Journal
ACS MACRO LETTERS
Volume 3, Issue 12, Pages 1258-1261Publisher
AMER CHEMICAL SOC
DOI: 10.1021/mz500678m
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Funding
- NSF [CHE-1305773]
- WCU Program through the NRF of Korea - Ministry of Education, Science and Technology [R31-10013]
- Department of Materials Science and Engineering
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1305773] Funding Source: National Science Foundation
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The synthesis of dynamic covalent polymers with controllable amounts of sulfur sulfur (S-S) bonds in the polymer backbone via inverse vulcanization of elemental sulfur (S-8) and 1,3-diisopropenylbenzene (DIB) is reported. An attractive feature of the inverse vulcanization process is the ability to control the number and dynamic nature of S-S bonds in poly(sulfur-random-(1,3-diisopropenylbenzene)) (poly(S-r-DIB) copolymers by simple variation of S-8/1201B feed ratios in the copolymerization. S-S bonds in poly(S-r-DIB) copolymers of high sulfur content and sulfur rank were found to be more dynamic upon exposure to either heat, or mechanical stimuli. Interrogation of dynamic S-S bonds was conducted in the solid-state utilizing electron paramagnetic resonance spectroscopy and in situ rheological measurements. Time-dependent theological property behavior demonstrated a compositional dependence of the healing behavior in the copolymers, with the highest sulfur (80 wt % sulfur) content affording the most rapid dynamic response and recovery of theological properties.
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