Determination of the extent of acid hydrolysis of N-methylpyrrolidone

Twenty-two different graphite grades of the families natural, synthetic, intercalated, expanded, amorphous, and turbostratic graphite, as well as platelets and activated carbon, were analyzed on their dispersibility in N-methylpyrrolidone, cyclohexylpyrrolidone and water-sodium cholate solution. They were characterized for their properties (grain size, density, purity, surface area, pH in water) and morphology. Thermogravimetric analysis, Raman spectroscopy studies, and electrical conductivity measurements were also used. XRPD followed by a Rietveld refinement provided information on the amounts of the rhombohedral (3R) and hexagonal (2H) phases for the crystalline part of the material and the interlayer distances. The properties of graphites favoring better dispersibility are: small grain size and bulk density, neutral pH in water. The electrical conductivity in inversely proportional to the Raman D-band intensity and is highest for the graphites with shortest interlayer spacing. The D-, G-and 2D-bands in the Raman spectra of graphites are in an exponential relation.

show abstract

“…This can be crucial for organic solvents since, for example, NMP is known to undergo acidic hydrolysis yielding γ -methylaminobutyric acid (12).…”

Section: Resultsmentioning

confidence: 99%

Effect of the Structure and Morphology of Natural, Synthetic and Post-processed Graphites on Their Dispersibility and Electronic Properties

Kozhemyakina

Eigler

Dinnebiér

et al. 2013

Fullerenes, Nanotubes and Carbon Nanostructures

View full text Add to dashboard Cite

show abstract

“…The HC1 salt of NMP also decomposed quantitatively in the injection port to give free NMP. NMP hydrochloride and 7-methylaminobutyric acid hydrochloride were determined in the crude NMP mixture by potentiometric titration (Trusell, 1966).…”

Section: Ch3-chmentioning

confidence: 99%