Thickness-Dependent Ordering Kinetics in Cylindrical Block Copolymer/Homopolymer Ternary Blends
Abstract
The slow kinetics of block copolymer self-assembly may hinder, or even prevent, the realization of expected equilibrium ordered morphologies. Here in this paper we investigate the self-assembly kinetics of cylinder-forming polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) and its corresponding ternary blends with low molecular weight PS and PMMA in thin films ranging from <1 to several cylinder layers in thickness. In situ grazing-incidence X-ray scattering coupled with ex situ electron microscopy reveals pathway-dependent ordering substantially altered by homopolymer blending. In particular, the neat (unblended) block copolymer (BCP) is kinetically frustrated in films more than ~1 cylinder layer thick and is unable to reach a state of ordered hexagonally packed cylinders during the annealing interval. On the other hand, while blends exhibit similar pattern coarsening behavior to neat BCPs for hexagonally ordered cylinders, reorientation transitions between vertical or horizontal cylinders are dramatically accelerated in blend thin films. We infer that more rapid early stage ordering observed in blends can be attributed in part to faster reorientation transitions.
- Authors:
-
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- City College of City Univ. of New York, NY (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1767427
- Alternate Identifier(s):
- OSTI ID: 1485805
- Report Number(s):
- BNL-221092-2021-JAAM; BNL-209683-2018-JAAM
Journal ID: ISSN 0024-9297
- Grant/Contract Number:
- SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Macromolecules
- Additional Journal Information:
- Journal Volume: 51; Journal Issue: 24; Journal ID: ISSN 0024-9297
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; Thickness; thin films; grazing incidence small angle scattering; homopolymers; annealing (metallurgy)
Citation Formats
Doerk, Gregory S., Li, Ruipeng, Fukuto, Masafumi, Rodriguez, Alfredo, and Yager, Kevin G. Thickness-Dependent Ordering Kinetics in Cylindrical Block Copolymer/Homopolymer Ternary Blends. United States: N. p., 2018.
Web. doi:10.1021/acs.macromol.8b01773.
Doerk, Gregory S., Li, Ruipeng, Fukuto, Masafumi, Rodriguez, Alfredo, & Yager, Kevin G. Thickness-Dependent Ordering Kinetics in Cylindrical Block Copolymer/Homopolymer Ternary Blends. United States. https://doi.org/10.1021/acs.macromol.8b01773
Doerk, Gregory S., Li, Ruipeng, Fukuto, Masafumi, Rodriguez, Alfredo, and Yager, Kevin G. Wed .
"Thickness-Dependent Ordering Kinetics in Cylindrical Block Copolymer/Homopolymer Ternary Blends". United States. https://doi.org/10.1021/acs.macromol.8b01773. https://www.osti.gov/servlets/purl/1767427.
@article{osti_1767427,
title = {Thickness-Dependent Ordering Kinetics in Cylindrical Block Copolymer/Homopolymer Ternary Blends},
author = {Doerk, Gregory S. and Li, Ruipeng and Fukuto, Masafumi and Rodriguez, Alfredo and Yager, Kevin G.},
abstractNote = {The slow kinetics of block copolymer self-assembly may hinder, or even prevent, the realization of expected equilibrium ordered morphologies. Here in this paper we investigate the self-assembly kinetics of cylinder-forming polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) and its corresponding ternary blends with low molecular weight PS and PMMA in thin films ranging from <1 to several cylinder layers in thickness. In situ grazing-incidence X-ray scattering coupled with ex situ electron microscopy reveals pathway-dependent ordering substantially altered by homopolymer blending. In particular, the neat (unblended) block copolymer (BCP) is kinetically frustrated in films more than ~1 cylinder layer thick and is unable to reach a state of ordered hexagonally packed cylinders during the annealing interval. On the other hand, while blends exhibit similar pattern coarsening behavior to neat BCPs for hexagonally ordered cylinders, reorientation transitions between vertical or horizontal cylinders are dramatically accelerated in blend thin films. We infer that more rapid early stage ordering observed in blends can be attributed in part to faster reorientation transitions.},
doi = {10.1021/acs.macromol.8b01773},
journal = {Macromolecules},
number = 24,
volume = 51,
place = {United States},
year = {Wed Dec 12 00:00:00 EST 2018},
month = {Wed Dec 12 00:00:00 EST 2018}
}
Web of Science
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