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Degaki H, Taniguchi I, Deguchi S, Koga T. Critical role of lattice vacancies in pressure-induced phase transitions of baroplastic diblock copolymers. SOFT MATTER 2024; 20:3728-3731. [PMID: 38516820 DOI: 10.1039/d4sm00098f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/23/2024]
Abstract
Baroplastic diblock copolymers exhibit order-disorder transitions and melt upon compression at low temperatures, in some cases even at ambient temperatures. Their unique low-temperature processability makes them promising candidates for sustainable polymeric materials. Despite their potential, however, the molecular mechanisms governing the pressure-induced phase transitions of these copolymers remain largely unexplored. This study develops a compressible self-consistent field theory for baroplastic copolymers based on a simple lattice vacancy model that explicitly incorporates voids to account for compressibility. The theory shows that the selective presence of voids in compressible domains stabilizes the ordered phase, while a reduction of voids under compression leads to the order-disorder transition. In addition, this work demonstrates for the first time the critical role of gas absorption rates in each segment in the pressure-induced order-disorder transition of baroplastic diblock copolymers. These findings have significant implications for the rational design of baroplastic polymers with tailored low-temperature processability.
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Affiliation(s)
- Hiroki Degaki
- Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
- Research Center for Bioscience and Nanoscience, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
| | - Ikuo Taniguchi
- Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
- Research Center for Bioscience and Nanoscience, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
| | - Shigeru Deguchi
- Research Center for Bioscience and Nanoscience, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
| | - Tsuyoshi Koga
- Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
- Research Center for Bioscience and Nanoscience, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
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2
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Zhang X, Zhao M, Cho J. Effect of Disparity in Self Dispersion Interactions on Phase Behaviors of Molten A-b-B Diblock Copolymers. Polymers (Basel) 2022; 15:polym15010030. [PMID: 36616381 PMCID: PMC9824038 DOI: 10.3390/polym15010030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 12/07/2022] [Accepted: 12/09/2022] [Indexed: 12/24/2022] Open
Abstract
Phase behaviors of molten A-b-B diblock copolymers with disparity in self dispersion interactions are revisited here. A free energy functional is obtained for the corresponding Gaussian copolymers under the influence of effective interactions originating in the localized excess equation of state. The Landau free energy expansion is then formulated as a series in powers of A and B density fluctuations up to 4th order. An alternative and equivalent Landau energy is also provided through the transformation of the order parameters to the fluctuations in block density difference and free volume fraction. The effective Flory χ is elicited from its quadratic term as the sum of the conventional enthalpic χH and the entropic χS that is related to energetic asymmetry mediated by copolymer bulk modulus. It is shown that the cubic term is balanced with Gaussian cubic vertex coefficients in corporation with energetics to yield a critical point at a composition rich in a component with stronger self interactions. The full phase diagrams with classical mesophases are given for the copolymers exhibiting ordering upon cooling and also for others revealing ordering reversely upon heating. These contrasting temperature responses, along with the skewness of phase boundaries, are discussed in relation to χH and χS. The pressure dependence of their ordering transitions is either barotropic or baroplastic; or anomalously exhibits anomalously both at different stages. These actions are all explained by the opposite responses of χH and χS to pressure.
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Affiliation(s)
| | | | - Junhan Cho
- Correspondence: ; Tel.: +82-31-8005-3586
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3
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Polyacrylonitrile- b-Polystyrene Block Copolymer-Derived Hierarchical Porous Carbon Materials for Supercapacitor. Polymers (Basel) 2022; 14:polym14235109. [PMID: 36501504 PMCID: PMC9739205 DOI: 10.3390/polym14235109] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 11/16/2022] [Accepted: 11/19/2022] [Indexed: 11/27/2022] Open
Abstract
The use of block copolymers as a sacrificial template has been demonstrated to be a powerful method for obtaining porous carbons as electrode materials in energy storage devices. In this work, a block copolymer of polystyrene and polyacrylonitrile (PS-b-PAN) has been used as a precursor to produce fibers by electrospinning and powdered carbons, showing high carbon yield (~50%) due to a low sacrificial block content (fPS ≈ 0.16). Both materials have been compared structurally (in addition to comparing their electrochemical behavior). The porous carbon fibers showed superior pore formation capability and exhibited a hierarchical porous structure, with small and large mesopores and a relatively high surface area (~492 m2/g) with a considerable quantity of O/N surface content, which translates into outstanding electrochemical performance with excellent cycle stability (close to 100% capacitance retention after 10,000 cycles) and high capacitance value (254 F/g measured at 1 A/g).
