The effect of hemicelluloses on wood pulp nanofibrillation and nanofiber network characteristics
The effect of hemicelluloses on wood pulp nanofibrillation and nanofiber network characteristics
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DOI：
10.1021/bm701157n
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发表时间：
2008-03-01
影响因子：
6.2
通讯作者：
Yano, Hiroyuki
中科院分区：
文献类型：
--
作者：
Iwamoto, Shinichiro;Abe, Kentaro;Yano, Hiroyuki
半纤维素作为基体物质在木浆纳米纤维化过程中起着重要作用。使用研磨处理使具有不同量的半纤维素的从未干燥和一次干燥的纸浆原纤化。通过对原纤化纸浆的扫描电子显微镜观察和原纤化纸浆/丙烯酸树脂复合材料的透光率测量来评价原纤化程度。采用一次研磨处理，具有较高半纤维素含量的一次干燥纸浆与从未干燥的纸浆一样容易原纤化成10-20 nm宽的纤维，而具有较低半纤维素含量的一次干燥纸浆没有原纤化成均匀的纳米纤维。该结果表明，半纤维素在干燥期间充当微原纤维聚结的抑制剂，并且促进一次干燥的纸浆的纳米原纤化。此外，半纤维素提供纳米纤维之间的粘附，有助于降低复合材料的热膨胀和增强机械性能。
Hemicelluloses as matrix substances showed an important role in nanofibrillation of wood pulp. Never-dried and once-dried pulps with different amounts of hemicelluloses were fibrillated using a grinding treatment. The degree of fibrillation was evaluated by scanning electron microscopy observation of the fibrillated pulps and light transmittance measurements of the fibrillated pulp/acrylic resin composites. With a one-pass grinding treatment, the once-dried pulp with higher hernicellulose content was fibrillated into 10-20 nm wide fibers as easily as the never-dried pulps, while the once-dried pulp with lower hemicellulose content was not fibrillated into uniform nanosized fibers. This result indicates that hemicelluloses act as inhibitors of the coalescence of microfibrils during drying and facilitate the nanofibrillation of once-dried pulp. Furthermore, hemicelluloses provide adhesion between nanofibers, contributing to reduction of thermal expansion and enhancement of mechanical properties in the composites.