Viscosity molecular weight determination of polyadenylic acid
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Tarih
1995
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study viscosity measurements of polyadenylic acid (PolyA) in aqueous solution were carried out under different conditions. In the absence of any additives, the polymer degraded during flow through the capillary of a viscometer or when standing still. Degradation during the former was more severe. The degradation of polyadenylic acid can be prevented by addition of an electrolyte such as KC1 to increase the ionic strength. However, in this case the deviation from linearity was still considerable at most ionic strength values. The best fit to the Huggins and Kraemer equations was obtained using a Tris-EDTA buffer solution with a final pH of 7.65. Estimation from intrinsic viscosity and weight-average molecular weight values gave K and ? as 2.04 X 10 5 and 0.89 from the equation ? = KM ? . The difference between Huggins (k 1 ) and Kraemer (k' 1 ) constants was close to 0.50 for all measurements. © 1995, Taylor & Francis Group, LLC. All rights reserved.
Açıklama
Anahtar Kelimeler
Kaynak
Journal of Macromolecular Science, Part A
WoS Q Değeri
Scopus Q Değeri
Q2
Cilt
32
Sayı
3
