The influence of thermal history on water associated with polyelectrolytes and cellulose

✍ Scribed by Klaus Hofmann; Hyoe Hatakeyama

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 623 KB
• Volume: 196
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1995.021960106

✦ Synopsis

The formation of freezing water as a function of temperature and time has been studied in polyelectrolytes and in cellulose. In such systems, a portion of the sorbed water is not crystallizable under normal conditions. However, it was observed that in rapidly cooled systems the ratio between freezing and non-freezing water is variable and depends on the annealing temperature. The difference between the saturated concentration of freezable water and the concentration of freezing water which is formed immediately after the rise of the sample's temperature is dependent on the materials geometry. It is assumed that the rise of the annealing temperature above room temperature increases the amount of mobile water which can crystallize. By comparing the measured concentration of freezing water with desorption analysis, the average distance of transportation of mobile water for sodium carboxymethylcellulose was calculated as 8 -10 pm.