Effect of architecture on the micellar properties of amphiphilic block copolymers: Comparison of AB linear diblock, A2B2, A 3B3, and (AB)3 star block copolymers

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

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The influence of architecture on aqueous micellar properties of amphiphilic block copolymers AB-1, A2B2, A3B3, and (AB)3 (A = polyisobutylene (PIB), B = poly(methyl vinyl ether) (PMeVE)), with approximately constant A and B segment lengths, was investigated. A comparison of AB-1 with AB-2 and AB-3 diblock copolymers having similar composition but higher total molecular weight suggested spherical core-shell morphology for AB-3 and vesicles for AB-1 and AB-2. Similarly to AB-1, star block copolymers A2B2, A3B3, and (AB)3 also formed vesicles with unusually high aggregation number (Nagg) and hydrodynamic radius (Rh). The critical micelle concentration (CMC) measured by fluorescence spectroscopy at 20°C increased in the order (AB)3 = AB-1 <A2B2 ∼ A3B3. The temperature dependence of Rh and Nagg has been determined in the temperature range of 20-30°C. Rh and Nagg remained approximately constant in the whole temperature range for A2B2, A3B3, and (AB)3. A substantial increase in both Rh and Nagg occurred at 25°C for AB-1. The particle size distribution for all block copolymers remained narrow in the whole temperature range. Below 25°C, Rh increased in the order (AB)3 <AB-1 <A2B2 <A 3B3 and Nagg increased in the (AB)3 <A3B3 <A2B2 <AB order. The numbers of AB units in the micelles, however, were similar. Micelles of A2B2 and A3B3 consisted of 5600 and 5700 AB units respectively, while these numbers were slightly lower for AB-1 (4500) and (AB)3 (4800).

Original languageEnglish
Pages (from-to)613-627
Number of pages15
JournalJournal of Macromolecular Science - Pure and Applied Chemistry
Volume41 A
Issue number6
DOIs
Publication statusPublished - Jun 2004

Fingerprint

Block copolymers
Stars
Micelles
Temperature
Critical micelle concentration
Fluorescence spectroscopy
Particle size analysis
Ethers
Agglomeration
Hydrodynamics
Molecular weight
Chemical analysis

Keywords

  • Aggregation number
  • Amphiphilic block copolymer
  • Critical micelle concentration
  • Hydrodynamic radius
  • Micelle
  • Polymer architecture

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

Cite this

@article{5821014f86904da0a546d0146c5f69cf,
title = "Effect of architecture on the micellar properties of amphiphilic block copolymers: Comparison of AB linear diblock, A2B2, A 3B3, and (AB)3 star block copolymers",
abstract = "The influence of architecture on aqueous micellar properties of amphiphilic block copolymers AB-1, A2B2, A3B3, and (AB)3 (A = polyisobutylene (PIB), B = poly(methyl vinyl ether) (PMeVE)), with approximately constant A and B segment lengths, was investigated. A comparison of AB-1 with AB-2 and AB-3 diblock copolymers having similar composition but higher total molecular weight suggested spherical core-shell morphology for AB-3 and vesicles for AB-1 and AB-2. Similarly to AB-1, star block copolymers A2B2, A3B3, and (AB)3 also formed vesicles with unusually high aggregation number (Nagg) and hydrodynamic radius (Rh). The critical micelle concentration (CMC) measured by fluorescence spectroscopy at 20°C increased in the order (AB)3 = AB-1 <A2B2 ∼ A3B3. The temperature dependence of Rh and Nagg has been determined in the temperature range of 20-30°C. Rh and Nagg remained approximately constant in the whole temperature range for A2B2, A3B3, and (AB)3. A substantial increase in both Rh and Nagg occurred at 25°C for AB-1. The particle size distribution for all block copolymers remained narrow in the whole temperature range. Below 25°C, Rh increased in the order (AB)3 <AB-1 <A2B2 <A 3B3 and Nagg increased in the (AB)3 <A3B3 <A2B2 <AB order. The numbers of AB units in the micelles, however, were similar. Micelles of A2B2 and A3B3 consisted of 5600 and 5700 AB units respectively, while these numbers were slightly lower for AB-1 (4500) and (AB)3 (4800).",
keywords = "Aggregation number, Amphiphilic block copolymer, Critical micelle concentration, Hydrodynamic radius, Micelle, Polymer architecture",
author = "Jongpil Yun and Rudolf Faust and Szil{\'a}gyi, {L{\'a}szl{\'o} Sz} and S. K{\'e}ki and M. Zsuga",
year = "2004",
month = "6",
doi = "10.1081/MA-120034194",
language = "English",
volume = "41 A",
pages = "613--627",
journal = "Journal of Macromolecular Science - Pure and Applied Chemistry",
issn = "1060-1325",
publisher = "Taylor and Francis Ltd.",
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TY - JOUR

