Synthesis and self-assembly of amphiphilic macrocyclic block copolymer topologies

Lonsdale, Daria E. and Monteiro, Michael J. (2011) Synthesis and self-assembly of amphiphilic macrocyclic block copolymer topologies. Journal of Polymer Science Part A: Polymer Chemistry, 49 21: 4603-4612. doi:10.1002/pola.24935

Author Lonsdale, Daria E.
Monteiro, Michael J.
Title Synthesis and self-assembly of amphiphilic macrocyclic block copolymer topologies
Journal name Journal of Polymer Science Part A: Polymer Chemistry   Check publisher's open access policy
ISSN 0887-624X
Publication date 2011-11-01
Year available 2011
Sub-type Article (original research)
DOI 10.1002/pola.24935
Volume 49
Issue 21
Start page 4603
End page 4612
Total pages 10
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Collection year 2012
Language eng
Formatted abstract
We demonstrated the synthesis of miktoarm star
block copolymers of AB, AB2, and A2B, in which block A consisted
of linear poly(tert-butyl acrylate) (PtBA) and block B consisted
of cyclic polystyrene. These structures were produced
using the atom transfer radical polymerization to make telechelic
polymers that, after modification, were further coupled together
by copper-catalyzed ‘‘click’’ reactions with high coupling efficiency.
Deprotection of PtBA to poly(acrylic acid) (PAA) afforded
amphiphilic miktoarm structures that when micellized in water
gave vesicle morphologies when the block length of PAA was 21
units. Increasing the PAA block length to 46 units produced
spherical core-shell micelles. AB2 miktoarm stars packed more
densely into the core compared to its linear counterpart (i.e., a
four times greater aggregation number with approximately the
same hydrodynamic diameter), resulting in the PAA arms being
more compressed in the corona and extending into the water
phase beyond its normal Gaussian chain conformation. These
results show that the cyclic structure attached to an amphiphilic
block has a significant influence on increasing the aggregation
number through a greater packing density.
Keyword Block copolymers
Cyclic polymers
Living radical polymerization (LRP)
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
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