Compositional analysis of the high molecular weight ethylene oxide propylene oxide copolymer by MALDI mass spectrometry

by Jaber Houshia, Orwa; Wilkins, Charles L.

The compn. of narrow distribution poly ethylene oxide-propylene oxide copolymer (Mw ∼ 8700 Da) was studied using matrix assisted laser desorption ionization (MALDI) mass spectrometry. The ethylene oxide-propylene oxide copolymer produced oligomers sepd. by 14 Da. The av. resolving power over the entire spectrum was 28,000. Approx. 448 isotopically resolved peaks representing about 56 oligomers are identified. Although agreement between exptl. and calcd. isotopic distributions was strong, the compositional assignment was difficult. This is due to the large no. of possible isobaric components. The purpose of this research is to resolve and study the compn. of high mass copolymer such as ethylene oxide-propylene oxide.

Journal
International Journal of Chemistry
Volume
4
Issue
3
Year
2012
Start Page
14
URL
http://www.ccsenet.org/journal/index.php/ijc/article/view/15568
ISBN/ISSN
1916-9701; 1916-9698
DOI
10.5539/ijc.v4n3p14