Effect of moisture content on thermal and water absorption properties of microfibrillar cellulose with polymeric additives.
Effect of moisture content on thermal and water absorption properties of microfibrillar cellulose with polymeric additives.
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水分含量对含有聚合物添加剂的微原纤纤维素的热性能和吸水性能的影响。
DOI：
10.1016/j.carbpol.2019.02.004
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发表时间：
2019
影响因子：
11.2
通讯作者：
Agarwal D
中科院分区：
文献类型：
--
作者：
Agarwal D
研究了均质前后添加羧甲基纤维素（CMC）和刺槐豆胶（LBG）等高分子添加剂对微纤纤维素（MFC）在干燥和半湿状态下的吸湿率的影响，以及高分子添加剂对低水分MFC热致结构转变的影响。高密度MFC网络中较高的水分含量保持原纤化网络结构，其在干燥过程中损失，导致MFC聚集体。聚合物添加剂的加入导致在干燥材料再分散时结构的恢复，其中CMC比LBG更有效。结果还表明，CMC与MFC具有高水平的相容性，而LBG似乎在MFC致密微纤维网络中具有有限的分布，并且当在均质化后添加时可能作为单独的相存在，然而LBG和纤维素的共处理显著改变了这种行为。MFC/添加剂/水混合物中低温转变的存在表明当在低水分环境（2%和20%w/w）中添加到MFC中时，这些半柔性聚合物添加剂参与液晶的形成。MFC和聚合物添加剂之间的表面相互作用的理论提供了一个见解，这可以防止在干燥时高度原纤化的悬浮液中存在的微纤维的团聚。
The aim of this study was 1) to investigate the influence of polymeric additives such as carboxyl methyl cellulose (CMC) and locust bean gum (LBG) addedbeforeandafter homogenisationon the moisture uptake of microfibrillar cellulose (MFC) in the dry and semi-wet state; and 2) to further understand the thermally induced structural transitions of low moisture MFC in the presence of the polymeric additives. A higher moisture content in the highly dense MFC network maintains the fibrillated network structure, which is lost during the drying process resulting in MFC aggregates. The addition of polymeric additives results in the regaining of the structure upon redispersion of the dry material with CMC being more effective than LBG). Results also indicated that CMC has a high level of compatibility with MFC, whereas LBG appears to have limited distribution in the MFC dense microfibrillar network and probably exists as a separate phase when added after homogenisation, however co-processing of LBG and cellulose significantly changed this behaviour. The presence of low-temperature transitions in MFC/additives/water mixtures indicates the involvement of these semi-flexible polymeric additives in the formation of liquid crystals when added to MFC in low moisture environments (2% and 20% w/w). An insight is offered into the theory of surface interactions between MFC and polymeric additives, which prevents the agglomeration of microfibrils present in the highly fibrillated suspension upon drying.
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