluble in the reaction medium, while hydrophobic diphenyl ether and 1,4-diphenoxybenzene as B2 monomers are marginally soluble. It is hypothesized that the gelation was avoided because of the following two factors: (i) self-regulated feeding of the arylether monomers into the system driven by their poor solubility and phase separation from PPA/P2O5 medium; (ii) reaction-medium-induced isolation of growing macromolecules promoted by the high bulk viscosity. Both polymerization experiments based on equimolar or equifunctional stoichiometry (A3:B2) resulted in completely soluble hyperbranched PEK's in polar aprotic solvents when these polymers contained a little amount of solvent residues and only in strong acids if they were rigorously dried. The structural analysis by using MALDI−TOF mass spectroscopy in the low molar mass region provided further confirmation that there was no trace of networks; various sizes of cyclics were detected instead." @default.
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- W2062058078 date "2006-12-01" @default.
- W2062058078 modified "2023-10-16" @default.
- W2062058078 title "Self-Controlled Synthesis of Hyperbranched Poly(ether ketone)s from A<sub>3</sub> + B<sub>2</sub> Approach via Different Solubilities of Monomers in the Reaction Medium" @default.
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- W2062058078 doi "https://doi.org/10.1021/ma0614996" @default.
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