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You searched for +publisher:"Clemson University" +contributor:("Marek W Urban"). Showing records 1 – 3 of 3 total matches.

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Clemson University

1. Murdaugh, Amy. Modeling and Optimization of Self-Healing Polymers.

Degree: MS, Mathematical Sciences, 2020, Clemson University

Continuous interests in developing self-healable polymers are driven by the desire to extend life spans of existing functional materials. Combining mathematical modeling and optimization approaches with experimental studies, an ultimate aim is to predict the flow and macroscopic wound closures in polymeric materials. Corresponding numerical simulations to experimental results are presented, utilizing two mathematical models that describe bulk or layer flow. An optimization routine for this self-healing process is described and implemented using two different approaches, competitive with each other with respect to accuracy. Finally a multi-layer model is simulated to show the flow profile of multiple layers rather than a single surface one. Advisors/Committee Members: Margaret M Wiecek, Marek W Urban.

Subjects/Keywords: numerical modeling; optimization; self-healable polymers; thin-film equation

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APA (6th Edition):

Murdaugh, A. (2020). Modeling and Optimization of Self-Healing Polymers. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/3285

Chicago Manual of Style (16th Edition):

Murdaugh, Amy. “Modeling and Optimization of Self-Healing Polymers.” 2020. Masters Thesis, Clemson University. Accessed September 21, 2020. https://tigerprints.clemson.edu/all_theses/3285.

MLA Handbook (7th Edition):

Murdaugh, Amy. “Modeling and Optimization of Self-Healing Polymers.” 2020. Web. 21 Sep 2020.

Vancouver:

Murdaugh A. Modeling and Optimization of Self-Healing Polymers. [Internet] [Masters thesis]. Clemson University; 2020. [cited 2020 Sep 21]. Available from: https://tigerprints.clemson.edu/all_theses/3285.

Council of Science Editors:

Murdaugh A. Modeling and Optimization of Self-Healing Polymers. [Masters Thesis]. Clemson University; 2020. Available from: https://tigerprints.clemson.edu/all_theses/3285


Clemson University

2. Liu, Xiaolin. Synthesis of Hydrofluorocarbon Ethers and New Amorphous Fluoropolymers with Cyclic Fluorocarbon Ether Units.

Degree: PhD, School of Materials Science and Engineering, 2016, Clemson University

The main focus of this work is the synthesis of hydrofluorocarbon ethers (HFEs). New synthetic methods and new HFEs were successfully developed. In Chapter 1, new HFEs were synthesized with tetrafluoroethylene (CF2=CF2, TFE) as new engineered fluids. The fluorinated olefins’ addition to alcohols is a more conventional approach to HFEs, and in our group a synthetic method consists of three steps was attempted: a. radical addition of tetrafluoroethylene (TFE) to 2,2-dimethyl-1,3-dioxolane compound; b. hydrolysis of the fluorinated dioxolane compound to make a diol; c. TFE addition to the diol under ionic condition. The following two chapters cover the synthesis of several other HFEs with a strong Lewis acid. Especially the one-step synthesis of sevoflurane starting from hexafluoroisopropanol (HFIP) and difluoromethane (R32) with SbF5 as catalyst gives 95+% yield which is very attractive to industry, meanwhile the catalysts can be recycled for multiple reactions. Several other existing or new HFEs were also synthesized by using the same method. The products were identified with NMR spectroscopy and gas chromatography/mass spectrometry. Another cyclic hydrofluorocarbon ether compound 2,2,5,5-tetrafluoro-2,5-dihydrofuran (M1) was synthesized as a monomer for the development of new amorphous fluoropolymers. M1 has been successfully copolymerized with several perfluoro olefins including CF2=CF2 (TFE), CF3CF=CF2 (HFP), and SF5CF=CF2 (MSF5). And the materials were characterized and analyzed by NMR spectroscopy, attenuated total reflectance-infrared spectroscopy (ATR-IR), thermalgravimetric analysis/mass spectrometry (TGA/MS), scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDX), gel permeation chromatography (GPC) and static light scattering (SLS). Along the work of the polymerization of M1, more chemistry has been explored on M1 and several crystal structures were solved, which will be further discussed in Chapter 5 and Chapter 6. In the crystal structures, a variety of short distance contacts of Ag – Ag, Ag – O, H – F, O – F, O-Cl, and F – F, were observed. Two other bissulfonyl chloride compounds were synthesized and in the structure of these two -SO2Cl containing molecules, Cl – O and F – F short contacts were observed and considered as halogen bonding. Advisors/Committee Members: Joseph S Thrasher, Marek W Urban, Gary C Lickfield, Stephen H Foulger.

