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Free radical degradation of hydroxyethyl cellulose

Erkselius, Stefan LU and Karlsson, Ola LU (2005) In Carbohydrate Polymers 62(4). p.344-356
Abstract
The degradation of hydroxyethyl cellulose (HEC) using sodium persulfate (NaPS) as free radical generator was studied at 60, 70 and 80 degrees C with different NaPS/HEC ratios. During the degradation reaction samples were withdrawn at regular intervals. The amount of persulfate remaining was analyzed by titration and the evolution of the HEC molecular weight distribution and viscosity was followed using size exclusion chromatography (SEC) and rheology, respectively. The results show how the molecular weight of HEC is decreased by varying the NaPS/HEC ratio, reaction time and temperature. It was found that the NaPS/HEC ratio must be kept low in order to maintain the control of the degradation process, since when the NaPS/HEC ratio was too... (More)
The degradation of hydroxyethyl cellulose (HEC) using sodium persulfate (NaPS) as free radical generator was studied at 60, 70 and 80 degrees C with different NaPS/HEC ratios. During the degradation reaction samples were withdrawn at regular intervals. The amount of persulfate remaining was analyzed by titration and the evolution of the HEC molecular weight distribution and viscosity was followed using size exclusion chromatography (SEC) and rheology, respectively. The results show how the molecular weight of HEC is decreased by varying the NaPS/HEC ratio, reaction time and temperature. It was found that the NaPS/HEC ratio must be kept low in order to maintain the control of the degradation process, since when the NaPS/HEC ratio was too high the degradation rate of HEC was too fast, and the molecular weight distribution became bimodal. Additionally, the decomposition rate of NaPS was found to be independent of pH in the range between pH 2 and 7. (c) 2005 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Carbohydrate Polymers
volume
62
issue
4
pages
344 - 356
publisher
Elsevier
external identifiers
  • wos:000234244000007
  • scopus:28544435117
ISSN
0144-8617
DOI
10.1016/j.carbpol.2005.08.013
language
English
LU publication?
yes
id
5058db8c-b181-445b-ad66-77ddddcbd1d4 (old id 157380)
date added to LUP
2007-07-11 11:25:08
date last changed
2017-04-23 03:38:25
@article{5058db8c-b181-445b-ad66-77ddddcbd1d4,
  abstract     = {The degradation of hydroxyethyl cellulose (HEC) using sodium persulfate (NaPS) as free radical generator was studied at 60, 70 and 80 degrees C with different NaPS/HEC ratios. During the degradation reaction samples were withdrawn at regular intervals. The amount of persulfate remaining was analyzed by titration and the evolution of the HEC molecular weight distribution and viscosity was followed using size exclusion chromatography (SEC) and rheology, respectively. The results show how the molecular weight of HEC is decreased by varying the NaPS/HEC ratio, reaction time and temperature. It was found that the NaPS/HEC ratio must be kept low in order to maintain the control of the degradation process, since when the NaPS/HEC ratio was too high the degradation rate of HEC was too fast, and the molecular weight distribution became bimodal. Additionally, the decomposition rate of NaPS was found to be independent of pH in the range between pH 2 and 7. (c) 2005 Elsevier Ltd. All rights reserved.},
  author       = {Erkselius, Stefan and Karlsson, Ola},
  issn         = {0144-8617},
  language     = {eng},
  number       = {4},
  pages        = {344--356},
  publisher    = {Elsevier},
  series       = {Carbohydrate Polymers},
  title        = {Free radical degradation of hydroxyethyl cellulose},
  url          = {http://dx.doi.org/10.1016/j.carbpol.2005.08.013},
  volume       = {62},
  year         = {2005},
}