BROWSE

Related Researcher

Author's Photo

Kim, Kyoung Taek
KT Kim Group at UNIST
Research Interests
  • Polymer Chemistry
  • Organic Chemistry
  • Supramolecular Chemistry
  • Biopolymers

ITEM VIEW & DOWNLOAD

Synthesis and micellar characterization of an amphiphilic diblock copolyphosphazene

Cited 59 times inthomson ciCited 59 times inthomson ci
Title
Synthesis and micellar characterization of an amphiphilic diblock copolyphosphazene
Author
Chang, YLee, SCKim, Kyoung TaekHim, CReeves, SDAllcock, HR
Keywords
BLOCK-COPOLYMER MICELLES; LIVING CATIONIC POLYMERIZATION; AMBIENT-TEMPERATURE SYNTHESIS; FLUORESCENCE PROBE; DRUG-DELIVERY; POLYPHOSPHAZENES; OXIDE); PHOSPHORANIMINES; L-ASPARTATE); WATER
Issue Date
2001-01
Publisher
AMER CHEMICAL SOC
Citation
MACROMOLECULES, v.34, no.2, pp.269 - 274
Abstract
An amphiphilic polyphosphazene diblock copolymer (MEEP-Ph/MEEP) based on [N double bond P(OCH2CH2OCH2CH2OCH3)2]n (MEEP) as a hydrophilic block and [N double bond PPh(OCH2CH2OCH2CH2OCH3)]m (Ph/MEEP) as a hydrophobic block was synthesized via the controlled cationic block copolymerization of phosphoranimine. The molecular weight of the block copolymer was estimated by GPC to be 3300. The molar composition ratio of repeating unit in the MEEP block to those in the Ph/MEEP block was 0.5. The micellar characterization of MEEP-Ph/MEEP in an aqueous phase was carried out by using fluorescence techniques, dynamic light scattering, and TEM. The block copolymer formed micelles with a critical micelle concentration (cmc) of 80 mg/L. The hydrodynamic radius (Rh) of micelles, measured by dynamic light scattering, was 120 nm at 25 °C with a narrow distribution. The TEM image showed micelles with a spherical shape. Intermicellar aggregation was induced in the micellar solution of the block copolymer above 57 °C. The partition equilibrium constant, Kv, of pyrene in the micellar solution of the block copolymer was 7.0×103. The steady-state fluorescence anisotropy value (r) of-1,6-diphenyl-1,3,5-hexatriene (DPH) was 0.237. The fluorescence lifetime value for DPH in the block copolymer solution showed that the core region of the micelles consisted of two regions with different hydrophobicities.
URI
Go to Link
DOI
10.1021/ma992036l
ISSN
0024-9297
Appears in Collections:
PHY_Journal Papers
Files in This Item:
2-s2.0-0034819109.pdf Download

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU