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Ph.D. in Chemistry Dissertation Defense: Yunchuan Qi 12/16

12/01/2022
By Kwok Fan Chow

The Kennedy College of Science, Department of Chemistry, invites you to attend a dissertation defense by Yunchuan Qi entitled “Dynamic Polymerization and Macrocyclization Systems.” The defense will be held in Olney 503 (North campus) on Friday, Dec. 16 at 1 p.m.

Committee Chair: Prof. Olof Ramstrom, Department of Chemistry, University of Massachusetts Lowell

Committee Members:

  • Prof. Mingdi Yan, Department of Chemistry, University of Massachusetts Lowell
  • Prof. Marina Ruths, Department of Chemistry, University of Massachusetts Lowell
  • Prof. Lawrence Wolf, Department of Chemistry, University of Massachusetts Lowell

Abstract:
Nitroalcohol dynamic covalent polymers (dynamers) and macrocycles have been synthesized through the nitroaldol (Henry) reaction. Linear nitroalcohol dynamers, built by bitopic monomers, can be depolymerized by monofunctional reagents as external stimuli and can generate macrocycles as a result of thermodynamic control. This dynamer-macrocycle transformation has been observed in several nitroaldol systems and 14 tetra-β-nitroalcohol macrocycles (lowellanes) have been identified. Moreover, crosslinked nitroalcohol dynamer organogels, constructed by tritopic and bitopic building blocks in organic solvents, have demonstrated excellent self-healing, regenerating and recycling abilities thanks to the high dynamicity of the nitroaldol reaction.

All interested students and faculty members are invited to attend.