1
|
Cho J, Oh J, Bang J, Koh JH, Jeong HY, Chung S, Son JG. Roll-to-plate 0.1-second shear-rolling process at elevated temperature for highly aligned nanopatterns. Nat Commun 2023; 14:8412. [PMID: 38110407 PMCID: PMC10728125 DOI: 10.1038/s41467-023-43766-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Accepted: 11/18/2023] [Indexed: 12/20/2023] Open
Abstract
The shear-rolling process is a promising directed self-assembly method that can produce high-quality sub-10 nm block copolymer line-space patterns cost-effectively and straightforwardly over a large area. This study presents a high temperature (280 °C) and rapid (~0.1 s) shear-rolling process that can achieve a high degree of orientation in a single process while effectively preventing film delamination, that can be applied to large-area continuous processes. By minimizing adhesion, normal forces, and ultimate shear strain of the polydimethylsiloxane pad, shearing was successfully performed without peeling up to 280 °C at which the chain mobility significantly increases. This method can be utilized for various high-χ block copolymers and surface neutralization processes. It enables the creation of block copolymer patterns with a half-pitch as small as 8 nm in a unidirectional way. Moreover, the 0.1-second rapid shear-rolling was successfully performed on long, 3-inch width polyimide flexible films to validate its potential for the roll-to-roll process.
Collapse
Affiliation(s)
- Junghyun Cho
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology (KIST), Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Jinwoo Oh
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology (KIST), Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Joona Bang
- Department of Chemical and Biological Engineering, Korea University, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Jai Hyun Koh
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Hoon Yeub Jeong
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology (KIST), Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Seungjun Chung
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology (KIST), Seongbuk-gu, Seoul, 02792, Republic of Korea
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Jeong Gon Son
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology (KIST), Seongbuk-gu, Seoul, 02792, Republic of Korea.
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seongbuk-gu, Seoul, 02841, Republic of Korea.
| |
Collapse
|
2
|
Singh M, Dong M, Wu W, Nejat R, Tran DK, Pradhan N, Raghavan D, Douglas JF, Wooley KL, Karim A. Enhanced Dielectric Strength and Capacitive Energy Density of Cyclic Polystyrene Films. ACS POLYMERS AU 2022; 2:324-332. [PMID: 36254316 PMCID: PMC9562468 DOI: 10.1021/acspolymersau.2c00014] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
The maximum capacitive
energy stored in polymeric dielectric capacitors,
which are ubiquitous in high-power-density devices, is dictated by
the dielectric breakdown strength of the dielectric polymer. The fundamental
mechanisms of the dielectric breakdown, however, remain unclear. Based
on a simple free-volume model of the polymer fluid state, we hypothesized
that the free ends of linear polymer chains might act as “defect”
sites, at which the dielectric breakdown can initiate. Thus, the dielectric
breakdown strength of cyclic polymers should exhibit enhanced stability
in comparison to that of their linear counterparts having the same
composition and similar molar mass. This hypothesis is supported by
the ∼50% enhancement in the dielectric breakdown strength and
∼80% enhancement in capacitive energy density of cyclic polystyrene
melt films in comparison to corresponding linear polystyrene control
films. Furthermore, we observed that cyclic polymers exhibit a denser
packing density than the linear chain melts, an effect that is consistent
with and could account for the observed property changes. Our work
demonstrates that polymer topology can significantly influence the
capacitive properties of polymer films, and correspondingly, we can
expect polymer topology to influence the gas permeability, shear modulus,
and other properties of thin films dependent on film density.
Collapse
Affiliation(s)
- Maninderjeet Singh
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Mei Dong
- Departments of Chemistry, Chemical Engineering, and Materials Science & Engineering, Texas A&M University, College Station, Texas 77842, United States
| | - Wenjie Wu
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Roushanak Nejat
- Materials Engineering Program, University of Houston, Houston, Texas 77204, United States
| | - David K. Tran
- Departments of Chemistry, Chemical Engineering, and Materials Science & Engineering, Texas A&M University, College Station, Texas 77842, United States
| | - Nihar Pradhan
- Department of Chemistry, Physics and Atmospheric Science, Jackson State University, Jackson, Mississippi 39217, United States
| | - Dharmaraj Raghavan
- Department of Chemistry, Howard University, Washington, DC 20059, United States
| | - Jack F. Douglas
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Karen L. Wooley
- Departments of Chemistry, Chemical Engineering, and Materials Science & Engineering, Texas A&M University, College Station, Texas 77842, United States
| | - Alamgir Karim
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| |
Collapse
|
3
|
Wu W, Singh M, Zhai Y, Masud A, Tonny W, Yuan C, Yin R, Al-Enizi AM, Bockstaller MR, Matyjaszewski K, Douglas JF, Karim A. Facile Entropy-Driven Segregation of Imprinted Polymer-Grafted Nanoparticle Brush Blends by Solvent Vapor Annealing Soft Lithography. ACS APPLIED MATERIALS & INTERFACES 2022; 14:45765-45774. [PMID: 36174114 DOI: 10.1021/acsami.2c11134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Polymer-grafted nanoparticles (PGNPs) have attracted extensive research interest due to their potential for enhancing mechanical and electrical properties of both bulk polymer composite materials, as well as thin polymer films incorporating these nanoparticles (NPs). In previous studies, we have shown that an entropic driving force serves to organize low-molecular-mass PGNPs in imprinted blend films of PGNPs with low-molecular-mass homopolymers. In this work, we developed a novel solvent vapor annealing soft lithography (SVA-SL) method to overcome the technical difficulties in processing the high-molecular-mass PGNP blends due to the intrinsically sluggish melt annealing kinetics found in the phase separation of these blend PGNP materials. In particular, we utilized SVA-SL to create nanopatterns in blends of PGNPs having relatively high-molecular-mass-grafted layers but with cores of NPs having greatly different sizes. The minimization of the entropic free energy in the present system corresponded to larger PGNPs partitioning almost exclusively into the "mesa" regions of the imprinted PGNP blend films, as quantified by the estimation of the partition coefficient, Kp. The use of the SVA-SL processing method is important because it allows facile imprint patterning of PGNP materials and large-scale organization of the PGNPs even when the grafted chain lengths are long enough for the chains to be highly entangled, allowing enhanced thermo-mechanical property enhancements of the resulting films and a corresponding extended range of potential nanotech applications.
Collapse
Affiliation(s)
- Wenjie Wu
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas77204, United States
| | - Maninderjeet Singh
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas77204, United States
| | - Yue Zhai
- Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania15213, United States
| | - Ali Masud
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas77204, United States
| | - Wafa Tonny
- Department of Materials Science and Engineering, University of Houston, Houston, Texas77204, United States
| | - Chuqing Yuan
- Department of Materials Science and Engineering, University of Houston, Houston, Texas77204, United States
| | - Rongguan Yin
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania15213, United States
| | - Abdullah M Al-Enizi
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh11451, Saudi Arabia
| | - Michael R Bockstaller
- Department of Materials Science and Engineering, University of Houston, Houston, Texas77204, United States
| | - Krzysztof Matyjaszewski
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania15213, United States
| | - Jack F Douglas
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland20899, United States
| | - Alamgir Karim
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas77204, United States
| |
Collapse
|