C60 and Sc3N@C80(TMB-PPO) derivatives as constituents of singlet oxygen generating, thiol-ene polymer nanocomposites

Emily M. Barker; Ashli R. Toles; Kyle A. Guess; Janice Paige Buchanan

doi:10.3934/matersci.2016.3.965

AIMS Materials Science, 2016, 3(3): 965-988. doi: 10.3934/matersci.2016.3.965. Research article Topical Section

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C₆₀ and Sc₃N@C₈₀(TMB-PPO) derivatives as constituents of singlet oxygen generating, thiol-ene polymer nanocomposites

Emily M. Barker, Ashli R. Toles, Kyle A. Guess, Janice Paige Buchanan

Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive, Hattiesburg, MS 39046, USA

Received: , Accepted: , Published:

Topical Section: Advanced composites

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Numerous functionalization methods have been employed to increase the solubility, and therefore, the processability of fullerenes in composite structures, and of these radical addition reactions continue to be an important methodology. C₆₀ and Sc₃N@C₈₀ derivatives were prepared via radical addition of the photodecomposition products from the commercial photoinitiator TMB-PPO, yielding C₆₀(TMB-PPO)₅ and Sc₃N@C₈₀(TMB-PPO)₃ as preferred soluble derivatives obtained in high yields. Characterization of the mixture of isomers using standard techniques suggests an overall 1PPO:6TMB ratio of addends, reflecting the increased reactivity of the carbon radical. Although, a higher percentage of PPO is observed in the Sc₃N@C₈₀(TMB-PPO)₃ population, perhaps due to reverse electronic requirements of the substrate. Visually dispersed thiol-ene nanocomposites with low extractables were prepared using two monomer compositions (PETMP:TTT and TMPMP:TMPDE) with increasing fullerene derivative loading to probe network structure-property relationships. Thermal stability of the derivatives and the resulting networks decreased with increased functionality and at high fullerene loadings, respectively. TMPMP:TMPDE composite networks show well-dispersed derivatives via TEM imaging, and increasing T_g’s with fullerene loading, as expected for the incorporation of a more rigid network component. PETMP:TTT composites show phase separation in TEM, which is supported by the observed T_g’s. Singlet oxygen generation of the derivatives decreases with increased functionality; however, this is compensated for by the tremendous increase in solubility in organic solvents and miscibility with monomers. Most importantly, singlet oxygen generation from the composites increased with fullerene derivative loading, with good photostability of the networks.

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Keywords: fullerenes; C₆₀; Sc₃N@C₈₀; fullerene derivatives; thiol-ene; nanocomposites

Citation: Emily M. Barker, Ashli R. Toles, Kyle A. Guess, Janice Paige Buchanan. C₆₀ and Sc₃N@C₈₀(TMB-PPO) derivatives as constituents of singlet oxygen generating, thiol-ene polymer nanocomposites. AIMS Materials Science, 2016, 3(3): 965-988. doi: 10.3934/matersci.2016.3.965

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