Thus, it will be apparent to those skilled in the art that pendant aliphatic moieties on the reactant polythiols and polyhalides necessitates an increase in chain S content to maintain the inventive polythioether atomic ratio and as such are generally disfavored. [0018] Suitable polyhalides illustratively include di- and tri-halides such as 1,2-dichloroethane and 1,2,3-trichloropropane.