Thermomechanical Formation–Structure–Property Relationships in Photopolymerized Copper-Catalyzed Azide–Alkyne (CuAAC) Networks
作者:Austin Baranek、Han Byul Song、Mathew McBride、Patricia Finnegan、Christopher N. Bowman
DOI:10.1021/acs.macromol.6b00137
日期:2016.2.23
Bulk photopolymerization of a library of synthesized multifunctional azides and alkynes was carried out toward developing structure property relationships for CuAAC-based polymer networks. Multifunctional azides and alkynes were formulated with a copper catalyst and a photoinitiator, cured, and analyzed for their mechanical properties. Material properties such as the glass transition temperatures (T-g) show a strong dependence on monomer structure with T-g values ranging from 41 to 90 degrees C for the series of CuAAC monomers synthesized in this study. Compared to the triazoles, analogous thioether-based polymer networks exhibit a 45-49 degrees C lower T-g whereas analogous monomers composed of ethers in place of carbamates exhibit a 40 degrees C lower T-g. Here, the formation of the triazole moiety during the polymerization represents a critical component in dictating the material properties of the ultimate polymer network where material properties such as the rubbery modulus, cross-link density, and T-g all exhibit strong dependence on polymerization conversion, monomer composition, and structure postgelation.
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