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Zhao M, Zhang X, Cho J. Phase Behaviors of a Binary Blend of Oppositely Charged Polyelectrolytes: A Weak Segregation Approach. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mingge Zhao
- Department of Polymer Science & Engineering, Dankook University, 152 Jukjeon-ro, Suji-gu, Yongin, Gyeonggi-do 16890, Korea
| | - Xinyue Zhang
- Department of Polymer Science & Engineering, Dankook University, 152 Jukjeon-ro, Suji-gu, Yongin, Gyeonggi-do 16890, Korea
| | - Junhan Cho
- Department of Polymer Science & Engineering, Dankook University, 152 Jukjeon-ro, Suji-gu, Yongin, Gyeonggi-do 16890, Korea
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María N, Maiz J, Martínez-Tong DE, Alegria A, Algarni F, Zapzas G, Hadjichristidis N, Müller AJ. Phase Transitions in Poly(vinylidene fluoride)/Polymethylene-Based Diblock Copolymers and Blends. Polymers (Basel) 2021; 13:2442. [PMID: 34372044 PMCID: PMC8348057 DOI: 10.3390/polym13152442] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 07/22/2021] [Accepted: 07/22/2021] [Indexed: 11/16/2022] Open
Abstract
The crystallization and morphology of two linear diblock copolymers based on polymethylene (PM) and poly(vinylidene fluoride) (PVDF) with compositions PM23-b-PVDF77 and PM38-b-PVDF62 (where the subscripts indicate the relative compositions in wt%) were compared with blends of neat components with identical compositions. The samples were studied by SAXS (Small Angle X-ray Scattering), WAXS (Wide Angle X-ray Scattering), PLOM (Polarized Light Optical Microscopy), TEM (Transmission Electron Microscopy), DSC (Differential Scanning Calorimetry), BDS (broadband dielectric spectroscopy), and FTIR (Fourier Transform Infrared Spectroscopy). The results showed that the blends are immiscible, while the diblock copolymers are miscible in the melt state (or very weakly segregated). The PVDF component crystallization was studied in detail. It was found that the polymorphic structure of PVDF was a strong function of its environment. The number of polymorphs and their amount depended on whether it was on its own as a homopolymer, as a block component in the diblock copolymers or as an immiscible phase in the blends. The cooling rate in non-isothermal crystallization or the crystallization temperature in isothermal tests also induced different polymorphic compositions in the PVDF crystals. As a result, we were able to produce samples with exclusive ferroelectric phases at specific preparation conditions, while others with mixtures of paraelectric and ferroelectric phases.
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Affiliation(s)
- Nicolás María
- POLYMAT, University of the Basque Country UPV/EHU, Avenida de Tolosa 72, 20018 Donostia-San Sebastián, Spain;
| | - Jon Maiz
- POLYMAT, University of the Basque Country UPV/EHU, Avenida de Tolosa 72, 20018 Donostia-San Sebastián, Spain;
- Centro de Física de Materiales (CFM) (CSIC-UPV/EHU)-Matrials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastián, Spain; (D.E.M.-T.); (A.A.)
- IKERBASQUE—Basque Foundation for Science, Plaza Euskadi 5, 48009 Bilbao, Spain
| | - Daniel E. Martínez-Tong
- Centro de Física de Materiales (CFM) (CSIC-UPV/EHU)-Matrials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastián, Spain; (D.E.M.-T.); (A.A.)
- Department of Polymers and Advanced Materials: Physics, Chemistry and Technology, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain
| | - Angel Alegria
- Centro de Física de Materiales (CFM) (CSIC-UPV/EHU)-Matrials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastián, Spain; (D.E.M.-T.); (A.A.)
- Department of Polymers and Advanced Materials: Physics, Chemistry and Technology, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain
| | - Fatimah Algarni
- KAUST Catalysis Center, Polymer Synthesis Laboratory, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia; (F.A.); (G.Z.)
| | - George Zapzas
- KAUST Catalysis Center, Polymer Synthesis Laboratory, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia; (F.A.); (G.Z.)
| | - Nikos Hadjichristidis
- KAUST Catalysis Center, Polymer Synthesis Laboratory, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia; (F.A.); (G.Z.)
