ine ▁extend ers ▁– ▁the ▁am ine - is oc yan ate ▁nucle oph il ic ▁addition ▁reaction ▁does ▁not ▁require ▁catal yst s . ▁Poly ure as ▁also ▁form ▁when ▁is oc yan ate ▁res ins ▁come ▁into ▁contact ▁with ▁mo ist ure ; ▁ ▁Ph en ol ic , ▁am ino ▁and ▁fur an ▁res ins ▁all ▁c ured ▁by ▁poly cond ens ation ▁involving ▁the ▁release ▁of ▁water ▁and ▁heat , ▁with ▁c ure ▁init iation ▁and ▁polym er isation ▁ex oth erm ▁control ▁influenced ▁by ▁cur ing ▁temperature , ▁catal yst ▁selection ▁or ▁loading ▁and ▁processing ▁method ▁or ▁pressure ▁– ▁the ▁degree ▁of ▁pre - pol ym er isation ▁and ▁level ▁of ▁resid ual ▁hydro x ym eth yl ▁content ▁in ▁the ▁res ins ▁determine ▁the ▁cross link ▁density . ▁ ▁Ben z ox az ines ▁are ▁c ured ▁by ▁an ▁ex oth erm al ▁ring - open ing ▁polym er isation ▁without ▁re le asing ▁any ▁chemical , ▁which ▁transl ates ▁in ▁near ▁zero ▁shr ink age ▁upon ▁polym er isation . ▁▁ ▁Th erm os et ting ▁polym er ▁mi xt ures ▁based ▁on ▁therm os et ting ▁res in ▁mon om ers ▁and ▁pre - pol ym ers ▁can ▁be ▁form ulated ▁and ▁applied ▁and ▁processed ▁in ▁a ▁variety ▁of ▁ways ▁to ▁create ▁distinct ive ▁c ured ▁properties ▁that ▁cannot ▁be ▁achieved ▁with ▁therm op last ic ▁polym ers ▁or ▁in organ ic ▁materials . ▁Application / process ▁uses ▁and ▁methods ▁for ▁therm os ets ▁include