Effect of temperature on high pressure cellulose compression

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• 作者：Guadalupe Vaca-Medina ; Bastien Jallabert ; David Viet ; Jerome Peydecastaing…
• 关键词：Cellulose ; High pressure compression ; Mechanical testing ; Pressure–volume–temperature measurement ; Crystallinity index ; Water sorption isotherm ; Sintering
• 刊名：Cellulose
• 出版年：2013
• 出版时间：October 2013
• 年：2013
• 卷：20
• 期：5
• 页码：2311-2319
• 全文大小：637KB
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• 作者单位：Guadalupe Vaca-Medina (1) (2)
  Bastien Jallabert (1) (2)
  David Viet (3)
  Jerome Peydecastaing (1) (2)
  Antoine Rouilly (1) (2)
  
  1. LCA (Laboratoire de Chimie Agro Industrielle), INP-ENSIACET, Université de Toulouse, 31030, Toulouse, France
  2. INRA, UMR 1010 CAI, 31030, Toulouse, France
  3. The Green Factory, 27 rue Chanez, 75016, Paris, France
  
• ISSN：1572-882X

文摘

The effect of temperature during cellulose compression has been studied using mechanical testing, particle size analysis, density and pressure–volume–temperature (PVT) measurements, crystallinity index, scanning electron microscope photographs and water sorption isotherms. Commercial cellulose powder samples with different crystallinity levels were compacted at high pressure (177?MPa) for 10?min at two different temperatures: 25 and 160?°C. Three point bending test results for compressed samples are discussed. When pressure was applied directly to powders at room temperature, the cellulose sample with the highest level of crystallinity showed an increase in its crystallinity index of about 5?%, while this was about 22?% for the sample with the lowest level. These increases were even higher at 160?°C attaining 8 and 33?% respectively. Using density measurements, a densification phase related to this crystallinization was observed, and the PVT diagrams from different cellulose samples showed that this was associated with high temperatures. Water sorption isotherms were made on cellulose samples before and after compression. They showed a diminution of cellulose sorption capacity after compression at 160?°C, revealing the effect of temperature on high-pressure cellulose compression, reducing specific surface area. Events of this nature suggest a sintering mechanism, when temperature is associated with high pressure during cellulose compression.