| | - Alejandro J. Müller
- POLYMAT, University of the Basque Country UPV/EHU, Avenida de Tolosa 72, 20018 Donostia-San Sebastián, Spain;
- IKERBASQUE—Basque Foundation for Science, Plaza Euskadi 5, 48009 Bilbao, Spain
- Department of Polymers and Advanced Materials: Physics, Chemistry and Technology, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizabal 3, 20018 Donostia-San Sebastián, Spain
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Zhao M, Li X, Cho J. Pressure Effects on Self-Assembly in Mixtures Containing Zwitterionic Amphiphiles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:3882-3896. [PMID: 33754727 DOI: 10.1021/acs.langmuir.1c00024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
To understand the responses of self-assembly in mixtures containing zwitterionic amphiphilic chains to high pressure, we introduce a self-consistent field theory in combination with a molecular equation-of-state model for them in a primitive way. The free energy density for those in the bulk state is first formulated. Its locally equilibrated excess part is then incorporated into Edwards Hamiltonian along with the electrostatic energy contributions to elicit the saddle point approximation to the partition function with proper self-consistent field equations. It is shown that charge-charge correlations enhance self-assembling tendency for the amphiphiles with the opposite charges on one component side, as the medium dielectric constant εr decreases. Those with the opposite charges at the two chain ends respond in a more complicated way to εr. Densification by applied pressure strengthens the self-assembly for both at a moderate εr, similar to typical phospholipids, but pressure effects are strongly dependent on the position of charges along the chains at a lower εr. It is argued that the manipulation of the dielectric environment and disparity in component dispersion interactions can yield useful materials exhibiting various types of baroresponsivity or thermoresponsivity with re-entrant self-assembly.
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Affiliation(s)
- Mingge Zhao
- Department of Polymer Science & Engineering, Dankook University, 152 Jukjeon-ro, Suji-gu, Yongin, Gyeonggi-do 16890, Korea
| | - Xiang Li
- Department of Polymer Science & Engineering, Dankook University, 152 Jukjeon-ro, Suji-gu, Yongin, Gyeonggi-do 16890, Korea
| | - Junhan Cho
- Department of Polymer Science & Engineering, Dankook University, 152 Jukjeon-ro, Suji-gu, Yongin, Gyeonggi-do 16890, Korea
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Abstract
We study phase behaviors in compressible polymer blends by using an equation of state in the framework of classical density-functional theory. The phase behaviors are explored by decomposing the compressible mixing of polymers into two steps: incompressible mixing as holding the volume and density relaxation at the given pressure. There exists both upper consolute pressure (UCP) and lower consolute pressure (LCP). LCP-type behaviors are driven by the entropy effect of asymmetric size of molecules, while UCP-type behaviors are driven by energetic interactions. The value of LCP follows a scaling of O(N-2), which can be improved to O(N-1.8) by taking into account the effects of random chain conformation. The volume of LCP-type polymers expands upon mixing, while that of UCP-type polymers contracts. A closed-loop phase coexisting curve may appear because of the interplay between UCP- and LCP-type behaviors. At the UCP/LCP boundary, the mixing free energy of density relaxation is much smaller than that of both UCP- and LCP-type behaviors. The contribution from incompressible mixing step always dominates the phase behaviors, while that from density relaxation step could distinguish UCP-type between LCP-type behaviors.
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Affiliation(s)
- Xiaofei Xu
- State Key Laboratory of Chemical Engineering and School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
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8
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Cho J. Identification of Some New Triply Periodic Mesophases from Molten Block Copolymers. Polymers (Basel) 2019; 11:E1081. [PMID: 31242598 PMCID: PMC6631806 DOI: 10.3390/polym11061081] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 06/19/2019] [Accepted: 06/22/2019] [Indexed: 11/16/2022] Open
Abstract
Using field-theoretic simulations based on a self-consistent field theory (SCFT) with or without finite compressibility, nanoscale mesophase formation in molten linear AB and ABC block copolymers is investigated in search of candidates for new and useful nanomaterials. At selected compositions and segregation strengths, the copolymers are shown to evolve into some new nanostructures with either unusual crystal symmetry or a peculiar morphology. There exists a holey layered morphology with Im3 symmetry, which lacks one mirror reflection compared with Im3m symmetry. Also, a peculiar cubic bicontinuous morphology, whose channels are connected with tetrapod units, is found to have Pn3m symmetry. It is shown that there is another network morphology with tripod connections, which reveals P432 symmetry. The optimized free energies of these new mesophases and their relative stability are discussed in comparison with those of double gyroids and double diamonds.
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Affiliation(s)
- Junhan Cho
- Department of Polymer Science & Engineering and Center for Photofunctional Energy Materials, Dankook University, 152 Jukjeon-ro, Suji-gu, Yongin-si, Gyeonggi-do 16890, Korea.
