Nov 06 2019 02:00 PM
Oct 06 2019 03:00 PM
Ph.D. Dissertation Defense
High-Performance Membranes for Solvent Resistant Ultra and Nanofiltration
Bruno Pulido Ponce de León
Supervised by Prof. Susana Nunes
Wednesday, November 06, 2019
02:00 PM - 03:00 PM
Building 3 - Level 5 - Room 5209
The expansion of membrane technology in emerging applications drives a constant demand for novel materials. In this work, it is presented and discussed the preparation of stable porous polymeric membranes for liquid separations in organic solvents that can operate in high temperature and/or acid or basic conditions. Polymeric membranes with the aforementioned properties could replace traditional and energy-intensive separation processes like thermal distillation. In particular, poly(oxindole) derivatives constitute a versatile new family of polymers, and they have been used to engineer porous flat-sheet membranes by non-solvent induced phase separation (NIPS). The prepared membranes were crosslinked using different strategies: (1) chemical crosslinking reacting with dibromides, (2) thermal crosslinking by the incorporation of propargyl as a side group, followed by immersion in hot glycerol, and (3) photo-induced crosslinking via thiol-yne click chemistry and (4) oxidative thermal oxidation. These membranes are used in organic solvents such as dimethyl sulfoxide (DMSO), N-methyl pyrrolidone (NMP), N,N-dimethylformamide (DMF) and others. The molecular weight cut-off of these membranes ranges from 1 kg mol-1to 20 kg mol-1and can be tuned by the casting conditions, with solvent permeance up to 68 L m-2h-1bar-1at 120 ˚C. The reported membranes show exceptional stability in common organic solvents, with minimum swelling and high degradation temperature, allowing them to be employed in organic solvent filtration and separation processes.
Bruno Pulido did his undergrad in Chemistry in 2012 and obtained his master's degree in Chemical Sciences in 2014 at UNAM-México. During this time, he worked at the Material Research Institute IIM-UNAM with a special focus on the synthesis and characterization of novel polycondensation polymers. He also worked as a teacher for undergraduate students at the UNAM - College of Chemistry and was part of the founding faculty team for the Forensic Science bachelor's degree program at the UNAM - Medical School. Bruno started his Ph.D. in 2015 in the Environmental Science and Engineering (EnSE) program under the supervision of Prof. Suzana Nunes. His main research interest has been the development of polymeric membranes for emerging chemical separations applications.