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P. Czub, J. Pielichowski



Studies on the reactions of epoxy resins with carbon disulfide


Polimery 1998, No 11-12, 713


DOI: dx.doi.org/10.14314/polimery.1998.713


Summary

A study was made on the modification of low-molecular-weight epoxy resins with carbon disulfide in various reaction systems. A simple procedure was developed involving an aqueous 50% NaOH/methylene chloride system. New derivatives were prepared with sulfur atoms incorporated into the epoxide ring, di-1,3-oxothiolano-2-thione (compound V in eqn. 1). The resulting S-containing analogs were characterized by GPC, GC/MS, 1H-NMR , FT-IR, elemental analysis and their behavior was examined in the curing and thermal degradation reactions.The more stable five-membered ring free of the stresses inherent to the three-membered epoxide ring, resulted in the lower reactivity of the sulfur derivatives (Table 2). They are also characterized by an inferior thermal resistivity after having been cred with hexahydrophthalic anhydride or with amines (Table 3).


Keywords: modification of epoxy resins with sulfur, carbon disulfide, bis-1,3-oxothiolano-2-thione, curing, thermal resistance


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