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Processing-Structure-Property Relationships in Polymer Carbon Nanocomposites

Danda, kranthi Chaitanya
http://rave.ohiolink.edu/etdc/view?acc_num=case156217449277816

Abstract Details

2019, Doctor of Philosophy, Case Western Reserve University, Macromolecular Science and Engineering.
This dissertation has a primary focus on design and development of composites by employing processing methods aimed at improving filler dispersion in polymers. Mixing elements taking advantage of extensional dominated flows are adopted. Several such mixing elements, extensional mixing elements (EMEs) to be specific, with varying degree of ability to impose extensional dominated flows, have been experimentally validated. A first attempt is made to enhance the dispersion of carbon black (CB), graphene nano platelets (GNP) and carbon nano tubes (CNT) in polypropylene (PP). Enhanced dispersion does translate into improved mechanical properties. A more comprehensive approach is adopted with an integrated computational and processing method on thermoplastic polyurethane (TPU) graphene oxide (GO) composites. The role of filler functionalization in exfoliation and TPU hard block crystallization is established. A difference in anisotropy and phase separation is observed between material processed with EME and kneading blocks. A significantly enhanced ductility is obtained by employing EME during processing. Improved abrasion and strength is also observed. A secondary focus of the thesis includes synthesis of composites by wet chemical and other processes to end up with composite materials with enhanced properties and/or improved material behavior. Hydrogels of poly(ethylene glycol) methyl ether methaycrylate filled with graphene oxide are made via a reversible assisted fragmentation termination (RAFT) approach. Reinforcement and lubrication effects are studied with the incorporation of covalent bonds between filler and matrix. Aerogels obtained from hydrogels of graphene oxide (GO) and montmorillonite (MMT) clay nanocomposites in poly(vinyl alcohol) are synthesized. Hence, obtained aerogels have improved compressive strength and further silylation makes them functional materials for oil-water separation. Twin-screw reactive extrusion of Thermoplastic polyurethane (TPU) compounded with trisilanol isooctyl polyhedral oligomeric silsesquioxane (POSS) chain extender results in a composite with covalently tethered filler on the polymer backbone. Morphological, spectroscopic and rheological characterization is performed to understand the relevant changes in composites as a function of concentration. Lastly, cyclodextrin based polymers are synthesized and tailored for their ability to deliver corticosteroids into knee cavity. The polymer system has been successfully formulated to mimic the synovial fluid behavior under shear imposed from bio-mechanical motion.  
Joao Maia (Advisor)
Manas-Zloczower Ica (Committee Member)
Dai Liming (Committee Member)
Lewandowski John (Committee Member)
200 p.
Analytical Chemistry; Chemistry; Design; Engineering; Materials Science; Nanoscience; Nanotechnology; Polymer Chemistry; Polymers
Polymer Composites; Twin screw extrusion; Polymer processing; TPU; Thermoplastic polyurethane; Polypropylene; Graphene oxide; Carbon black; Carbon nanotubes; POSS; Graphene nanoplatelets; Aerogels; Rheology; Hydrogel; Computational; Simulation; DPD

Recommended Citations

Citations

  • Danda, K. C. (2019). Processing-Structure-Property Relationships in Polymer Carbon Nanocomposites [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case156217449277816

    APA Style (7th edition)

  • Danda, kranthi. Processing-Structure-Property Relationships in Polymer Carbon Nanocomposites. 2019. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case156217449277816.

    MLA Style (8th edition)

  • Danda, kranthi. "Processing-Structure-Property Relationships in Polymer Carbon Nanocomposites." Doctoral dissertation, Case Western Reserve University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case156217449277816

    Chicago Manual of Style (17th edition)

case156217449277816
256
© 2019, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.