Synthesis of Inverse Vulcanized Polymers Containing Urethane and Ester Bonds
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Inverse vulcanization provides a simple, solvent-free method for the preparation of sulfur polymers from elemental sulfur, a byproduct of petroleum refining processes. Despite the successful demonstration of polymers from inverse vulcanization in optical, electrochemical, and self-healing applications, the mechanical properties have remained limited. In this study, we synthesized new inverse vulcanized polymers containing urethane bonds from the polymerization of sulfur, allyl glycidyl ether and various diisocyanates. The glass transition temperature of the copolymer in which only allyl glycidyl ether was reacted without diisocyanate was around 49 ℃, whereas the glass transition temperature of the copolymer in which both diisocyanate and allyl glycidyl ether were reacted increased to a maximum of 87 ℃. In addition, further improved results were obtained in mechanical properties tests, demonstrating the potential for the use of inverse vulcanization polymers as structural materials.