Monomers containing biphenyl moieties were employed to create two sets of covalently crosslinked polymers that displayed noncovalent interactions in their 3-dimensional network. The biphenyls (precursors) used were 2-phenylphenol, 4-phenylphenol and 4,4′-dihydroxybiphenyl, and their acrylated forms were synthesized and named as 2-phenylphenolmonoacrylate, 4-phenylphenolmonoacrylate, and 4,4′-dihydroxybiphenyldiacrylate, respectively. These were characterized by differential scanning calorimetry, nuclear magnetic resonance, and Fourier transform infrared spectroscopy to confirm the successful acrylation reaction. Polymers were synthesized via free radical polymerization reactions with varying crosslinker contents, and their network properties were characterized using swelling studies and compressive modulus tests. Interestingly, swelling studies did not show the expected decreasing swelling ratio with increasing crosslinker content, while compression testing indicated the expected trend of increasing modulus with increasing crosslinking density. The unexpected swelling results are hypothesized to result from the intramolecular interactions between the biphenyl side groups that result in noncovalent crosslinks.
|Journal||Journal of Applied Polymer Science|
|State||Published - Apr 20 2021|
Bibliographical noteFunding Information:
The project described was supported by research grant from National Institute of Environmental Health Sciences (NIEHS) (Project No: P42ES007380). The Authors would like to acknowledge University of Kentucky's Chemistry department for letting us use the NMR facilities.
© 2020 Wiley Periodicals LLC.
- crosslinked polymer
- mechanical testing
- pi-pi interactions
ASJC Scopus subject areas
- Chemistry (all)
- Surfaces, Coatings and Films
- Polymers and Plastics
- Materials Chemistry