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Author

Baek, Jong-Beom
Center for Dimension-Controllable Organic Frameworks
Research Interests
  • Covalent Organic Frameworks (COFs), Carbon Nanotubes(CNTs), graphene, Energy Conversion and Storage

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Synthesis of linear and hyperbranched poly(etherketone)s containing flexible oxyethylene spacers

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Title
Synthesis of linear and hyperbranched poly(etherketone)s containing flexible oxyethylene spacers
Author
Jeon, In-YupTan, Loon-SengBaek, Jong-Beom
Keywords
Electrophilic substitution reaction; High performance polymers; Hyperbranched; Linear; Poly(etherketone); Polyphosphoric acid
Issue Date
200711
Publisher
WILEY-BLACKWELL
Citation
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, v.45, no.22, pp.5112 - 5122
Abstract
As an alternative to strong acid reaction media for the Friedel-Crafts acylation for a polymer-forming reaction, a mild polyphosphoric acid (PPA) with optimized amount of phosphorous pentoxide (P 2O 5) has been tested for the polymerization of AB monomers 4-(2-phenoxyethoxy)benzoic acid and 3-(2-phenoxyethoxy) benzoic acid, and an AB 2 monomer 3,5-bis(2-phenoxyethoxy)benzoic acid. The reaction progress of AB 2 monomer was conveniently traced by FTIR spectroscopy monitoring aromatic ketone (C=O) stretching bands arisen from carboxylic acid groups at the chain ends and carbonyl groups in the backbone as a function of reaction time at 110°C. The resultant linear and hyperbranched polymers containing flexible oxyethylene spacers, which were prone to be hydrolyzed in strong acids at elevated temperature, displayed high intrinsic viscosities. Thus, the reaction medium PPA/P 2O 5 mixture as an electrophilic substitution reaction was indeed benign not to depolymerize growing polymer molecules but strong enough for the direct generation of carbonium ion from carboxylic acid to promote efficient polymerization. The resultant hyperbranched poly(etherketone) (PEK) displayed the best solubility among samples. All PEKs showed good thermal stability; glass transition temperatures were in the range of 90-117°C; 5% weight loss generally occurred at greater than 345°C in air.
URI
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DOI
http://dx.doi.org/10.1002/pola.22253
ISSN
0887-624X
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