Mechanistic Studies of Controlled Cationic Polymerizations of Vinyl Ethers
Gespeichert in:
| Veröffentlicht in: | ProQuest Dissertations and Theses (2025) |
|---|---|
| 1. Verfasser: | |
| Veröffentlicht: |
ProQuest Dissertations & Theses
|
| Schlagworte: | |
| Online-Zugang: | Citation/Abstract Full Text - PDF |
| Tags: |
Keine Tags, Fügen Sie das erste Tag hinzu!
|
MARC
| LEADER | 00000nab a2200000uu 4500 | ||
|---|---|---|---|
| 001 | 3257330974 | ||
| 003 | UK-CbPIL | ||
| 020 | |a 9798297601215 | ||
| 035 | |a 3257330974 | ||
| 045 | 2 | |b d20250101 |b d20251231 | |
| 084 | |a 66569 |2 nlm | ||
| 100 | 1 | |a Perkins, Nikkolette A. | |
| 245 | 1 | |a Mechanistic Studies of Controlled Cationic Polymerizations of Vinyl Ethers | |
| 260 | |b ProQuest Dissertations & Theses |c 2025 | ||
| 513 | |a Dissertation/Thesis | ||
| 520 | 3 | |a Controlled cationic polymerizations are chain-growth processes involving electron-rich vinyl monomers that utilize an equilibrium between dormant and active states to enable precise control over molecular weight and minimize chain transfer and termination events. This mechanistic assumption implies that molecular weight dispersity (Đ) directly correlates with the concentration of the dormant adduct, but preliminary experimental data from the Chiu group challenges this assumption. This observation suggests a more complex reaction mechanism and highlights the need for systematic studies. This work aims to determine reaction orders for all components in two controlled cationic polymerization initiator-activator systems utilizing variable time normalization analysis (VTNA) with isobutyl vinyl ether (IBVE) as the monomer. Two systems were studied: one using an IBVE-HCl adduct as an initiator, with ethyl acetate and diethyl ether as dual bases, and ZnCl2 as the activator, while the other system utilized an IBVE-thiophene-carboxylate adduct as an initiator, diethyl ether as a base, and ZnCl2 as the activator. The reaction orders identified through VTNA disagree with the previously assumed mechanism and suggest there are multiple equilibria between dormant multiple dormant state, which supports the previous observation that there is a more complex mechanism. Both sets of results provide valuable insights into the field of controlled cationic polymerizations to further understand the reaction mechanism. | |
| 653 | |a Organic chemistry | ||
| 653 | |a Polymer chemistry | ||
| 653 | |a Chemistry | ||
| 773 | 0 | |t ProQuest Dissertations and Theses |g (2025) | |
| 786 | 0 | |d ProQuest |t ProQuest Dissertations & Theses Global | |
| 856 | 4 | 1 | |3 Citation/Abstract |u https://www.proquest.com/docview/3257330974/abstract/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text - PDF |u https://www.proquest.com/docview/3257330974/fulltextPDF/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |