distortiontemp u00b0 c annealed 264 psi 1 4 34 222 216unannealed 264 psi 1 4 34 203 210 198melt index 371 u00b0 c 0 5 3 48flexural modulus psiat 25 u00b0 c 472 000 474 000 460 000 93 u00b0 c 380 000 393 000 384 000 176 u00b0 c 319 000 317 000 200 u00b0 c 292 000 307 750 253 000flexural strength psiat 25 u00b0 c 21 700 22 000 21 000 93 u00b0 c 16 350 17 000 16 120 176 u00b0 c 9 590 9 250 200 u00b0 c 6 820 6 957 5 680______________________________________ sup 1 made in mcresol sup 2 made in odichlorobenzene sup 3 made in odichlorobenzene using no pmda with all ingredients being charged to reactor at same time notably the melt index of the control is much higher which is indicative of a polymer of lower molecular weight such a polymer is less desirable than the other two shown 10 pmda and 20 pmda respectively which have lower melt indices and concomitantly higher molecular weights and which will consequently possess better flexural properties after molding as shown a reactor was charged with 964 19 grams of 2 2 bis 4 2 3 dicarboxyphenoxy phenyl propane dianhydride 7 66 grams of phthalic anhydride and 0 22 gram of sodium benzophosphonate and the resulting mixture was agitated for 20 to 30 minutes while 245 21 grams of meta phenylene diamine were added the temperature was raised to 130 u00b0 c with the condensate over the reactor being collected and drained off after the temperature.