Exploring mechanics via structural interplay in supramolecular networks, melt-extruded fibers, and liquid crystal/polymer blends

Exploring mechanics via structural interplay in supramolecular networks, melt-extruded fibers, and liquid crystal/polymer blends

Bibliographic Details
Main Author: Jang, Keon-Soo
Language:English
Published: Case Western Reserve University School of Graduate Studies / OhioLINK 2016
Subjects:
Polymers
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=case1448900992
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-case14489009922021-08-03T06:34:09Z Exploring mechanics via structural interplay in supramolecular networks, melt-extruded fibers, and liquid crystal/polymer blends Jang, Keon-Soo Polymers Particular polymeric materials often require enhanced mechanics with thermal stability. Our goal is to investigate mechanical and thermal responses for stretchable coextruded fibers and supramolecular elastomers, and phase diagrams of thermally stable liquid crystal (LC) blends. This thesis is organized into three parts. Part I (Chapter 2) investigates the mechanical and thermal properties of drawn, melt-extruded polyolefin fibers. The mechanics, fiber dimensions and specific surface area of fibers were tuned as a function of draw ratio. Part II (Chapter 3) details the enhancement of mechanical and thermal properties of supramolecular elastomers containing both dynamic and covalent crosslinks. Via the precise control of UV exposure, the cure and the degradation of the UV-curable groups within the main elastomeric chains were investigated to achieve optimum mechanical properties, yielding robust supramolecular elastomers. Understanding of this structural interplay exhibits synergistic benefits derived from combination of dynamic and covalent crosslinks and provides new insight into the design and architecture of mechanically-tunable supramolecular elastomers. Part III (Chapters 4 and 5) explores thermally stable LC/polymer blends fabricated using thermally-induced phase separation (TIPS) for applications in extrusion and injection molding. Due to the limited thermal stability of current commercially available LCs, the usage of TIPS has been restricted. To overcome this issue, two different smectic liquid crystal series based on the biphenyl moiety were designed and examined for their thermal stability, liquid crystalline properties, and phase behavior (miscibility, phase separation, and phase diagrams) for polymer-dispersed liquid crystals (PDLCs). The chain length and structural impact on the polymer thermal properties and constructed phase diagrams for PDLC were investigated. 2016-01-27 English text Case Western Reserve University School of Graduate Studies / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=case1448900992 http://rave.ohiolink.edu/etdc/view?acc_num=case1448900992 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center.
collection NDLTD
language English
sources NDLTD
topic Polymers
spellingShingle Polymers
Jang, Keon-Soo
Exploring mechanics via structural interplay in supramolecular networks, melt-extruded fibers, and liquid crystal/polymer blends
author Jang, Keon-Soo
author_facet Jang, Keon-Soo
author_sort Jang, Keon-Soo
title Exploring mechanics via structural interplay in supramolecular networks, melt-extruded fibers, and liquid crystal/polymer blends
title_short Exploring mechanics via structural interplay in supramolecular networks, melt-extruded fibers, and liquid crystal/polymer blends
title_full Exploring mechanics via structural interplay in supramolecular networks, melt-extruded fibers, and liquid crystal/polymer blends
title_fullStr Exploring mechanics via structural interplay in supramolecular networks, melt-extruded fibers, and liquid crystal/polymer blends
title_full_unstemmed Exploring mechanics via structural interplay in supramolecular networks, melt-extruded fibers, and liquid crystal/polymer blends
title_sort exploring mechanics via structural interplay in supramolecular networks, melt-extruded fibers, and liquid crystal/polymer blends
publisher Case Western Reserve University School of Graduate Studies / OhioLINK
publishDate 2016
url http://rave.ohiolink.edu/etdc/view?acc_num=case1448900992
work_keys_str_mv AT jangkeonsoo exploringmechanicsviastructuralinterplayinsupramolecularnetworksmeltextrudedfibersandliquidcrystalpolymerblends
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