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Lee J, Wang T, Shin K, Cho J. High-pressure neutron scattering and random-phase approximation analysis of a molten Baroplastic diblock copolymer. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.05.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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10
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Mulhearn WD, Register RA. Lower Critical Ordering Transition of an All-Hydrocarbon Polynorbornene Diblock Copolymer. ACS Macro Lett 2017. [DOI: 10.1021/acsmacrolett.7b00443] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- William D. Mulhearn
- Department of Chemical and
Biological Engineering, Princeton University, Princeton, New Jersey 08544, United States
| | - Richard A. Register
- Department of Chemical and
Biological Engineering, Princeton University, Princeton, New Jersey 08544, United States
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11
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12
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Direction and pressure response of osmotic pressure in binary polymer solutions. Macromol Res 2016. [DOI: 10.1007/s13233-017-5003-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Zong J, Wang Q. On the order-disorder transition of compressible diblock copolymer melts. J Chem Phys 2015; 143:184903. [DOI: 10.1063/1.4934992] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jing Zong
- Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, Colorado 80523-1370, USA
| | - Qiang Wang
- Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, Colorado 80523-1370, USA
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Lee Y, Lee H, Kim SW, Park S, Kim E, Han YS, Ryu DY. Baroplastic behavior of miscible block copolymer blends. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.11.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Affiliation(s)
- Junhan Cho
- Department of Polymer Science and Engineering; Center for Photofunctional Energy Materials; Dankook University; 152 Jukjeon-ro, Suji-Gu Yongin-Si Gyeonggi-Do 448-701 Korea
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Jha KC, Tsige M. MOLECULAR MODELING OF THERMAL AND MECHANICAL PROPERTIES OF ELASTOMERS: A REVIEW. RUBBER CHEMISTRY AND TECHNOLOGY 2013. [DOI: 10.5254/rct.13.86985] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
ABSTRACT
Elastomers have varied applications from adhesives, sealants, encapsulants, and coatings to specialty usage in electronics, aviation, optical, and communications industries due to their high structural stability. In addition, more and more biological applications of elastomeric compounds are gaining ground, particularly in mimetic architecture. Modeling and simulation provide tools by which the interactions leading to various structure–property relationships can be explored at the micro level. An understanding of these processes could cut down on the extensive and expensive trial-and-error experiments as well as provide a benchmark for material design. This review article explores the work done by different groups, especially at the molecular level, to model the properties of both thermoplastic and thermoset elastomers. Each presents its own challenges and solutions: from microphase separation to network building and force field parameterization. The results of these modeling efforts along with the challenges are presented in this review work.
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Affiliation(s)
- Kshitij C. Jha
- Department of Polymer Science, The University of Akron, Akron, OH 44304
| | - Mesfin Tsige
- Department of Polymer Science, The University of Akron, Akron, OH 44304
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20
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Cho J. Superposition in Flory-Huggins χ and Interfacial Tension for Compressible Polymer Blends. ACS Macro Lett 2013; 2:544-549. [PMID: 35581815 DOI: 10.1021/mz400111x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We investigate theoretically the response of interfacial tension γ for compressible polymer blends to thermodynamic variables. Helfand's self-consistent field theory is first extended to be combined with an off-lattice equation-of-state model to describe compressibility. Typical incompatible blends reveal that the effects of temperature and pressure (T-P) on γ are superposed into a single curve by a dimensionless pressure variable through the superposition in Flory-Huggins χ and density. In the case of polymer blends with strong compressibility difference, γ shows an anomaly upon pressurization with no T-P superposition, even though χ still follows the superposition.
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Affiliation(s)
- Junhan Cho
- Department of Polymer Science & Engineering and Center for Photofunctional Energy Materials, Dankook University, 126 Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Korea
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21
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Cho J. Hartree analysis of χ for a pressure-responsive diblock copolymer: Temperature-pressure superposition. Macromol Res 2012. [DOI: 10.1007/s13233-012-0139-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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22
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Anomaly in SANS χ for polydisperse polystyrene-b-poly(isooctyl acrylate). POLYMER 2012. [DOI: 10.1016/j.polymer.2012.03.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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25
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Lee J, Ryu DY, Cho J. Temperature−Pressure Superposition in SANS χ for an A-b-B Diblock Copolymer. Macromolecules 2011. [DOI: 10.1021/ma102102x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jumi Lee
- Department of Polymer Science & Engineering and Center for Photofunctional Energy Materials, Dankook University, 126 Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Korea
| | - Du Yeol Ryu
- Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsan-no, Seodaemun-gu, Seoul 120-749 Korea
| | - Junhan Cho
- Department of Polymer Science & Engineering and Center for Photofunctional Energy Materials, Dankook University, 126 Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Korea
