Pressure-Property Relationships in High-Performance Elastomers

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dc.contributor.advisorKrishnamoorti, Ramanan
dc.contributor.committeeMemberKarim, Alamgir
dc.contributor.committeeMemberRobertson, Megan L.
dc.contributor.committeeMemberBhowmick, Anil K.
dc.contributor.committeeMemberChen, Xuming
dc.creatorCai, Micheal
dc.creator.orcid0000-0002-6388-6553
dc.date.accessioned2023-06-02T17:47:25Z
dc.date.createdDecember 2022
dc.date.issued2022-12-14
dc.date.updated2023-06-02T17:47:26Z
dc.description.abstractHigh-performance elastomers, hydrogenated nitrile butadiene (HNBR), and fluoroelastomer (FKM), widely used in high pressure gas environments, have attracted significant interest from both fundamental research and industrial development. The changes in the glass transition temperature (Tg) and gas sorption behavior of elastomers due to high-pressure gases can have important consequences on their mechanical, physical, and thermal properties. Therefore, it is crucial to understand the effect of pressure on the structure and properties of the elastomer in terms of Tg and gas transport behavior. In the first approach, the behavior of Tg of the HNBR system under pressure, and its relationship with gas solubility, crosslink density, loading and types of filler, and chemical structure under pressure, were investigated. It was observed that absorbed gas molecules have a significant impact on the change of Tg with pressure. We note that the Tg of the uncrosslinked HNBR decreased with increased pressure of N2 and was accompanied by increased solubility of N2 gas in the elastomer. However, with increased crosslink density, filler content, and acrylonitrile (ACN) content in the HNBR, Tg values increased and N2 gas solubility decreased with increased pressure However, changes in gas transport properties as a function of pressure are poorly understood. Here, we quantitatively investigated how gas sorption changes as a function of pressure and temperature in FKM. In this work, we investigated the effect of pressure and temperature on CO2 and N2 gas sorption. The kinetics of sorption for both gases was modeled and analyzed. In addition, the impact of pressure and temperature on the diffusivity and permeability of gases in FKMs has been quantitatively interpreted. The solubility and diffusivity of gases decrease by increasing carbon black loading up to 40 wt% at 50 °C. Moreover, the correlation between gas molecular properties and transport properties of gases in FKM was quantitatively investigated. Together, this work further expands the scientific knowledge of the pressure effects on polymer Tg and gas sorption of elastomers in gas environments and provides insight into potential solutions for developing high performance elastomers for applications in high pressure gas environments.
dc.description.departmentChemical and Biomolecular Engineering, William A. Brookshire Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.citationPortions of this document appear in: Cai, Le Michael, Kapil Surve, Jushik Yun, Alireza Zolfaghari, Xuming Chen, Anil K. Bhowmick, and Ramanan Krishnamoorti. "Effect of Pressure and Temperature on the Sorption of Gases by Fluoroelastomers." Industrial & Engineering Chemistry Research 61, no. 45 (2022): 16721-16732.
dc.identifier.urihttps://hdl.handle.net/10657/14394
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectHigh Pressure
dc.subjectPolymer
dc.subjectElastomers
dc.subjectGas-polymer interaction
dc.subjectGlass transition temperature
dc.subjectSolubility coefficient
dc.subjectDiffusion
dc.subjectPermeability
dc.subjectHNBR
dc.subjectFKM
dc.subjectNanoparticles
dc.subjectCarbon nanotube
dc.subjectNanographite
dc.subjectCarbon black
dc.subjectCarbon dioxide
dc.subjectNitrogen
dc.titlePressure-Property Relationships in High-Performance Elastomers
dc.type.dcmiText
dc.type.genreThesis
dcterms.accessRightsThe full text of this item is not available at this time because the student has placed this item under an embargo for a period of time. The Libraries are not authorized to provide a copy of this work during the embargo period.
local.embargo.lift2024-12-01
local.embargo.terms2024-12-01
thesis.degree.collegeCullen College of Engineering
thesis.degree.departmentChemical and Biomolecular Engineering, William A. Brookshire Department of
thesis.degree.disciplineMaterials Engineering
thesis.degree.grantorUniversity of Houston
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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