Process for producing {TAIL ~ a polyamide} based on a dicarboxylic acid and {HEAD ~ a diamine} 
Process for producing { TAIL ~ a polyamide } based on a dicarboxylic acid and { HEAD ~ a diamine }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD