28 n 0 42 c 61 30 h 8 26 n 0 41 t m 207 u00b0 determined by differential scanning calorimetry on reheating a sample of the terminal amine containing polypivalolactone prepared in part b above was molded into a thin disc at 180 u00b0 and 3000 psi the disc was ejected from the mold at 100 u00b0 using a 76 2 mm two roll roller mill preheated to 225 u00b0 24 g of the terminal amine containing polypivalolactone prepared in part b was first melted amber color and then rolled for 13 minutes with 41 g of an ethylene methyl acrylate half ethyl ester of maleic acid 41 5 54 4 5 terpolymer initially vapors were observed but they soon ceased sixty grams of amber rubbery graft copolymer were obtained a film of the graft copolymer was pressed between kapton u00ae polyimide film du pont co at 215 u00b0 14 06 kg cm 2 the film when stretched at 5 80 cm min gave 360 percent elongation at the break 175 percent permanent set with a tensile strength of 133 6 kg cm 2 a sample which was stretched after cold drawing three times to 160 percent had 15 percent permanent set a fiber spun at 204 u00b0 had a denier of 209 an.