skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Block Co-PolyMOCs by Stepwise Self-Assembly

; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
OSTI Identifier:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the American Chemical Society; Journal Volume: 138; Journal Issue: 33
Country of Publication:
United States

Citation Formats

Wang, Yufeng, Zhong, Mingjiang, Park, Jiwon V., Zhukhovitskiy, Aleksandr V., Shi, Weichao, and Johnson, Jeremiah A. Block Co-PolyMOCs by Stepwise Self-Assembly. United States: N. p., 2016. Web. doi:10.1021/jacs.6b06712.
Wang, Yufeng, Zhong, Mingjiang, Park, Jiwon V., Zhukhovitskiy, Aleksandr V., Shi, Weichao, & Johnson, Jeremiah A. Block Co-PolyMOCs by Stepwise Self-Assembly. United States. doi:10.1021/jacs.6b06712.
Wang, Yufeng, Zhong, Mingjiang, Park, Jiwon V., Zhukhovitskiy, Aleksandr V., Shi, Weichao, and Johnson, Jeremiah A. 2016. "Block Co-PolyMOCs by Stepwise Self-Assembly". United States. doi:10.1021/jacs.6b06712.
title = {Block Co-PolyMOCs by Stepwise Self-Assembly},
author = {Wang, Yufeng and Zhong, Mingjiang and Park, Jiwon V. and Zhukhovitskiy, Aleksandr V. and Shi, Weichao and Johnson, Jeremiah A.},
abstractNote = {},
doi = {10.1021/jacs.6b06712},
journal = {Journal of the American Chemical Society},
number = 33,
volume = 138,
place = {United States},
year = 2016,
month = 8
  • Block copolymers made by covalently linking two or more conjugated polymers have significant potential for organic optoelectronic applications, particularly those requiring a p/n junction. Herein, we report the structure of all-conjugated diblock copolymers poly(3-hexylthiophene)-block-poly(9,9-dioctylfluorene) and poly(3-hexylthiophene)-block-poly(9,9-dioctylfluorene-co-benzothiadiazole) in thin films and in the bulk. The diblock copolymers are prepared using a combination of Grignard metathesis polymerization and Suzuki polycondensation and purified using solvent extraction and column chromatography. 1H NMR, SEC, and UV/Visible absorbance measurements are used to characterize the materials and quantify the amount of homopolymer impurities. Thin films and bulk structure are characterized using a combination of differential scanning calorimetry,more » x-ray diffraction, small-angle x-ray scattering, and atomic force microscopy. Atomic force microscopy images reveal nanoscale lamellar domains in solvent-annealed diblock copolymer thin films, and peaks in x-ray diffraction data correspond to poly(3-hexylthiophene) crystallites. On cooling from temperatures above the crystallization temperature to below the crystallization temperature, two peaks appear in temperature-dependent small-angle x-ray scattering traces - one associated with poly(3-hexylthiophene) crystallites and a second low-angle peak indicative of a self-assembled nanostructured. These measurements show all-conjugated diblock copolymers self-assemble into nanoscale crystalline domains present throughout the bulk samples which may be useful for improving the performance of organic photovoltaics and organic light-emitting diodes.« less
  • An inorganic–organic hybrid surfactant with a hexavanadate cluster as the polar head group was designed and observed to assemble into micelle structures, which further spontaneously coagulate into a 1D anisotropic structure in aqueous solutions. Such a hierarchical self-assembly process is driven by the cooperation of varied noncovalent interactions, including hydrophobic, electrostatic, and hydrogen-bonding interactions. The hydrophobic interaction drives the quick formation of the micelle structure; electrostatic interactions involving counterions leads to the further coagulation of the micelles into larger assemblies. This process is similar to the crystallization process, but the specific counterions and the directional hydrogen bonding lead to themore » 1D growth of the final assemblies. Since most of the hexavanadates are exposed to the surface, the 1D assembly with nanoscale thickness is a highly efficient heterogeneous catalyst for the oxidation of organic sulfides with appreciable recyclability.« less
  • One of the most challenging problems in materials synthesis is the design of solid polymers with pre-defined secondary and tertiary structures. A large body of current research has addressed this problem, primarily through two approaches: the self-assembly of low molar mass molecules that have strong intermolecular interactions, and the manipulation of the phase structures formed by segregated block copolymers. Preparing block copolymers where one or both of the blocks are crystallizable can extend the range of structures and morphologies that can be obtained from block copolymers. In recent work, the authors borrowed from small molecule chemistry as well as themore » tendency for block copolymers to phase-separate to build materials with defined conformations. For building blocks, the authors incorporate exact length segments of polyethylene (PE) and poly(ethylene oxide) (PEO) into polymers in a regular (AB){sub n} pattern. The PEO and PE segments strongly phase-separate, and unlike most block copolymers, both segments crystallize to form a rich variety of crystalline phases.« less