Method of determining the molecular weight distribution of carbo

Details Method of determining the molecular weight distribution of carbo Method of determining the molecular weight distribution of carbo

1994-08-31

1996-05-28

Warden, Jill

Chemistry: analytical and immunological testing

Including chromatography

210656, 436 94, 436128, 436129, 536 98, G01N 3002

Patent

active

055211003

ABSTRACT:
The molecular weight distribution of carboxymethylcellulose or its salt is determined by gel permeation chromatography using a metal-amine complex and/or a metal-alkali complex as the mobile phase solvent. The column geometry (inside diameter/length) and flow rate for this determination are 1:40-100 and 0.2-0.5 ml/min., respectively. According to this method, the GPC determination of molecular weight distribution can be performed under the same conditions for both starting pulp and CMC.

REFERENCES:
patent: 5366755 (1994-11-01), Timonen et al.
Proceedings 5th International Dissolving Pulps Conference, 1980, TAPPI, Atlanta US, pp. 224-228, Agg, G., et al. "The determination of cellulose molecular weight distribution by gel permeation chromatography and its application in pulp and viscose production".
Chemical Abstracts, CA 70:39031. Eriksson et al., "Gel filtration chromatography of hemicelluloses and carboxymethyl cellulose in cadoxen solution," Svensk Papperstidn. 71(19) pp. 695-698 (1968).
Chemical Abstracts, CA 76:61129. Geczy et al., "Determination of the molecular weight distribution of cellulose and carboxymethyl cellulose by turbidimetric titration in cadoxen (cadmium ethylenediamine) solution", Kolor. Ert. 13(9-10) pp. 209-221 (1971).

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