Effect of architecture on the micellar properties of amphiphilic block copolymers: Comparison of AB linear diblock, A1A2B, and A2B heteroarm star block copolymers

Jongpil Yun, Rudolf Faust, László Sz Szilágyi, S. Kéki, M. Zsuga

Research output: Article

68 Citations (Scopus)

Abstract

Amphiphilic AB, A1A2B, and A2B block copolymers, where A = polyisobutylene, B = poly-(methyl vinyl ether), and the superscripts denote molecular weight asymmetry, with constant molecular weight and composition have been synthesized by living cationic polymerization. The influence of architecture on aqueous micellar properties of these block copolymers were investigated in the temperature range 20-30 °C by fluorescence spectroscopy and static and dynamic light scattering (SLS and DLS). The critical micelle concentration (cmc) measured at 23 °C increased in the order A2B <A1A2B <AB. The partition equilibrium constants, Kv of pyrene, characteristic of hydrophobicity, increased in the opposite order of cmc. The hydrodynamic radii (Rh) and aggregation numbers (Nagg) of micelles remained approximately constant in the whole temperature range for A1A2B and A2B and below 25 °C for AB. At ∼25 °C, however, there was a sudden increase in both Rh and Nagg for AB. Below 25 °C both Rh and Nagg increased in the order AB <A1A2B <A2B. The particle size distribution for all block copolymers remained narrow in the whole temperature range. The results are discussed in terms of possible morphologies.

Original languageEnglish
Pages (from-to)1717-1723
Number of pages7
JournalMacromolecules
Volume36
Issue number5
DOIs
Publication statusPublished - márc. 11 2003

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Block copolymers
Stars
Critical micelle concentration
Molecular weight
Cationic polymerization
Living polymerization
Pyrene
Equilibrium constants
Fluorescence spectroscopy
Micelles
Dynamic light scattering
Hydrophobicity
Particle size analysis
Temperature
Ethers
Agglomeration
Hydrodynamics
Chemical analysis
poly(vinyl methyl ether)
pyrene

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

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title = "Effect of architecture on the micellar properties of amphiphilic block copolymers: Comparison of AB linear diblock, A1A2B, and A2B heteroarm star block copolymers",
abstract = "Amphiphilic AB, A1A2B, and A2B block copolymers, where A = polyisobutylene, B = poly-(methyl vinyl ether), and the superscripts denote molecular weight asymmetry, with constant molecular weight and composition have been synthesized by living cationic polymerization. The influence of architecture on aqueous micellar properties of these block copolymers were investigated in the temperature range 20-30 °C by fluorescence spectroscopy and static and dynamic light scattering (SLS and DLS). The critical micelle concentration (cmc) measured at 23 °C increased in the order A2B <A1A2B <AB. The partition equilibrium constants, Kv of pyrene, characteristic of hydrophobicity, increased in the opposite order of cmc. The hydrodynamic radii (Rh) and aggregation numbers (Nagg) of micelles remained approximately constant in the whole temperature range for A1A2B and A2B and below 25 °C for AB. At ∼25 °C, however, there was a sudden increase in both Rh and Nagg for AB. Below 25 °C both Rh and Nagg increased in the order AB <A1A2B <A2B. The particle size distribution for all block copolymers remained narrow in the whole temperature range. The results are discussed in terms of possible morphologies.",
author = "Jongpil Yun and Rudolf Faust and Szil{\'a}gyi, {L{\'a}szl{\'o} Sz} and S. K{\'e}ki and M. Zsuga",
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T1 - Effect of architecture on the micellar properties of amphiphilic block copolymers

T2 - Comparison of AB linear diblock, A1A2B, and A2B heteroarm star block copolymers

AU - Yun, Jongpil

AU - Faust, Rudolf

AU - Szilágyi, László Sz

AU - Kéki, S.

AU - Zsuga, M.

PY - 2003/3/11

Y1 - 2003/3/11

N2 - Amphiphilic AB, A1A2B, and A2B block copolymers, where A = polyisobutylene, B = poly-(methyl vinyl ether), and the superscripts denote molecular weight asymmetry, with constant molecular weight and composition have been synthesized by living cationic polymerization. The influence of architecture on aqueous micellar properties of these block copolymers were investigated in the temperature range 20-30 °C by fluorescence spectroscopy and static and dynamic light scattering (SLS and DLS). The critical micelle concentration (cmc) measured at 23 °C increased in the order A2B <A1A2B <AB. The partition equilibrium constants, Kv of pyrene, characteristic of hydrophobicity, increased in the opposite order of cmc. The hydrodynamic radii (Rh) and aggregation numbers (Nagg) of micelles remained approximately constant in the whole temperature range for A1A2B and A2B and below 25 °C for AB. At ∼25 °C, however, there was a sudden increase in both Rh and Nagg for AB. Below 25 °C both Rh and Nagg increased in the order AB <A1A2B <A2B. The particle size distribution for all block copolymers remained narrow in the whole temperature range. The results are discussed in terms of possible morphologies.

AB - Amphiphilic AB, A1A2B, and A2B block copolymers, where A = polyisobutylene, B = poly-(methyl vinyl ether), and the superscripts denote molecular weight asymmetry, with constant molecular weight and composition have been synthesized by living cationic polymerization. The influence of architecture on aqueous micellar properties of these block copolymers were investigated in the temperature range 20-30 °C by fluorescence spectroscopy and static and dynamic light scattering (SLS and DLS). The critical micelle concentration (cmc) measured at 23 °C increased in the order A2B <A1A2B <AB. The partition equilibrium constants, Kv of pyrene, characteristic of hydrophobicity, increased in the opposite order of cmc. The hydrodynamic radii (Rh) and aggregation numbers (Nagg) of micelles remained approximately constant in the whole temperature range for A1A2B and A2B and below 25 °C for AB. At ∼25 °C, however, there was a sudden increase in both Rh and Nagg for AB. Below 25 °C both Rh and Nagg increased in the order AB <A1A2B <A2B. The particle size distribution for all block copolymers remained narrow in the whole temperature range. The results are discussed in terms of possible morphologies.

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