shifted to u2212 2 51 u00b0 c in the next heating cycle and no deblocking peaks u02dc 135 u00b0 c were evident however this does not signify the complete deblocking of the blocked diisocyanates for instance the dsc profile of the thermally treated bl3175a fig1 c does not have a deblocking thermal peak in the heating cycle following isothermal treatment at 160 u00b0 c for 40 minutes but its ir spectrum shows the presence of residual blocked diisocyanates two distinct t g s are discernible in the dsc profile of nanocapsule m 7 the first t g of u02dc u2212 5 u00b0 c is attributed to the bnco and the second t g of u02dc 105 u00b0 c is attributed to the presence of partially crosslinked polystyrene the distinct and separate t g s confirm different phases in the nanocapsules the effects of time and temperature on deblocking bl3175a were also noticed in the dsc thermograms of nanocapsules containing varying amounts of bnco nanocapsules containing gt 20 bnco exhibited exothermic responses after the second heating cycle while nanocapsules containing lt 20 bnco did not show similar responses additionally higher degrees of crosslinking in the shell dvb increased from 2 wt to 6 wt also resulted in increased deblocking times higher crosslinking of the shell promotes the u201c shield effect u201d dsc analysis was conducted with open samples no lid and closed samples pan capped with a small hole in the center the thermal behaviors of both processes were similar except for the lack of exothermic responses in the open samples this example discusses the synthesis of novel nanocapsules containing active isocyanates within hydroxyl or amine functionalized nanocapsule shells synthesized via.