Hyperbranched poly(ether ketone) analogues with heterocyclic triazine moiety: Synthesis and peripheral functionalization

Citation
Sy. Cho et al., Hyperbranched poly(ether ketone) analogues with heterocyclic triazine moiety: Synthesis and peripheral functionalization, MACRO CH P, 202(2), 2001, pp. 263-269
Citations number
39
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
MACROMOLECULAR CHEMISTRY AND PHYSICS
ISSN journal
1022-1352 → ACNP
Volume
202
Issue
2
Year of publication
2001
Pages
263 - 269
Database
ISI
SICI code
1022-1352(20010208)202:2<263:HPKAWH>2.0.ZU;2-N
Abstract
Hyperbranched poly(ether ketone) with 1,3,5-s-triazine moiety was prepared by a one-pot polymerization of an AB(2) type monomer, 2,4-bis(4-hydroxyphen yl)-6-(4-(4-(4-fluorobenzoyl)phenoxy)phenyl)-1,3,5-s-triazine, which was sy nthesized from cyanuric chloride. The selective reactivity of three chlorin e atoms on cyanuric chloride toward nucleophiles provides a very efficient route for the systematic synthesis of AB(2) type triazine monomers and thei r hyperbranched polymers. The resulting polymers exhibited a glass transiti on at 264 degreesC without any indication of crystallinity. The modificatio n of the peripheral hydroxyl groups on the hyperbranched polymers by methox y, oligoethyleneoxy, or stearyl moieties brought about remarkable changes i n their solubility and glass transition temperatures. The amphiphilic natur e of the 2[2-(2-(2- methoxyehtoxy)ethoxy)ethoxy]ethoxy-terminated poly(ethe r ketone) analogue in an aqueous phase was investigated by using fluorescen ce techniques and dynamic light scattering. It was found that the analogue forms a self-aggregation at a critical aggregation concentration of 12.6 mg /L. The mean diameter of the aggregates was 320 nm. The steady-state fluore scence anisotropy value (r) of 1,6-diphenyl-1,3,5-hexatriene (DPH) in the h ydrophobic domain was 0.240.