A promising reinforcement for textile composites: Study on the effect of cellulose nanofiber (CNF) content on the mechanical properties of CNF reinforced epoxy resin
A promising reinforcement for textile composites: Study on the effect of cellulose nanofiber (CNF) content on the mechanical properties of CNF reinforced epoxy resin
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DOI：
10.1088/1757-899x/406/1/012037
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发表时间：
2018-08
期刊：
影响因子：
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通讯作者：
Xingsheng Li;K. Hanaki;X. Wang;T. Kurashiki;K. Mukoyama
中科院分区：
文献类型：
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作者：
Xingsheng Li;K. Hanaki;X. Wang;T. Kurashiki;K. Mukoyama
研究了CNF体积分数对不同基体树脂（乙烯基改性环氧酯树脂乳液、环氧改性醇酸树脂乳液）的增强效果。拉伸剪切试验按照JIS K 6850：1999标准，通过将该胶体混合物涂布在基材上进行。结果表明，在相对湿度为32.78%时，两种水性树脂的最大剪切强度均随CNF加入量的增加而增加。认为纤维与基体之间存在氢键，CNF的三维网络结构缓解了应力集中，提高了最大应力，抑制了裂纹的产生和发展。但它会导致伸长率值的损失。在10wt.%处发现变形能的峰值，其被认为是三维网络增强和CNF在界面处聚集的力平衡点。CNF增强体对湿度敏感，环氧酯基体比醇酸基体更易受湿度影响，在低湿度（32.78%RH）下，环氧酯基体比醇酸基体具有更大的变形能，在高湿度（97.30%RH）下，虽然变形能显著降低，但仍具有与醇酸基体相适应的湿度。
The reinforcement effect of volume fraction of CNF on different matrix resin (vinyl-modified epoxy ester resin emulsion; epoxy-modified alkyd emulsion) are investigated in this study. Tensile shear test is carried out following the JIS K 6850:1999 standard, by coating this colloid mixture on substrates. The results show that the maximum shear strength of both waterborne resin increase with the addition amount of CNF at relative humidity 32.78%. It is considered that there exits hydrogen bonding between fiber and matrix, and the stress concentration might be relieved by the 3-D network structure of CNF, thus the maximum stress is increased, and the crack generation and development is suppressed. But it leads to a loss of percentage elongation values. A peak of the deformation energy is found at 10wt.%, which is considered as a force balance point of 3-D network reinforcement and the aggregation of CNF at the interface. The reinforcement of CNF is sensitive to humidity, for epoxy ester matrix is found more easily influenced by humidity than alkyd matrix, which has bigger deformation energy than alkyd matrix in low humidity(32.78%RH), although deformation energy dramatically decreases in high humidity(97.30%RH), it still has compatible humidity as alkyd matrix.