A MALDI-TOF MS study of oligomeric poly(m-phenyleneisophthalamide).
MALDI-TOF MS was used to study the end-group distribution of a series of poly(m-phenyleneisophthalamide) oligomers which were synthesized using various mole percent ratios of diamine to diacid chloride (90:10, 80:20, 70:30, 60:40, 50:50, 40:60, 30:70, 20:80, and 10:90) to clarify results obtained in previous work published in this journal. Oligomers synthesized with excess diamine or excess diacid chloride were found to contain abundances of amine or carboxylate end groups, respectively, as expected. Oligomers synthesized with equal molar ratios of reactants produced cyclic species which were also found in a previous publication as an oligomer in commercially produced, high molecular mass Nomex.
Gies
Anthony P
AP
Department of Chemistry, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
Nonidez
William K
WK
Ellison
Sparkle T
ST
Ji
Haining
H
Mays
Jimmy W
JW
D000577:Amides / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry; D002712:Chlorides / Q000737:chemistry; D003959:Diamines / Q000737:chemistry; D008970:Molecular Weight; D010795:Phthalic Acids / Q000737:chemistry*; D011108:Polymers / Q000032:analysis / Q000138:chemical synthesis / Q000737:chemistry; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*
D000577:Amides; D002264:Carboxylic Acids; D002712:Chlorides; D003959:Diamines; D010795:Phthalic Acids; D011108:Polymers; C500111:poly(m-phenyleneisophthalamide)