T1 - Effect of architecture on the micellar properties of amphiphilic block copolymers

T2 - Comparison of AB linear diblock, A2B2, A 3B3, and (AB)3 star block copolymers

AU - Yun, Jongpil

AU - Faust, Rudolf

AU - Szilágyi, László Sz

AU - Kéki, S.

AU - Zsuga, M.

PY - 2004/6

Y1 - 2004/6

N2 - The influence of architecture on aqueous micellar properties of amphiphilic block copolymers AB-1, A2B2, A3B3, and (AB)3 (A = polyisobutylene (PIB), B = poly(methyl vinyl ether) (PMeVE)), with approximately constant A and B segment lengths, was investigated. A comparison of AB-1 with AB-2 and AB-3 diblock copolymers having similar composition but higher total molecular weight suggested spherical core-shell morphology for AB-3 and vesicles for AB-1 and AB-2. Similarly to AB-1, star block copolymers A2B2, A3B3, and (AB)3 also formed vesicles with unusually high aggregation number (Nagg) and hydrodynamic radius (Rh). The critical micelle concentration (CMC) measured by fluorescence spectroscopy at 20°C increased in the order (AB)3 = AB-1 <A2B2 ∼ A3B3. The temperature dependence of Rh and Nagg has been determined in the temperature range of 20-30°C. Rh and Nagg remained approximately constant in the whole temperature range for A2B2, A3B3, and (AB)3. A substantial increase in both Rh and Nagg occurred at 25°C for AB-1. The particle size distribution for all block copolymers remained narrow in the whole temperature range. Below 25°C, Rh increased in the order (AB)3 <AB-1 <A2B2 <A 3B3 and Nagg increased in the (AB)3 <A3B3 <A2B2 <AB order. The numbers of AB units in the micelles, however, were similar. Micelles of A2B2 and A3B3 consisted of 5600 and 5700 AB units respectively, while these numbers were slightly lower for AB-1 (4500) and (AB)3 (4800).

AB - The influence of architecture on aqueous micellar properties of amphiphilic block copolymers AB-1, A2B2, A3B3, and (AB)3 (A = polyisobutylene (PIB), B = poly(methyl vinyl ether) (PMeVE)), with approximately constant A and B segment lengths, was investigated. A comparison of AB-1 with AB-2 and AB-3 diblock copolymers having similar composition but higher total molecular weight suggested spherical core-shell morphology for AB-3 and vesicles for AB-1 and AB-2. Similarly to AB-1, star block copolymers A2B2, A3B3, and (AB)3 also formed vesicles with unusually high aggregation number (Nagg) and hydrodynamic radius (Rh). The critical micelle concentration (CMC) measured by fluorescence spectroscopy at 20°C increased in the order (AB)3 = AB-1 <A2B2 ∼ A3B3. The temperature dependence of Rh and Nagg has been determined in the temperature range of 20-30°C. Rh and Nagg remained approximately constant in the whole temperature range for A2B2, A3B3, and (AB)3. A substantial increase in both Rh and Nagg occurred at 25°C for AB-1. The particle size distribution for all block copolymers remained narrow in the whole temperature range. Below 25°C, Rh increased in the order (AB)3 <AB-1 <A2B2 <A 3B3 and Nagg increased in the (AB)3 <A3B3 <A2B2 <AB order. The numbers of AB units in the micelles, however, were similar. Micelles of A2B2 and A3B3 consisted of 5600 and 5700 AB units respectively, while these numbers were slightly lower for AB-1 (4500) and (AB)3 (4800).

KW - Aggregation number

KW - Amphiphilic block copolymer

KW - Critical micelle concentration

KW - Hydrodynamic radius

KW - Micelle

KW - Polymer architecture

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U2 - 10.1081/MA-120034194

DO - 10.1081/MA-120034194

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VL - 41 A

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EP - 627

JO - Journal of Macromolecular Science - Pure and Applied Chemistry

JF - Journal of Macromolecular Science - Pure and Applied Chemistry

SN - 1060-1325

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