The morphology and mechanical properties of layer structured cellulose microfibril foams from ice-templating methods
The morphology and mechanical properties of layer structured cellulose microfibril foams from ice-templating methods
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DOI：
10.1039/c1sm05388d
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发表时间：
2011-01-01
期刊：
影响因子：
3.4
通讯作者：
Deng, Yulin
中科院分区：
文献类型：
--
作者：
Lee, Jihoon;Deng, Yulin
采用单向冷冻法成功制备了具有独特层状结构和可控孔道的冰模板纤维素微纤多孔泡沫材料。由1.0wt%悬浮液制备的纤维素微纤泡沫显示出交联的网络结构。将悬浮液中纤维素微纤丝的含量增加至2.75重量%导致从交联网络结构逐渐过渡到层状通道结构。增加悬浮液中的微纤丝浓度高达8.0重量%引起的壁厚和桥度的增加。通过改变冰锋和纤维素微纤丝悬浮液之间的温度梯度，可以将IT通道结构的波长控制在2.8 μ m到11.2 μ m之间。随着纤维素微纤维悬浮液浓度从2.0重量%增加到8.0重量%，IT纤维素微纤维泡沫的压缩应力从30.7 KPa线性增加到360.2 KPa。
Ice-templated (IT) cellulose microfibril porous foams with unique layer structure and controllable channels were successfully fabricated via unidirectional freezing methods. The cellulose microfibril foam prepared from 1.0 wt% suspension shows a cross-linked network structure. Increasing the content of the cellulose microfibril in the suspension up to 2.75 wt% led to a gradual transition from a crosslinked network structure to a lamellar channel structure. Increasing the concentration of microfibrils in the suspension up to 8.0 wt% caused an increase of the thickness of wall and bridge degree. The wavelength of IT channel structures could be controlled from 2.8 mu m to 11.2 mu m by changing the temperature gradient between the ice front and the cellulose microfibril suspension. The compressive stress of IT cellulose microfibril foams increases linearly from 30.7 KPa to 360.2 KPa with increasing concentrations of cellulose microfibril suspension from 2.0 wt% up to 8.0 wt%.