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Title: Iterative Exponential Growth Synthesis and Assembly of Uniform Diblock Copolymers

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
INDUSTRY
OSTI Identifier:
1346238
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the American Chemical Society; Journal Volume: 138; Journal Issue: 30
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Jiang, Yivan, Golder, Matthew R., Nguyen, Hung V. -T., Wang, Yufeng, Zhong, Mingjiang, Barnes, Jonathan C., Ehrlich, Deborah J. C., and Johnson, Jeremiah A. Iterative Exponential Growth Synthesis and Assembly of Uniform Diblock Copolymers. United States: N. p., 2016. Web. doi:10.1021/jacs.6b04964.
Jiang, Yivan, Golder, Matthew R., Nguyen, Hung V. -T., Wang, Yufeng, Zhong, Mingjiang, Barnes, Jonathan C., Ehrlich, Deborah J. C., & Johnson, Jeremiah A. Iterative Exponential Growth Synthesis and Assembly of Uniform Diblock Copolymers. United States. doi:10.1021/jacs.6b04964.
Jiang, Yivan, Golder, Matthew R., Nguyen, Hung V. -T., Wang, Yufeng, Zhong, Mingjiang, Barnes, Jonathan C., Ehrlich, Deborah J. C., and Johnson, Jeremiah A. Wed . "Iterative Exponential Growth Synthesis and Assembly of Uniform Diblock Copolymers". United States. doi:10.1021/jacs.6b04964.
@article{osti_1346238,
title = {Iterative Exponential Growth Synthesis and Assembly of Uniform Diblock Copolymers},
author = {Jiang, Yivan and Golder, Matthew R. and Nguyen, Hung V. -T. and Wang, Yufeng and Zhong, Mingjiang and Barnes, Jonathan C. and Ehrlich, Deborah J. C. and Johnson, Jeremiah A.},
abstractNote = {},
doi = {10.1021/jacs.6b04964},
journal = {Journal of the American Chemical Society},
number = 30,
volume = 138,
place = {United States},
year = {Wed Aug 03 00:00:00 EDT 2016},
month = {Wed Aug 03 00:00:00 EDT 2016}
}
  • No abstract prepared.
  • This paper describes the synthesis and characterization of a novel series of copolymers with different lengths of oligo(phenylene vinylene) (OPV) as the rod block, and poly(propylene oxide) as the coil block. Detailed characterization by means of transmission electron microscopy (TEM), atomic force microscopy (AFM), and small-angle neutron scattering (SANS) revealed the strong tendency of these copolymers to self-assemble into cylindrical micelles in solution and as-casted films on a nanometer scale. These micelles have a cylindrical OPV core surrounded by a poly(propylene glycol) (PPG) corona and readily align with each other to form parallel packed structures when mica is used asmore » the substrate. A packing model has been proposed for these cylindrical micelles.« less
  • We have investigated the self-assembly properties in aqueous solution of amphiphilic diblock copolymers with insoluble blocks of different hydrophobicity and demonstrated that the condition to obtain dynamic micelles is to design samples with insoluble blocks of low enough hydrophobicity. We focus here on results with new water-soluble amphiphilic diblock copolymers poly(diethyleneglycol ethylether acrylate)-b-poly(acrylic acid), or PDEGA-b-PAA. The physical characteristics of PDEGA-b-PAA micelles at high ionization have been determined by small angle neutron scattering (SANS). We show that PDEGA-b-PAA samples form micelles at thermodynamic equilibrium. The critical micelle concentrations (CMCs) decrease strongly with ionic strength and temperature due to a solventmore » quality decrease for, respectively, the corona and the core. This behavior of reversible aggregation is remarkable as compared to the behavior of kinetically frozen aggregation that has been widely observed with samples of similar architecture and different hydrophobic blocks, for example, poly(styrene)-b-poly(acrylic acid), PS-b-PAA, and poly(butyl acrylate)-b-poly(acrylic acid), PBA-b-PAA. We have measured the interfacial tension between water and the homopolymers PDEGA and PBA at, respectively, 3 and 20 mN/m at room temperature, which permits one to estimate the energy cost to extract a unimer from a micelle. The results are consistent with a micelle association that is fast for PDEGA-b-PAA and kinetically frozen PBA-b-PAA. Hence, PDEGA-b-PAA samples form a new system of synthetic charged macrosurfactant with unique properties of fast dynamic association, tunable charge, and water solubility even at temperatures and NaCl concentrations as high as 65 C and 1 M.« less