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Chen W, Wei X, Balazs AC, Matyjaszewski K, Russell TP. Phase Behavior and Photoresponse of Azobenzene-Containing Polystyrene-block-poly(n-butyl methacrylate) Block Copolymers. Macromolecules 2011. [DOI: 10.1021/ma101982u] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wei Chen
- Department of Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Xinyu Wei
- Department of Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Anna C. Balazs
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, United States
| | - Krzysztof Matyjaszewski
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Thomas P. Russell
- Department of Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003, United States
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27
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Lee J, Cho J. Driving force for phase segregation in polymer mixtures. Macromol Res 2011. [DOI: 10.1007/s13233-011-0204-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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28
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Chen W, Wang JY, Wei X, Xu J, Balazs AC, Matyjaszewski K, Russell TP. UV-enhanced Ordering in Azobenzene-Containing Polystyrene-block-Poly(n-Butyl Methacrylate) Copolymer Blends. Macromolecules 2010. [DOI: 10.1021/ma102005s] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wei Chen
- Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Jia-Yu Wang
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Xinyu Wei
- Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Ji Xu
- Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Anna C. Balazs
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Krzysztof Matyjaszewski
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Thomas P. Russell
- Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
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29
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Moon HC, Han SH, Kim JK, Cho J. Tuning the Phase Behavior of Polystyrene-block-poly(n-alkyl methacrylate) Copolymers by Introducing Random Copolymer for Methacrylate Block. Macromolecules 2009. [DOI: 10.1021/ma9007016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hong Chul Moon
- National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784, Republic of Korea
| | - Sung Hyun Han
- National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784, Republic of Korea
| | - Jin Kon Kim
- National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784, Republic of Korea
| | - Junhan Cho
- Department of Polymer Science and Engineering and Center for Photofunctinal Energy Materials, Dankook University, 126 Jukjeon-dong, Yongin-si, Gyeonggi-do 448-701, Korea
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30
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Nedoma AJ, Robertson ML, Wanakule NS, Balsara NP. Measurements of the Composition and Molecular Weight Dependence of the Flory−Huggins Interaction Parameter. Macromolecules 2008. [DOI: 10.1021/ma800698r] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alisyn J. Nedoma
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720; and Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Megan L. Robertson
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720; and Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Nisita S. Wanakule
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720; and Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Nitash P. Balsara
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720; and Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
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Cho J, Shin K, Cho KS, Seo YS, Satija SK, Ryu DY, Kim JK. Phase Coherence upon Heating in Diblock Copolymer Films. Macromolecules 2008. [DOI: 10.1021/ma071604r] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Cho
- Department of Polymer Science and Engineering, Dankook University and Hyperstructured Organic Materials Research Center, San 44-1, Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Korea, Department of Chemistry and Program of Integrated Biotechnology, Sogang University, Sinsu-dong, Mapo-gu, Seoul 121-742, Korea, Department of Polymer Science and Engineering, Kyungpook National University, 1370, Sangyuk-dong, Bukgu, Daeku 702-701, Korea, Department of Nano Science and Technology, Sejong University,
| | - K. Shin
- Department of Polymer Science and Engineering, Dankook University and Hyperstructured Organic Materials Research Center, San 44-1, Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Korea, Department of Chemistry and Program of Integrated Biotechnology, Sogang University, Sinsu-dong, Mapo-gu, Seoul 121-742, Korea, Department of Polymer Science and Engineering, Kyungpook National University, 1370, Sangyuk-dong, Bukgu, Daeku 702-701, Korea, Department of Nano Science and Technology, Sejong University,
| | - K. S. Cho
- Department of Polymer Science and Engineering, Dankook University and Hyperstructured Organic Materials Research Center, San 44-1, Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Korea, Department of Chemistry and Program of Integrated Biotechnology, Sogang University, Sinsu-dong, Mapo-gu, Seoul 121-742, Korea, Department of Polymer Science and Engineering, Kyungpook National University, 1370, Sangyuk-dong, Bukgu, Daeku 702-701, Korea, Department of Nano Science and Technology, Sejong University,
| | - Y.-S. Seo
- Department of Polymer Science and Engineering, Dankook University and Hyperstructured Organic Materials Research Center, San 44-1, Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Korea, Department of Chemistry and Program of Integrated Biotechnology, Sogang University, Sinsu-dong, Mapo-gu, Seoul 121-742, Korea, Department of Polymer Science and Engineering, Kyungpook National University, 1370, Sangyuk-dong, Bukgu, Daeku 702-701, Korea, Department of Nano Science and Technology, Sejong University,
| | - S. K. Satija
- Department of Polymer Science and Engineering, Dankook University and Hyperstructured Organic Materials Research Center, San 44-1, Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Korea, Department of Chemistry and Program of Integrated Biotechnology, Sogang University, Sinsu-dong, Mapo-gu, Seoul 121-742, Korea, Department of Polymer Science and Engineering, Kyungpook National University, 1370, Sangyuk-dong, Bukgu, Daeku 702-701, Korea, Department of Nano Science and Technology, Sejong University,
