Compositional Analysis of Cationic Polyacrylamide Resins by Reactive Pyrolysis-Gas Chromatography in the Presence of Organic Alkali

Abstract

Reactive pyrolysis-gas chromatography (Py-GC) in the presence of tetramethylammonium hydroxide (TMAH) was successfully applied to the compositional analysis of cationic polyacrylamide (PAAm) resins, prepared from acrylamide (AAm) and dimethylaminoethylmethacrylate (DM). The reactive pyrolysis of cationic PAAm resulted only in hydrolysis of ester linkages in DM units and did not lead to subsequent methylation of hydrolyzates and cyclization. The intense peak of 2-(dimethylamino)ethanol formed from DM units through the reactive pyrolysis was used as the key peak for the determination of DM content. The content of DM units in the cationic PAAm samples was determined with a precision of about 4% of relative standard deviations.

Determination of the Degree of Acetylation of Chitin/Chitosan by Pyrolysis-Gas Chromatography in the Presence of Oxalic Acid

“…Reactive Py-GC Conditions. Basically the same measuring system for reactive Py-GC described in our previous papers [30][31][32][33][34][35] was used in this system. A vertical microfurnace pyrolyzer (Frontier Lab, PY-2010D) was attached to a gas chromatograph (Shimadzu GC-17A) equipped with a flame ionization detector (FID).…”

“…Here, reactive Py-GC in the presence of some specific reagents might provide a key to solve this problem. It has been shown that reactive Py-GC of condensation polymers in the presence of an organic alkali such as tetramethylammonium hydroxide (TMAH) results in a simplified pyrogram which consists of characteristic peaks of methyl derivatives reflecting the components of the original polymers. , This technique has successfully been applied to structural characterization of various synthetic polymers, − rosin sizing agent in paper, and lipids in zooplanktons . Another reactive pyrolysis in the presence of inorganic solid acids such as cobalt sulfate has been successfully applied to the sequential analyses of copolymer polyacetals .…”