The effect of morphological changes from pulp fiber towards nano-scale fibrillated cellulose on the mechanical properties of high-strength plant fiber based composites
The effect of morphological changes from pulp fiber towards nano-scale fibrillated cellulose on the mechanical properties of high-strength plant fiber based composites
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DOI：
10.1007/s00339-003-2453-5
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发表时间：
2004-03-01
影响因子：
2.7
通讯作者：
Yano, H
中科院分区：
文献类型：
--
作者：
Nakagaito, AN;Yano, H
将酚醛树脂浸渍的原纤化硫酸盐纸浆在100 MPa的极高压力下压缩以制备高强度纤维素纳米复合材料。为了评估纸浆纤维的原纤化程度如何影响最终复合材料的机械性能，将经过各种水平的精制和高压均质化处理的硫酸盐纸浆用作具有不同酚醛树脂含量的原材料。有人发现，纤维表面的原纤化是不是有效地提高复合材料的强度，虽然有一个明显的点在原纤化阶段，在该阶段的复合材料的机械性能的突然增加发生。在16和30次之间的范围内，通过精磨机处理，纸浆纤维经历了一定程度的原纤化，导致逐步增加的机械性能，最引人注目的是在弯曲强度。这种增加归因于大量纤维的完全原纤化。对于额外的高压均质处理的纸浆，复合强度线性增加对保水值，其特征在于纤维素的暴露的表面积，并达到最大值，在14次通过均质器。
Fibrillated kraft pulp impregnated with phenolic resin was compressed under an extremely high pressure of 100 MPa to produce high strength cellulose nanocomposites. To evaluate how the degree of fibrillation of pulp fiber affects the mechanical properties of the final composites, kraft pulp subjected to various levels of refining and high pressure homogenization treatments was used as raw material with different phenolic resin contents. It was found that fibrillation solely of the surface of the fibers is not effective in improving composite strength, though there is a distinct point in the fibrillation stage at which an abrupt increase in the mechanical properties of composites occurs. In the range between 16 and 30 passes through refiner treatments, pulp fibers underwent a degree of fibrillation that resulted in a stepwise increment of mechanical properties, most strikingly in bending strength. This increase was attributed to the complete fibrillation of the bulk of the fibers. For additional high pressure homogenization-treated pulps, composite strength increased linearly against water retention values, which characterize the cellulose's exposed surface area, and reached maximum value at 14 passes through the homogenizer.