| | - D. Y. Ryu
- Department of Polymer Science and Engineering, Dankook University and Hyperstructured Organic Materials Research Center, San 44-1, Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Korea, Department of Chemistry and Program of Integrated Biotechnology, Sogang University, Sinsu-dong, Mapo-gu, Seoul 121-742, Korea, Department of Polymer Science and Engineering, Kyungpook National University, 1370, Sangyuk-dong, Bukgu, Daeku 702-701, Korea, Department of Nano Science and Technology, Sejong University,
| | - J. K. Kim
- Department of Polymer Science and Engineering, Dankook University and Hyperstructured Organic Materials Research Center, San 44-1, Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do 448-701, Korea, Department of Chemistry and Program of Integrated Biotechnology, Sogang University, Sinsu-dong, Mapo-gu, Seoul 121-742, Korea, Department of Polymer Science and Engineering, Kyungpook National University, 1370, Sangyuk-dong, Bukgu, Daeku 702-701, Korea, Department of Nano Science and Technology, Sejong University,
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33
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Ryu DY, Shin C, Cho J, Lee DH, Kim JK, Lavery KA, Russell TP. Effective Interaction Parameter for Homologous Series of Deuterated Polystyrene-block-Poly(n-alkyl methacrylate) Copolymers. Macromolecules 2007. [DOI: 10.1021/ma070754z] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Du Yeol Ryu
- Department of Chemical Engineering, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, Korea, Department of Polymer Science & Engineering, and Hyperstuructured Organic Materials Research Center, Dankook University, San-8, Hannam-dong, Yongsan-gu, Seoul 140-714, Korea, National Creative Research Initiative Center for Block Copolymer Self Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk, 790-784, Korea, and
| | - Changhak Shin
- Department of Chemical Engineering, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, Korea, Department of Polymer Science & Engineering, and Hyperstuructured Organic Materials Research Center, Dankook University, San-8, Hannam-dong, Yongsan-gu, Seoul 140-714, Korea, National Creative Research Initiative Center for Block Copolymer Self Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk, 790-784, Korea, and
| | - Junhan Cho
- Department of Chemical Engineering, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, Korea, Department of Polymer Science & Engineering, and Hyperstuructured Organic Materials Research Center, Dankook University, San-8, Hannam-dong, Yongsan-gu, Seoul 140-714, Korea, National Creative Research Initiative Center for Block Copolymer Self Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk, 790-784, Korea, and
| | - Dong Hyun Lee
- Department of Chemical Engineering, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, Korea, Department of Polymer Science & Engineering, and Hyperstuructured Organic Materials Research Center, Dankook University, San-8, Hannam-dong, Yongsan-gu, Seoul 140-714, Korea, National Creative Research Initiative Center for Block Copolymer Self Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk, 790-784, Korea, and
| | - Jin Kon Kim
- Department of Chemical Engineering, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, Korea, Department of Polymer Science & Engineering, and Hyperstuructured Organic Materials Research Center, Dankook University, San-8, Hannam-dong, Yongsan-gu, Seoul 140-714, Korea, National Creative Research Initiative Center for Block Copolymer Self Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk, 790-784, Korea, and
| | - Kristopher A. Lavery
- Department of Chemical Engineering, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, Korea, Department of Polymer Science & Engineering, and Hyperstuructured Organic Materials Research Center, Dankook University, San-8, Hannam-dong, Yongsan-gu, Seoul 140-714, Korea, National Creative Research Initiative Center for Block Copolymer Self Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk, 790-784, Korea, and
| | - Thomas P. Russell
- Department of Chemical Engineering, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, Korea, Department of Polymer Science & Engineering, and Hyperstuructured Organic Materials Research Center, Dankook University, San-8, Hannam-dong, Yongsan-gu, Seoul 140-714, Korea, National Creative Research Initiative Center for Block Copolymer Self Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk, 790-784, Korea, and
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34
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Effective Flory interaction parameter and disparity in equation-of-state properties for block copolymers. POLYMER 2007. [DOI: 10.1016/j.polymer.2006.11.056] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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35
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Kim EY, Lee DJ, Kim JK, Cho J. Phase Behavior of a Binary Mixture of a Block Copolymer with Lower Disorder-to-Order Transition and a Homopolymer. Macromolecules 2006. [DOI: 10.1021/ma0617567] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eun Young Kim
- National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science & Technology, Kyungbuk 790-784, Korea
| | - Dong Jun Lee
- National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science & Technology, Kyungbuk 790-784, Korea
| | - Jin Kon Kim
- National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science & Technology, Kyungbuk 790-784, Korea
| | - Junhan Cho
- Department of Polymer Science and Engineering, Dankook University, Hyperstructured Organic Materials Research Center, Seoul 140-714, Korea
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36
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Spiro JG, Yang J, Zhang JX, Winnik MA, Rharbi Y, Vavasour JD, Whitmore MD, Jérôme R. Experimental and Theoretical Investigation of the Lamellar Structure of a Styrene−Butyl Methacrylate Diblock Copolymer by Fluorescence Resonance Energy Transfer, Small-Angle X-ray Scattering, and Self-Consistent-Field Simulations. Macromolecules 2006. [DOI: 10.1021/ma0526037] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | | | - Yahya Rharbi
