Thermal Degradation of Glutamate Polymers
Journal
Journal of Macromolecular Science: Part A - Chemistry
Journal Volume
14
Journal Issue
8
Pages
1181-1196
Date Issued
1980
Author(s)
Abstract
Thermal properties of precipitated samples and films of poly-y-benzyl-L-glutamate (PBG) and poly-L-glutamic acid (PGA) have been studied using TGA, DSC, and pyrolysis. The PBG film was identified as that described by McKinnon and Tobolsky as “form C” (“film A” of Uematsu et al.) using IR, dielectric relaxation, and DSC data. The PGA film is α-helical (IR) and was further characterized by dielectric relaxation measurements. With the exception of water loss at ~110 from PGA, TGA and DSC measurements reveal only incomplete endotherms corresponding to decomposition. Volatile decomposition products were trapped and identified using combined GC/IR and GC/MS techniques. Identified products were as follows: from PGB-CO2, NH3, H20, toluene, benzaldehyde, benzyl alcohol, and benzoic acid; from PGA-CO2, NH3, CH3OH, acetone, and H2O. Only minor differences were noted in GC traces of the total volatile decomposition products in air or in nitrogen streams. No evidence for retained solvent in cast films was obtained. © 1980, Taylor & Francis Group, LLC. All rights reserved.
SDGs
Type
journal article