MALDI-TOF/TOF CID study of poly(1,4-dihydroxybenzene terephthalate) fragmentation reactions

POLYMER

卷:64

Article

Gies, Anthony P.¹  Stow, Sarah M.¹  McLean, John A.¹  Hercules, David M.¹ 

[1] Vanderbilt Univ, Dept Chem, Nashville, TN 37135 USA

关键词: MALDI;    Aromatic polyesters;    Collision-induced dissociation;   

DOI  :  10.1016/j.polymer.2015.03.021

来源: Elsevier

【 摘 要 】

MALDI-TOF/TOF collision-induced dissociation (CID) experiments were conducted on model aromatic polyester oligomers. CID fragmentation studies identified initial fracture of the ester bond and subsequent CO loss as a major pathway, consistent with the general fragmentation mechanism used to explain the origin of poly(p-phenylenediamine terephthalamide) (PPD-T) fragment ions. Specifically, both charge-remote and charge-site fragmentation were observed. Different parent-ion species were observed, the major ones being carboxyl-hydroxyl, di-carboxyl, di-hydroxyl, and phenyl-carboxyl terminated. One species observed was hydroxyl-diethylamine terminated caused by reaction of carboxyl groups with triethylamine added to the synthesis reaction mixture. Fragment ions reflected the end groups of the parent oligomers. Some MALDI fragment-ion spectra were obtained for species showing exchange between Li and H at the carboxyl end group. Bond energy calculations provide further insight into suggested fragmentation mechanisms. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

Free