- Laboratoire de Rhéologie, BP53-Domaine Universitaire, 38041 Grenoble Cedex 9, France, and Department of Chemistry, University of Toronto, 80 St. George St., Toronto, Ontario, Canada M5S 3H6
| | | | | | - Robert Jérôme
- Center for Education and Research on Macromolecules, University of Liège, Sart-Tilman B6, 4000 Liège, Belgium
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37
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Cho J, Wang ZG. A Simple Field-Theoretic Simulation Method for Compressible Block Copolymer Systems. Macromolecules 2006. [DOI: 10.1021/ma052565r] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Junhan Cho
- Department of Polymer Science and Engineering, and Hyperstructured Organic Materials Research Center, Dankook University, San-8, Hannam-dong, Yongsan-gu, Seoul, 140-714, Korea, and Department of Chemical Engineering, California Institute of Technology, Pasadena, California 91125
| | - Zhen-Gang Wang
- Department of Polymer Science and Engineering, and Hyperstructured Organic Materials Research Center, Dankook University, San-8, Hannam-dong, Yongsan-gu, Seoul, 140-714, Korea, and Department of Chemical Engineering, California Institute of Technology, Pasadena, California 91125
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38
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Browarzik D. Calculation of the Phase Behavior of Polystyrene+Poly(N‐Pentyl Methacrylate) Blends. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2005. [DOI: 10.1080/10601320500204858] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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39
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Cho J. Effects of Fluctuations and Compressibility on the Phase Behavior of Loop-Forming Diblock Copolymers. Macromolecules 2004. [DOI: 10.1021/ma0483569] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Junhan Cho
- Department of Polymer Science & Engineering, and Hyperstuructured Organic Materials Research Center, Dankook University, San-8, Hannam-dong, Yongsan-gu, Seoul 140-714, Korea
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40
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Ryu DY, Lee DH, Jang J, Kim JK, Lavery KA, Russell TP. Complex Phase Behavior of a Weakly Interacting Binary Polymer Blend. Macromolecules 2004. [DOI: 10.1021/ma049329l] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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42
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Cho J. Concentration fluctuation effects on the phase behavior of compressible diblock copolymers. J Chem Phys 2004; 120:9831-40. [PMID: 15268000 DOI: 10.1063/1.1724819] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A Hartree analysis has been performed for compressible diblock copolymers of incompatible pairs to investigate the concentration fluctuation effects on their microphase separation behavior. The free energy in the Hartree analysis is obtained from the self-consistent correction to its mean-field cousin, which was recently formulated for such copolymer systems. The mean-field phase diagram is shown to be significantly affected by the fluctuation effects as the copolymer chain size N is lowered. An effective interaction chi(cRPA), which carries not only the change in contact interactions but also the compressibility difference between block components, plays a key role in understanding of the phase behavior and the pressure responses of various thermodynamic transitions for the copolymers with finite sizes. In particular, a symmetric copolymer at disorder-to-lamella transition is found to satisfy Nchi(cRPA)(q*)=10.495+41.022N(-1/3) when evaluated at a characteristic wave number q* for ordered microphases.
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Affiliation(s)
- Junhan Cho
- Department of Polymer Science and Engineering, and Hyperstructured Organic Materials Research Center, Dankook University, San-8, Hannam-dong, Yongsan-gu, Seoul 140-714, Korea
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43
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Ryu DY, Lee DH, Jeong U, Yun SH, Park S, Kwon K, Sohn BH, Chang T, Kim JK, Russell TP. Closed-Loop Phase Behavior of Polystyrene-block-poly(n-pentyl methacrylate) Copolymers with Various Block Length Ratios. Macromolecules 2004. [DOI: 10.1021/ma049746y] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Du Yeol Ryu
- Departments of Chemical Engineering, Materials Science and Engineering, and Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Dong Hyun Lee
- Departments of Chemical Engineering, Materials Science and Engineering, and Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Unyong Jeong
- Departments of Chemical Engineering, Materials Science and Engineering, and Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Sang-Hyun Yun
- Departments of Chemical Engineering, Materials Science and Engineering, and Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Soojin Park
- Departments of Chemical Engineering, Materials Science and Engineering, and Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Kyoon Kwon
- Departments of Chemical Engineering, Materials Science and Engineering, and Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Byeong-Hyeok Sohn
- Departments of Chemical Engineering, Materials Science and Engineering, and Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Taihyun Chang
- Departments of Chemical Engineering, Materials Science and Engineering, and Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Jin Kon Kim
- Departments of Chemical Engineering, Materials Science and Engineering, and Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Thomas P. Russell
- Department of Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003
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44
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RamachandraRao VS, Vogt BD, Gupta RR, Watkins JJ. Effect of carbon dioxide sorption on the phase behavior of weakly interacting polymer mixtures: Solvent-induced segregation in deuterated polybutadiene/polyisoprene blends. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/polb.10633] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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45
