Effect of temperature on high pressure cellulose compression
Effect of temperature on high pressure cellulose compression
复制标题
温度对高压纤维素压缩的影响
DOI：
10.1007/s10570-013-9999-y
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发表时间：
2013
期刊：
影响因子：
5.7
通讯作者：
A. Rouilly
中科院分区：
文献类型：
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作者：
G. Vaca;Bastien Jallabert;D. Viet;J. Peydecastaing;A. Rouilly
通过力学测试、粒度分析、密度和压力-体积-温度(PVT)测量、结晶度指数、扫描电子显微镜照片和吸水等温线，研究了温度对纤维素压缩过程的影响。对不同结晶度的商业纤维素粉样品在25℃和160℃两种不同温度下，在高压(177℃)下压实10分钟，并对压缩样品的三点弯曲试验结果进行了讨论。当在室温下直接对粉末施加压力时，结晶度最高的纤维素样品的结晶度指数增加了约5%，而结晶度最低的样品的结晶度指数增加了约22%。在160摄氏度时，这些增幅甚至更高，分别达到8%和33%。利用密度测量，观察到了与这种结晶化相关的致密化阶段，来自不同纤维素样品的PVT图表明这与高温有关。测定了压缩前后纤维素样品的吸水等温线。在160℃压缩后，它们对纤维素的吸附能力有所下降，揭示了温度对高压纤维素压缩的影响，降低了比表面积。当温度与纤维素压缩过程中的高压有关时，这种性质的事件表明了一种烧结机制。
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.
DOI：
10.1201/9780203508206
发表时间：
2009-03
期刊：
--
影响因子：
--
作者：
A. Mohanty;M. Misra;L. Drzal
通讯作者：
A. Mohanty;M. Misra;L. Drzal