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519 results on '"Mays, Jimmy W."'

9. High-χ diblock copolymers containing poly(vinylpyridine-N-oxide) segments.

Author

Angelopoulou, Polyxeni P., Kearney, Logan T., Keum, Jong K., Collins, Liam, Kumar, Rajeev, Sakellariou, Georgios, Advincula, Rigoberto C., Mays, Jimmy W., and Hong, Kunlun

Abstract

Block copolymers exhibiting an enhanced segregation strength due to an underlying high Flory–Huggins interaction parameter (high χ) have attracted considerable attention because of their potential of forming microphase-separated domains with very small feature sizes (<10 nm) useful for next-generation lithography. Here, we report the synthesis, characterization, and self-assembly of poly(styrene)-block-poly(2-vinylpyridine N-oxide) (PS-b-P2VPNO) and poly(styrene)-block-poly(4-vinylpyridine N-oxide) (PS-b-P4VPNO) block copolymers. These PS-b-PVPNOs were obtained from the oxidation of their precursors, poly(styrene)-block-poly(2-vinylpyridine) (PS-b-P2VP) and poly(styrene)-block-poly(4-vinylpyridine) (PS-b-P4VP), respectively. The PS-b-PVPNOs exhibit an enhanced segregation as revealed by ordered cylindrical and lamellar structures in the sub-10 nm scale from copolymers with relatively low molecular weight. The morphologies and periodicities of the ordered structures were determined by small-angle X-ray scattering, while atomic-force microscopy was used to image the self-assembly in thin films. Estimates of the changes in disorder–order transition temperature and domain spacing are derived from a theory based on the effects of dipolar interactions. All the experimentally observed morphological changes resulting from the oxidation of P2VP and P4VP precursors can be qualitatively explained in terms of an increased dipole moment of vinylpyridine N-oxide segments. Our results demonstrate that PVPNO based block copolymers are versatile candidates toward nanopatterned structures with small feature sizes critical for the future microelectronics industry and beyond. [ABSTRACT FROM AUTHOR]

Published
2023
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13. Nonlinear Block Copolymer Architectures

Author

Pitsikalis, Marinos, Pispas, Stergios, Mays, Jimmy W., Hadjichristidis, Nikos, Abe, Akihiro, editor, Albertson, Ann-Christine, editor, Cantow, Hans-Joachim, editor, Dušek, Karel, editor, Edwards, Sam, editor, Höcker, Hartwig, editor, Joanny, J. F., editor, Kausch, Hans-Henning, editor, Kobayashi, T., editor, Lee, Kwang-Sup, editor, McGrath, J. E., editor, Monnerie, Lucien, editor, Stupp, Samuel I., editor, Suter, U. W., editor, Thomas, Edwin L., editor, Wegner, G., editor, Young, R. J., editor, Bellon-Maurel, V., editor, Calmon-Decriaud, A., editor, Chandrasekhar, V., editor, Hadjichristidis, N., editor, Mays, J. W., editor, Pispas, S., editor, Pitsikalis, M., editor, and Silvestre, F., editor

Published
1998
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26. A MALDI-TOF MS study of oligomeric poly(m-phenyleneisophthalamide)

Author

Gies, Anthony P., Nonidez, William K., Ellison, Sparkle T., Ji, Haining, and Mays, Jimmy W.

Subjects
Oligomers -- Research, Chemistry
Abstract

MALDI-TOF MS was used to study the end-group distribution of a series of poly(m-phenyleneisophthalamide) oligomers which were synthesized using various mole percent ratios of diamine to diacid chloride (90:10, 80:20, 70:30, 60:40, 50:50, 40:60, 30:70, 20:80, and 10:90) to clarify results obtained in previous work published in this journal. Oligomers synthesized with excess diamine or excess diacid chloride were found to contain abundances of amine or carboxylate end groups, respectively, as expected. Oligomers synthesized with equal molar ratios of reactants produced cyclic species which were also found in a previous publication as an oligomer in commercially produced, high molecular mass Nomex.

Published
2005

47. Influence of Chain Rigidity and Dielectric Constant on the Glass Transition Temperature in Polymerized Ionic Liquids

Author

Bocharova, V., Wojnarowska, Z., Cao, Peng-Fei, Fu, Y., Kumar, R., Li, Bingrui, Novikov, V. N., Zhao, S., Kisliuk, A., Saito, T., Mays, Jimmy W., Sumpter, B.G., and Sokolov, A. P.

Abstract

Polymerized ionic liquids (PolyILs) are promising candidates for a wide range of technological applications due to their single ion conductivity and good mechanical properties. Tuning the glass transition temperature (Tg) in these materials constitutes a major strategy to improve room temperature conductivity while controlling their mechanical properties. In this work, we show experimental and simulation results demonstrating that in these materials Tgdoes not follow a universal scaling behavior with the volume of the structural units Vm(including monomer and counterion). Instead, Tgis significantly influenced by the chain flexibility and polymer dielectric constant. We propose a simplified empirical model that includes the electrostatic interactions and chain flexibility to describe Tgin PolyILs. Our model enables design of new functional PolyILs with the desired Tg.

Published
2024
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49. Carbon Dioxide Separation: Highly Permeable Oligo(ethylene oxide)-co -poly(dimethylsiloxane) Membranes for Carbon Dioxide Separation (Adv. Sustainable Syst. 4/2018)

Author

Hong, Tao, primary, Lai, Sophia, additional, Mahurin, Shannon M., additional, Cao, Peng-Fei, additional, Voylov, Dmitry N., additional, Meyer, Harry M., additional, Jacobs, Christopher B., additional, Carrillo, Jan-Michael Y., additional, Kisliuk, Alexander, additional, Ivanov, Ilia N., additional, Jiang, De-en, additional, Long, Brian K., additional, Mays, Jimmy W., additional, Sokolov, Alexei P., additional, and Saito, Tomonori, additional

Published
2018
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