Investigation of novel photo-cross-linking reactions for the preparation of functional polymeric materials
department or school: Science, Faculty of
department or school: Chemistry, Department of
data provider: DSpace
degree campus: UBCV
creator: Wright, Taylor Douglas
issued: 2022-02-10T08:00:00Z
issued: 2022
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Investigations of a number of photochemical cross-linking reactions are reported for the preparation of functional polymeric materials. Reactions that require constant inputs of light and do not proceed through radical or ionic mechanisms are studied, and the final properties of these materials are characterized. This work aims to expand the scope of available photo-cross-linking reactions for the preparation of functional materials. The incorporation of photodimerizable anthracene into a thermally healable vinylogous urethane copolymer enables light-induced post-polymerization UV cross-linking. This allows for tuning of the glass transition temperature over a 20 °C range, control over the rheological properties, and tuning the scratch healing temperature. Pendant attachment of anthracene moieties onto a flexible siloxane polymer (PDMS) results in macroscopic polymer crystallization upon photo-cross-linking, giving a heterogeneous material with up to 1 mm diameter crystallites embedded inside a flexible matrix. A thorough investigation of the growth of the polymer crystallites through microscopic and diffusion techniques revealed unique crystallite growth initiating from the bottom of the film and progressing upwards towards the irradiation source. The application of photogenerated singlet oxygen is applied to the cross-linking of amine siloxanes. Oxidative coupling of amine groups to imine groups results in facile cross-linking at room temperature in oxygen rich environments using visible light with no measurable side reactions. Solvent free precursors were prepared by covalent attachment of the sensitizer to the PDMS backbone. As coatings, these materials demonstrate contact antimicrobial activity against bacterial cells, being more effective against E. Coli than methicillin-resistant Staphylococcus aureus (MRSA), as well as inducing cell lysis in mammalian cells. This system was further developed as a dual-functional textile coating, utilizing both contact antimi…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/80823
note: INVESTIGATION OF NOVEL PHOTO-CROSS-LINKING REACTIONS FOR THE PREPARATION OF FUNCTIONAL POLYMERIC MATERIALS by Taylor Douglas Wright B.Sc., The University of British Columbia, 2017 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Chemistry) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) February 2022 © Taylor Douglas Wright, 2022 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the dissertation entitled: INVESTIGATION OF NOVEL PHOTO-CROSS-LINKING REACTIONS FOR THE PREPARATION OF FUNCTIONAL POLYMERIC MATERIALS submitted by Taylor Douglas Wright in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Chemistry Examining Committee: Dr. Michael Wolf, Professor, Chemistry, UBC Supervisor Dr. Carl Michal, Associate Professor, Physics & Astronomy, UBC Supervisory Committee Member Dr. Parisa Mehrkhodavandi, Professor, Chemistry, UBC University Examiner Dr. Orlando Rojas, Professor, Chemical and Biological Engineering, UBC University Examiner Additional Supervisory Committee Members: Dr. Jennifer Love, Professor, Chemistry, University of Calgary Supervisory Committee Member Dr. Mark MacLachlan, Professor, Chemistry, UBC Supervisory Committee Member iii Abstract Investigations of a number of photochemical cross-linking reactions are reported for the preparation of functional polymeric materials. Reactions that require constant inputs of light and do not proceed through radical or ionic mechanisms are studied, and the final properties of these materials are characterized. This work aims to expand the scope of available photo-cross-linking reactions for the preparation of functional materials. The incorporation of photodimerizable anthracene into a thermally healable vinylogous urethane copolymer enables light-induced post-polymerization UV cross-linking. Th…
has type: Thesis/Dissertation
date issued: 2022-05
is shown at: 10.14288/1.0406557
language: eng
degree discipline: Chemistry
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Wolf, Michael O.
type: Text
identifier URI: http://hdl.handle.net/2429/80823