Date of Last Revision
2023-05-03 12:50:10
Major
Chemical Engineering - Cooperative Education
Degree Name
Bachelor of Science
Date of Expected Graduation
Spring 2019
Abstract
It was hypothesized that through the use of Hofmeister Ions, the lower critical solution temperature (LCST) of poly(vinyl methyl ether) (PVME) and poly(ethylene glycol)- poly(N-isopropylacrylamide) (PEG-b-pNIPAAm) block-copolymer could be controlled. Through literature searches and small lab experiments, our team found that there may be a connection between Hofmeister effects and phase transition of a thermo-responsive polymer. To try and prove this, the lab team decided to take four cations (Mg2+,Na+, Cs+, K+) in solution with the thermo-responsive polymers and compared their LCST to solutions of the thermo-responsive polymer in de-ionized (DI) water. From this study, it was found that the addition of ions in solution lowered the LCST of PVME from 32°C to 26°C-30°C (depending on the ion added) and the LCST of PEG-pNIPAAm from 31°C to 26°C -29°C (depending on the ion added). The implications of this study could aid in efforts to manufacture better drug delivery devices, cell scaffolds, and tissue growth mediums. With increased control on the temperature at which a polymer undergoes a phase transition, the more effective these products can be in practice. The work will be continued by the next group of students.
Research Sponsor
Bi-min Newby Zhang
First Reader
Jie Zheng
Second Reader
Edward Evans
Recommended Citation
Moser, Joshua, "Effects of Hofmeister Ions on Transition Temperature of Two Thermo-Responsive Polymers" (2019). Williams Honors College, Honors Research Projects. 919.
https://ideaexchange.uakron.edu/honors_research_projects/919
Included in
Biochemical and Biomolecular Engineering Commons, Other Chemical Engineering Commons, Thermodynamics Commons