Subjects/Keywords: amorphous fluoropolymer; argentophilic; fluorocarbon ether; halogen bonding

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APA (6th Edition):

Liu, X. (2016). Synthesis of Hydrofluorocarbon Ethers and New Amorphous Fluoropolymers with Cyclic Fluorocarbon Ether Units. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/2539

Chicago Manual of Style (16th Edition):

Liu, Xiaolin. “Synthesis of Hydrofluorocarbon Ethers and New Amorphous Fluoropolymers with Cyclic Fluorocarbon Ether Units.” 2016. Doctoral Dissertation, Clemson University. Accessed September 21, 2020. https://tigerprints.clemson.edu/all_dissertations/2539.

MLA Handbook (7th Edition):

Liu, Xiaolin. “Synthesis of Hydrofluorocarbon Ethers and New Amorphous Fluoropolymers with Cyclic Fluorocarbon Ether Units.” 2016. Web. 21 Sep 2020.

Vancouver:

Liu X. Synthesis of Hydrofluorocarbon Ethers and New Amorphous Fluoropolymers with Cyclic Fluorocarbon Ether Units. [Internet] [Doctoral dissertation]. Clemson University; 2016. [cited 2020 Sep 21]. Available from: https://tigerprints.clemson.edu/all_dissertations/2539.

Council of Science Editors:

Liu X. Synthesis of Hydrofluorocarbon Ethers and New Amorphous Fluoropolymers with Cyclic Fluorocarbon Ether Units. [Doctoral Dissertation]. Clemson University; 2016. Available from: https://tigerprints.clemson.edu/all_dissertations/2539


Clemson University

3. Lu, Chunliang. Anisotropic Stimuli-Responsive Polymeric Nanoparticles: Synthesis and Characterization.

Degree: PhD, Materials Science and Engineering, 2015, Clemson University

This dissertation focuses on the design, synthesis and characterization of stimuli-responsive anisotropic nanoparticles with various morphologies. Size- and shape-tunable Janus nanoparticles consisting of poly(methyl methacrylate/n-butyl acrylate) (p(MMA/nBA)), poly(pentafluorostyrene/nBA) (p(PFS/nBA) and poly(2-(N,N′-dimethylamino) ethyl methacrylate/nBA) (p(DMAEMA/nBA)) phases were synthesized via consecutive seeded emulsion polymerization. These Janus nanoparticles are capable of changing size and morphology in response of temperature and/or pH changes, which may have potential applications as solid surfactants. Gibbous and inverse-gibbous nanoparticles were synthesized viacopolymerization of fluorinated monomers in the presence of pMMA or polystyrene (pSt) seed particles. The morphology of the gibbous nanoparticles can be controlled by polymerization conditions. Incorporation and copolymerization of methacrylic acid (pMAA) components results in pH-responsive gibbous nanoparticles with numerous size-tunable bulges. In addition, the gibbous and inverse-gibbous nanoparticles can be controlled to self-assemble in solutions but upon evaporation of solvents form two- and three-dimensional assemblies stabilized by electrostatic interactions and shape-matching topographies. Taking advantage of the heterogeneous nature of emulsion polymerization, surfactant free heterogeneous radical polymerization (SFHRP) was developed to synthesize ultra-high molecular weight amphiphilic block copolymers. This is one-step process of preparing block copolymer morphologies. The amphiphilic block copolymers can form thermochromic inverse micelles in organic solvents, capable of selectively scattering light as a function of temperature. The approach was also utilized to synthesize polymer nanowires via in-situ self-assembly of amphiphilic block copolymers. This kinetically controlled directional growth may lead to many industrial applications, including synthesis of other block copolymers, polymeric nanowire latexes and other morphologies. Advisors/Committee Members: Dr. Marek W. Urban, Committee Chair, Dr. Igor Luzinov, Dr. Olin Thompson Mefford, Dr. Mark Roberts.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lu, C. (2015). Anisotropic Stimuli-Responsive Polymeric Nanoparticles: Synthesis and Characterization. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1771

Chicago Manual of Style (16th Edition):

Lu, Chunliang. “Anisotropic Stimuli-Responsive Polymeric Nanoparticles: Synthesis and Characterization.” 2015. Doctoral Dissertation, Clemson University. Accessed September 21, 2020. https://tigerprints.clemson.edu/all_dissertations/1771.

MLA Handbook (7th Edition):

Lu, Chunliang. “Anisotropic Stimuli-Responsive Polymeric Nanoparticles: Synthesis and Characterization.” 2015. Web. 21 Sep 2020.

Vancouver:

Lu C. Anisotropic Stimuli-Responsive Polymeric Nanoparticles: Synthesis and Characterization. [Internet] [Doctoral dissertation]. Clemson University; 2015. [cited 2020 Sep 21]. Available from: https://tigerprints.clemson.edu/all_dissertations/1771.

Council of Science Editors:

Lu C. Anisotropic Stimuli-Responsive Polymeric Nanoparticles: Synthesis and Characterization. [Doctoral Dissertation]. Clemson University; 2015. Available from: https://tigerprints.clemson.edu/all_dissertations/1771

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