Thermal Degradation of Glutamate Polymers
作者:
C.Peter Lillya,
WilliamJ. Macknight,
RichardM. Newman,
Wei-FangA. Su,
PeterC. Uden,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1980)
卷期:
Volume 14,
issue 8
页码: 1181-1196
ISSN:0022-233X
年代: 1980
DOI:10.1080/00222338008056738
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Thermal properties of precipitated samples and films of poly-γ-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, H2O, 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.
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