Kim, C Lee, SC Shin, JH Kwon, IC Jeong, SY 2024-01-21T13:14:53Z 2024-01-21T13:14:53Z 2021-09-05 2000-10-03 0024-9297 https://pubs.kist.re.kr/handle/201004/141010 Amphiphilic diblock copolymers with various block compositions were synthesized on the basis of poly(2-ethyl-2-oxazoline) (PEtOz) as a hydrophilic block and poly(1,3-trimethylene carbonate) (PTMC) as a hydrophobic block. Their aqueous solutions were characterized using fluorescence techniques and dynamic light scattering. The block copolymers formed micelles with critical micelle concentrations (cmc&apos;s) in the range 2.8-25 mg/L in an aqueous phase. As the length of the hydrophobic PTMC block became longer, lower cme values were generated. The mean diameters of the micelles were in the range 199-210 nm, with a narrow distribution. The partition equilibrium constants (K-v) of pyrene in the micellar solutions of the block copolymers were 0.91 x 10(5)-1.61 x 10(5). The K-v value increased as the length of the hydrophobic block increased. The steady-state fluorescence anisotropy values (r) of 1,6-diphenyl-1,3,5-hexatriene (DPH) in PEtOz-PTMC solutions were 0.292-0.302. The anisotropy values were not significantly influenced by the length of the hydrophobic block. The micelles underwent hydrogen bonding at pH < 3.6 with poly(acrylic acid) resulting in polymer complex precipitates, which could be reversibly dispersed as micelles at pH > 3.9. English AMER CHEMICAL SOC NONIONIC POLYMER SURFACTANT POLYION COMPLEX MICELLES ACID) BLOCK-COPOLYMER CYCLIC IMINO ETHERS POLY(ETHYLENE OXIDE) FLUORESCENCE PROBE AQUEOUS-SOLUTIONS ENERGY-TRANSFER DRUG-DELIVERY WATER Amphiphilic diblock copolymers based on poly(2-ethyl-2-oxazoline) and poly(1,3-trimethylene carbonate): Synthesis and micellar characteristics Article 10.1021/ma000517v 1 MACROMOLECULES, v.33, no.20, pp.7448 - 7452 MACROMOLECULES 33 20 7448 7452 scie scopus 000089735800031 2-s2.0-0034299564 Polymer Science Polymer Science Article NONIONIC POLYMER SURFACTANT POLYION COMPLEX MICELLES ACID) BLOCK-COPOLYMER CYCLIC IMINO ETHERS POLY(ETHYLENE OXIDE) FLUORESCENCE PROBE AQUEOUS-SOLUTIONS ENERGY-TRANSFER DRUG-DELIVERY WATER amphiphilic diblock copolymers poly(2-ethyl-2-oxazoline) phase transition behavior micelle