cyanate ester shape memory polymers . the polymers are preferably formed via reaction of a multifunctional cyanate ester and a mono functional cyanate ester and exist , in one inventive aspect , in the form of a cross - linked thermoset network . optional catalysts and structural modifiers may be added to the reaction moieties to help control the glass transition temperature of the resulting smp to greater than 0 ° c ., preferably from about 150 ° c .- 300 ° c .