Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 9, Pages 6088-6097Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am405138e
Keywords
thiol-ene; thiol-isocyanate; click chemistry; glass transition temperature; dual network
Funding
- Office of Naval Research [N00014-07-1-1057]
- U.S. Dept. of Education GAANN Fellowship Program [P200A090066]
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We report the physical properties of thiol-ene networks modified with thiourethane or urethane linkages, either along the main chain or as a branched component in the network, respectively. Because of the robust and orthogonal nature of thiol-isocyanate and thiol-ene reactions, these networks can be formed in a two-step, one-pot synthesis. Resultant networks were characterized using dynamic mechanical analysis, mechanical testing and other complementary techniques. It was found that incorporating (thio)-urethanes into the networks increased T-g, but also increased strain at break and toughness while decreasing cross-link density. The changes in physical properties are discussed in terms of a proposed dual network morphology. These facile modifications to thiol-ene networks demonstrate how molecular-level, nanoscale changes can have a profound influence on the macroscale properties through hierarchical development of network morphology.
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