Understanding the impact of lignin-derivable non-isocyanate polyurethane (NIPU) chemistry on electrospinnability and fiber quality
| Author(s) | Mahmood, Maida | |
| Date Accessioned | 2024-02-28T15:05:01Z | |
| Date Available | 2024-02-28T15:05:01Z | |
| Publication Date | 2024 | |
| SWORD Update | 2024-02-26T17:09:53Z | |
| Abstract | Polyurethanes (PUs) are a critical component of the global polymer industry but mainly are derived from fossil fuels and contain hazardous precursors. Non-isocyanate polyurethanes (NIPUs) derived from lignocellulosic biomass, not only provide a safer and sustainable alternative to conventional PUs but also contain functional groups that can alleviate processing challenges and improve electrospinnability. In this work, lignin-derivable bisguaiacol A (BGA)-NIPU (one methoxy group on each aromatic ring with dimethyl bridging substitution) and bisguaiacol F (BGF)-NIPUs (one methoxy group on each aromatic ring without dimethyl bridging substitution) are used to fabricate electrospun fiber mats; and the impact of lignin-derivable NIPU chemistries on electrospinnability and fiber quality is studied. It was found that the presence of methoxy groups in lignin-derivable NIPUs led to a 10-50% increase in viscosity as compared to the bisphenol A (BPA)-NIPU control (no methoxy groups with a dimethyl substitution). Additionally, the absence of dimethyl substitution led to the highest viscosity and completely bead-free fibers in BGF-NIPU in comparison to BPA-NIPU and BGA-NIPU. This work provides an understanding of structure-processing relationships for the electrospinning of lignin-derivable NIPUs. These insights can help inform future studies regarding manufacturing of bio-based NIPU fibers and fiber-composites for different applications. | |
| Advisor | Korley, LaShanda T.J. | |
| Advisor | Epps, Thomas H., III | |
| Degree | M.M.S.E. | |
| Department | University of Delaware, Department of Materials Science and Engineering | |
| Unique Identifier | 1429319981 | |
| URL | https://udspace.udel.edu/handle/19716/34031 | |
| Language | en | |
| Publisher | University of Delaware | |
| URI | https://www.proquest.com/pqdtlocal1006271/dissertations-theses/understanding-impact-lignin-derivable-non/docview/2932337689/sem-2?accountid=10457 | |
| Keywords | Polyurethanes | |
| Keywords | Non-isocyanate polyurethanes | |
| Keywords | Bisphenol A | |
| Keywords | Electrospinnability | |
| Keywords | Fiber quality | |
| Title | Understanding the impact of lignin-derivable non-isocyanate polyurethane (NIPU) chemistry on electrospinnability and fiber quality | |
| Type | Thesis |