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Cho J. A Landau free energy for diblock copolymers with compressibility difference between blocks. J Chem Phys 2003. [DOI: 10.1063/1.1599278] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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46
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Cho J, Kwon YK. Mean-field and fluctuation correction analyses for a diblock copolymer melt exhibiting an immiscibility loop. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/polb.10560] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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47
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Ryu DY, Lee DJ, Kim JK, Lavery KA, Russell TP, Han YS, Seong BS, Lee CH, Thiyagarajan P. Effect of hydrostatic pressure on closed-loop phase behavior of block copolymers. PHYSICAL REVIEW LETTERS 2003; 90:235501. [PMID: 12857269 DOI: 10.1103/physrevlett.90.235501] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2003] [Indexed: 05/24/2023]
Abstract
The effect of hydrostatic pressure (P) on closed-loop phase behavior of deuterated polystyrene-block-poly(n-pentyl methacrylate) copolymers [dPS-PnPMA] was investigated by using small-angle neutron scattering and birefringence. For P<20.7 bar, dPS-PnPMA exhibited a lower disorder-to-order transition temperature (T(LDOT)) at 175 degrees C, and then an upper order-to-disorder transition temperature (T(UODT)) at 255 degrees C. With increasing pressure both T(LDOT) and T(UODT) were markedly changed, where dT(LDOT)/dP was 725 degrees C/kbar and dT(UODT)/dP was -725 degrees C/kbar. These are consistent with predictions by the Clausius-Clapeyron equation using measured values of the volume and enthalpy changes of both transitions. The large pressure coefficients imply that the closed-loop phase behavior observed for PS-PnPMA is an entropic-driven phase transition.
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Affiliation(s)
- Du Yeol Ryu
- Department of Chemical Engineering and Polymer Research Institute, Electronic and Computer Engineering Divisions, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
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48
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Vogt BD, RamachandraRao VS, Gupta RR, Lavery KA, Francis TJ, Russell TP, Watkins JJ. Phase Behavior of Polystyrene-block-poly(n-alkyl methacrylate)s Dilated with Carbon Dioxide. Macromolecules 2003. [DOI: 10.1021/ma0300544] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bryan D. Vogt
- Departments of Chemical Engineering and Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003
| | - Vijayakumar S. RamachandraRao
- Departments of Chemical Engineering and Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003
| | - Ravi R. Gupta
- Departments of Chemical Engineering and Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003
| | - Kristopher A. Lavery
- Departments of Chemical Engineering and Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003
| | - Timothy J. Francis
- Departments of Chemical Engineering and Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003
| | - Thomas P. Russell
- Departments of Chemical Engineering and Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003
| | - James J. Watkins
- Departments of Chemical Engineering and Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003
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49
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Ryu DY, Jeong U, Lee DH, Kim J, Youn HS, Kim JK. Phase Behavior of Deuterated Polystyrene-block-poly(n-pentyl methacrylate) Copolymers. Macromolecules 2003. [DOI: 10.1021/ma026002g] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Du Yeol Ryu
- Department of Chemical Engineering and Polymer Research Institute, Electronic and Computer Engineering Divisions, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Unyong Jeong
- Department of Chemical Engineering and Polymer Research Institute, Electronic and Computer Engineering Divisions, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Dong Hyun Lee
- Department of Chemical Engineering and Polymer Research Institute, Electronic and Computer Engineering Divisions, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Jehan Kim
- Department of Chemical Engineering and Polymer Research Institute, Electronic and Computer Engineering Divisions, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Hwa Shik Youn
- Department of Chemical Engineering and Polymer Research Institute, Electronic and Computer Engineering Divisions, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Jin Kon Kim
- Department of Chemical Engineering and Polymer Research Institute, Electronic and Computer Engineering Divisions, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
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50
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Ryu DY, Park MS, Chae SH, Jang J, Kim JK, Russell TP. Phase Behavior of Polystyrene and Poly(n-pentyl methacrylate) Blend. Macromolecules 2002. [DOI: 10.1021/ma025615q] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Du Yeol Ryu
- Department of Chemical Engineering, Polymer Research Institute, Electronic and Computer Engineering Divisions, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Min Soo Park
- Department of Chemical Engineering, Polymer Research Institute, Electronic and Computer Engineering Divisions, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Seung Hun Chae
- Department of Chemical Engineering, Polymer Research Institute, Electronic and Computer Engineering Divisions, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Jin Jang
- Department of Chemical Engineering, Polymer Research Institute, Electronic and Computer Engineering Divisions, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Jin Kon Kim
- Department of Chemical Engineering, Polymer Research Institute, Electronic and Computer Engineering Divisions, Pohang University of Science and Technology, Kyungbuk 790-784, Korea
| | - Thomas P. Russell
- Department of Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003
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