TY - JOUR
T1 - Toward Taming the Chemical Reversibility of Perfluoropyridine through Molecular Design with Applications to Pre-and Postmodifiable Polymer Architectures
AU - Houck, Matthew B.
AU - Fuhrer, Timothy J.
AU - Phelps, Cole R.
AU - Brown, Loren C.
AU - Iacono, Scott T.
N1 - Funding Information:
The authors acknowledge Dr. Carla Slebodnick of Virginia Tech for her assistance with crystal disorder modeling. M.B.H. and L.C.B. are National Research Council (NRC) Postdoctoral Fellows funded by the Air Force Office of Scientific Research (AFOSR). S.T.I. acknowledges financial support from the Air Force Office of Scientific Research (AFOSR).Contribute work by T.J.F. was accomplished during his tenure as part of the U.S. Air Force Research Lab Summer Faculty Fellowship Program (SFFP) funded by AFOSR.
Publisher Copyright:
© Not subject to U.S. Copyright. Published 2021 by American Chemical Society.
PY - 2021/6/22
Y1 - 2021/6/22
N2 - Polymer functionality greatly determines many of the key properties of these materials, such as glass-Transition temperature, electrical and thermal conductivity, thermal stability, mechanical strength, and processability. Despite the importance of polymer functionality in determining material properties, the synthesis of functional polymers, with well-defined molecular weights and compositions, can still present a significant challenge, with many of the methods related to pre-or postpolymerization modification lacking synthetic scope, or requiring harsh functionalization conditions or transition-metal coupling reactions to install the desired functionality. Perfluoroaromatic systems are promising for the preparation of novel polymer architectures given that they can be readily functionalized using simple nucleophilic chemistries under very mild basic conditions. While promising, these systems have displayed some drawbacks. Previous work has shown that perfluoroaromatics, such as perfluoropyridine, can demonstrate a high degree of chemical reversibility with heteroatom nucleophiles. If the synthetic potential of these systems is to be realized, then a strategy for the rational design of stable monomers must be developed. Herein, we report the design, synthesis, and characterization of a series of unexplored heteroatom-based ring-opening metathesis polymerization (ROMP)-Active monomers containing a reactive perfluoropyridine pendent group, which can be used to readily prepare a wide variety of aryl ether-functionalized polymers, using both pre-and postpolymerization modification strategies. We also establish a direct connection between the dihedral angle of the monomer and its propensity to undergo reversible addition reactions, establishing functional criteria for the design of pre-and postmodifiable systems.
AB - Polymer functionality greatly determines many of the key properties of these materials, such as glass-Transition temperature, electrical and thermal conductivity, thermal stability, mechanical strength, and processability. Despite the importance of polymer functionality in determining material properties, the synthesis of functional polymers, with well-defined molecular weights and compositions, can still present a significant challenge, with many of the methods related to pre-or postpolymerization modification lacking synthetic scope, or requiring harsh functionalization conditions or transition-metal coupling reactions to install the desired functionality. Perfluoroaromatic systems are promising for the preparation of novel polymer architectures given that they can be readily functionalized using simple nucleophilic chemistries under very mild basic conditions. While promising, these systems have displayed some drawbacks. Previous work has shown that perfluoroaromatics, such as perfluoropyridine, can demonstrate a high degree of chemical reversibility with heteroatom nucleophiles. If the synthetic potential of these systems is to be realized, then a strategy for the rational design of stable monomers must be developed. Herein, we report the design, synthesis, and characterization of a series of unexplored heteroatom-based ring-opening metathesis polymerization (ROMP)-Active monomers containing a reactive perfluoropyridine pendent group, which can be used to readily prepare a wide variety of aryl ether-functionalized polymers, using both pre-and postpolymerization modification strategies. We also establish a direct connection between the dihedral angle of the monomer and its propensity to undergo reversible addition reactions, establishing functional criteria for the design of pre-and postmodifiable systems.
UR - http://www.scopus.com/inward/record.url?scp=85108403246&partnerID=8YFLogxK
U2 - 10.1021/acs.macromol.1c00990
DO - 10.1021/acs.macromol.1c00990
M3 - Article
AN - SCOPUS:85108403246
SN - 0024-9297
VL - 54
SP - 5586
EP - 5594
JO - Macromolecules
JF - Macromolecules
IS - 12
ER -