Mechanophore-Linked Polymers for Studying Mechanochemical Response
Potisek, Stephanie
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Permalink
https://hdl.handle.net/2142/84318
Description
Title
Mechanophore-Linked Polymers for Studying Mechanochemical Response
Author(s)
Potisek, Stephanie
Issue Date
2008
Doctoral Committee Chair(s)
Moore, Jeffrey S.
Department of Study
Chemistry
Discipline
Chemistry
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Chemistry, Polymer
Language
eng
Abstract
An initial proof-of-concept experiment demonstrated that a mechanophore-linked polymer could be activated site-specifically via ultrasound-induced mechanical forces. Building on this idea, a method was established to synthesize mechanophore-linked poly(methyl acrylate) in an efficient manner using single electron transfer living radical polymerization (SET-LRP). The utility of this method was demonstrated with a spiropyran (SP) mechanophore that was found to undergo a mechanically induced 6pi-relectrocyclic ring opening. The mechanokinetics of the SP ring opening were probed and the reaction rate was found to increase linearly with increasing molecular weight. The analysis used for these studies will hopefully pave the way for future studies on the effect of molecular architecture on mechanochemical reactivity. Finally, we were able to realize a self-assessing mechanochromic material that directly couples mechanical energy to structural response, by incorporating a SP mechanophore into elastomeric and glassy materials.
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