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DC Field | Value | Language |
---|---|---|
dc.citation.endPage | 9063 | - |
dc.citation.number | 26 | - |
dc.citation.startPage | 9057 | - |
dc.citation.title | MACROMOLECULES | - |
dc.citation.volume | 39 | - |
dc.contributor.author | Choi, Ja-Young | - |
dc.contributor.author | Tan, Loon-Seng | - |
dc.contributor.author | Baek, Jong-Beom | - |
dc.date.accessioned | 2023-12-22T09:39:51Z | - |
dc.date.available | 2023-12-22T09:39:51Z | - |
dc.date.created | 2014-09-15 | - |
dc.date.issued | 2006-12 | - |
dc.description.abstract | Hyperbranched poly(ether ketone)s (PEK's) were synthesized via A 3 + 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. | - |
dc.identifier.bibliographicCitation | MACROMOLECULES, v.39, no.26, pp.9057 - 9063 | - |
dc.identifier.doi | 10.1021/ma0614996 | - |
dc.identifier.issn | 0024-9297 | - |
dc.identifier.scopusid | 2-s2.0-33846307127 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/6044 | - |
dc.identifier.url | http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=33846307127 | - |
dc.identifier.wosid | 000242935400030 | - |
dc.language | 영어 | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | Self-controlled synthesis of hyperbranched poly(ether ketone)s from A(3)+B-2 approach via different solubilities of monomers in the reaction medium | - |
dc.type | Article | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordPlus | MULTIWALLED CARBON NANOTUBES | - |
dc.subject.keywordPlus | AROMATIC POLYAMIDE | - |
dc.subject.keywordPlus | A(2)+B-3 APPROACH | - |
dc.subject.keywordPlus | TRIMESIC ACID | - |
dc.subject.keywordPlus | POLYMERS | - |
dc.subject.keywordPlus | POLYMERIZATION | - |
dc.subject.keywordPlus | POLYCONDENSATION | - |
dc.subject.keywordPlus | POLYIMIDES | - |
dc.subject.keywordPlus | NANOFIBERS | - |
dc.subject.keywordPlus | DENDRIMERS | - |
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