Functional Polymer Materials: From Iptycenes to Ring-Opening Polymerizations
Name
Wu-ymw-PhD-chemistry-2021-thesis.pdf
Description
Thesis PDF
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78.64 MB
Format
Adobe PDF
Checksum (MD5)
b8dbd243d68cdbdf1214395b6df4684f
Author(s)
Wu, You-Chi
Advisor(s)
Swager, Timothy M.
Date Issued
June 2021
Publisher
Massachusetts Institute of Technology
Abstract
In Chapter 1, we incorporate functional groups in triptycene-containing poly aryl ethers to serve a variety of applications. Amine-functionalized polymers are used in graphene oxide composite membranes towards aqueous filtration. Guanidinium-functionalized polymers are explored for impedance-based gas sensing. Pyrazolium-functionalized polymers are fabricated into anion-exchange membranes.
In Chapter 2, we design a set of two- and three-component polyurethanes to elucidate the influence of molecular composition on thermal transition characteristics, crystallinity, segmental dynamics of PTMO, as well as high-strain-rate impact response.
In Chapter 3, we describe the living cationic ring-opening polymerization of a 2-alkylthio-2-oxazoline as a general platform for postpolymerization modification. Mild substitution conditions provide broad functional group tolerance, constituting a versatile postpolymerization modification platform with access to a diversity of polyureas and polythiocarbamates.
In Chapter 4, we seek to synthesize a dibenzobarrelene-elaborated polyacetylene, whereby the dibenzobarrelene groups can provide stability by steric shielding, as well as a site for attaching solubilizing and functional groups. Routes based on dehydrogenation, bromination–elimination, sulfoxide elimination, and reductive defluorination are discussed.
In Chapter 5, we study a family of bottlebrush polymers that consist of a flexible backbone with rigid, porogenic side chains. Tuning of side-chain length and dispersity, as well as incorporation of new functional groups, are performed to elucidate structure–property relationships and to enable improvements in selectivity.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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