Polythiourethane elastomers prepared from thiol-isocyanate-acrylate reactions
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Sulfur-containing polymers have been paid growing attentions due to their unique physical, optical, and mechanical properties. Multifunctional thiols are materials for the design of sulfur containing polymers due to effective reactivity of the thiol toward isocynates, acrylates, enes or epoxy groups. In this study, elastomeric polythiourethanes were synthesized by reaction of 2,2′-(ethylenedioxy)diethanethiol(EDDT) with various multifunctional isocyanates such as hexamethylene diisocynate(HDI), trimethylhexa-methylene diisocyanate(TMHDI), and poly(hexamethylene diisocyanate)(PHDI) as well as N,N’-methylene bis(acrylamide)(MBAAm) bearing two polar amide groups in the presence of base catalyst. Crosslinked polythiourethane network was formed by reacting EDDT with a multifunctional isocyanate. Hydrogen bonding interactions were introduced through the addition of thiol-acrylates and MBAAm. The effects of thiol to isocyanate ratio and MBAAm content on elastomer properties were investigated.