ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7

Published monthly
 

The evaluation of cellulose by 'U' value

V. Mašura

Slovak Academy of Sciences, Bratislava

 

Abstract: 'U' value expresses the polydispersity (heterogeneity) of cellulose and is dependent not only on the contents of low-mol. and high-mol. fractions but also on the av. degree of polymerization (DP) of the cellulose. Equal contents of low-mol. fractions in the cellulose with a higher av. DP increase the U value to a greater extent than in the cellulose with a lower av. DP. The U value of alkali celluloses from conventional sulfite pulps goes through a min. during aging at an av. DP 700 to 900. With further decrease of the DP by cleavage, the U value increases. Each type of pulp gives a characteristic U value of alkali cellulose during aging. The content of low-mol.-wt fractions of alkali cellulose after cleavage to the desired DP is dependent not only on the content in the original cellulose or on the content of α-cellulose, but also on other factors such as reactivity and accessibility.

Full paper in Portable Document Format: 159a668.pdf (in Slovak)

 

Chemical Papers 15 (9) 668–676 (1961)

Friday, June 14, 2024

IMPACT FACTOR 2021
2.146
SCImago Journal Rank 2021
0.365
SEARCH
Advanced
VOLUMES
European Symposium on Analytical Spectrometry ESAS 2022
© 2024 Chemical Papers