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UBC Theses and Dissertations
Indium catalysts supported by pincer ligands as initiators for lactide polymerization Habibzadehbizhani, Afagh
Abstract
Biodegradable polylactide is synthesized via the ring opening polymerization of lactide. The common initiators for the ring opening polymerization of lactide are metal alkoxide and amide metal complexes bearing an ancillary ligand. In this thesis we explored the use a pincer ligand for the synthesis of indium alkyl catalysts for the polymerization of lactide. The NCN pincer ligand has a rigid aryl backbone with an anionic donor carbon and two neutral two electron donor nitrogen. Investigation of the structure-function relationship in polymerization reactions showed enhanced activity and selectivity for complexes bearing NCN ligands with amine rather than imine donors. Chain-end analysis of the low molecular weights fractions of PLA show no indication of alkyl chain-ends suggesting that at least in lower molecular weights of PLA, different mechanism rather than normal alkyl insertion-coordination is taking place.
Item Metadata
| Title |
Indium catalysts supported by pincer ligands as initiators for lactide polymerization
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| Creator | |
| Supervisor | |
| Publisher |
University of British Columbia
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| Date Issued |
2023
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| Description |
Biodegradable polylactide is synthesized via the ring opening polymerization of lactide. The common initiators for the ring opening polymerization of lactide are metal alkoxide and amide metal complexes bearing an ancillary ligand. In this thesis we explored the use a pincer ligand for the synthesis of indium alkyl catalysts for the polymerization of lactide. The NCN pincer ligand has a rigid aryl backbone with an anionic donor carbon and two neutral two electron donor nitrogen. Investigation of the structure-function relationship in polymerization reactions showed enhanced activity and selectivity for complexes bearing NCN ligands with amine rather than imine donors. Chain-end analysis of the low molecular weights fractions of PLA show no indication of alkyl chain-ends suggesting that at least in lower molecular weights of PLA, different mechanism rather than normal alkyl insertion-coordination is taking place.
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| Genre | |
| Type | |
| Language |
eng
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| Date Available |
2025-05-31
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| Provider |
Vancouver : University of British Columbia Library
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| Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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| DOI |
10.14288/1.0432649
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| URI | |
| Degree | |
| Program | |
| Affiliation | |
| Degree Grantor |
University of British Columbia
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| Graduation Date |
2023-11
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| Campus | |
| Scholarly Level |
Graduate
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| Rights URI | |
| Aggregated Source Repository |
DSpace
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Rights
Attribution-NonCommercial-NoDerivatives 4.0 International