Phase Behavior of Polymer-Grafted Nanoparticles Blends Thin Film Induced by Solvent Annealing and Thermal Annealing

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dc.contributor.advisorKarim, Alamgir
dc.contributor.committeeMemberYu, Cunjiang
dc.contributor.committeeMemberShaffer, Devin L.
dc.creatorXiao, Zihan
dc.creator.orcid0000-0003-1437-2123
dc.date.accessioned2020-06-02T02:59:37Z
dc.date.createdMay 2020
dc.date.issued2020-05
dc.date.submittedMay 2020
dc.date.updated2020-06-02T02:59:38Z
dc.description.abstractThe grafting of polymer chains to nanoparticles has been found as an important method to control the particle assembly structures on a thin film state. We hypothesized that polymer-grafted nanoparticles blends have similar upper or lower critical solution temperature type phase behavior corresponding to linear polymer blends if the degree of polymerization is larger enough. UCST system we take is poly (methyl methacrylate) silica (PMMA-SiO2) and poly(styrene) silica (PS-SiO2), LCST system we take is PMMA-SiO2 and poly(styrene)-(acrylonitrile) silica (PSANSiO2). Direct immersion annealing (DIA) method was used in switching the state of phase-separated structures in a binary blend film of UCST system, and thermal annealing method was used for the LCST system. Our results show that by varying the composition of the DIA solution, interchangeable phase separation state and homogeneous state are formed in the PMMA-SiO2/PS-SiO2 blends thin film within 1 minute. The phase reversibility of UCST system is stable. Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) reveals that the switchable phase separation state for UCST system occurs all throughout the film. However, for LCST system, phase reversibility is not feasible. We hypothesized a layered structure may formed underneath the surface of the thin film for this phenomenon. We believe that the phase reversibility of PGNPs blends will play an important role in the future nanoparticle-based material science and engineering.
dc.description.departmentChemical and Biomolecular Engineering, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/10657/6560
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. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectPolymer-grafted nanoparticles, direct immersion annealing, thin film, phase reversibility, layer structure.
dc.titlePhase Behavior of Polymer-Grafted Nanoparticles Blends Thin Film Induced by Solvent Annealing and Thermal Annealing
dc.type.dcmiText
dc.type.genreThesis
local.embargo.lift2022-05-01
local.embargo.terms2022-05-01
thesis.degree.collegeCullen College of Engineering
thesis.degree.departmentChemical and Biomolecular Engineering, Department of
thesis.degree.disciplineMaterials Engineering
thesis.degree.grantorUniversity of Houston
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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