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


Self-Controlled Synthesis of Hyperbranched Poly(ether-ketone)s from A(2) + B-3 Approach in Poly(phosphoric acid)

DC Field Value Language Jeon, In-Yup ko Tan, Loon-Seng ko Baek, Jong-Beom ko 2014-04-10T01:14:16Z - 2013-06-05 ko 2009-07 -
dc.identifier.citation JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, v.47, no.13, pp.3326 - 3336 ko
dc.identifier.issn 0887-624X ko
dc.identifier.uri -
dc.identifier.uri ko
dc.description.abstract Self-controlled synthesis of hyperbranched poly(ether-ketone)s (HPEKs) were prepared from "A(2) + B-3" approach by using different monomer solubility in reaction medium. 1,3,5-Triphenoxybenzene as a hydrophobic 13,3 monomer was reacted with commercially available terephthalic acid or 4,4'-oxybis(benzoic acid) as a hydrophilic A(2) monomer in a hydrophilic reaction medium, polyphosphoric acid (PPA)/phosphorous pentoxide (P2O5). The resultant HPEKs were soluble in various common organic solvents and had the weight-average molecular weight in the range of 3900-13,400 g/mol. The results implied that HPEKs were branched structures instead of crosslinked polymers. The molecular sizes and shapes of HPEKs were further assured by morphological investigation with scanning electron microscopy (SEM) and atomic force microscopy (AFM). Hence, the applied polymerization condition was indeed strong enough to efficiently facilitate polycondensation via "direct" Friedel-Crafts reaction without gelation. It could be concluded that the polymer forming reaction was kinetically controlled by automatic and slow feeding of the hydrophobic B-3 monomer into the hydrophilic reaction mixture containing hydrophilic comonomer. As a result, hyperbranched structures were formed instead of crosslinked polymers even at full conversion (equifunctional monomer feed ratio). ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher WILEY-BLACKWELL ko
dc.subject Friedel-crafts acylation ko
dc.subject High performance polymer ko
dc.subject Hyperbranched polymer ko
dc.subject Poly(ether-ketone)s ko
dc.subject Poly(phosphoric acid) ko
dc.title Self-Controlled Synthesis of Hyperbranched Poly(ether-ketone)s from A(2) + B-3 Approach in Poly(phosphoric acid) ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-67650076851 ko
dc.identifier.wosid 000267567100011 ko
dc.type.rims ART ko
dc.description.wostc 1 *
dc.description.scopustc 1 * 2015-02-28 * 2014-08-25 *
dc.identifier.doi 10.1002/pola.23402 ko
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