Cellulose nanofibril-reinforced composites using aqueous dispersed ethylene-acrylic acid copolymer
Cellulose nanofibril-reinforced composites using aqueous dispersed ethylene-acrylic acid copolymer
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使用水分散乙烯-丙烯酸共聚物的纤维素纳米原纤维增强复合材料
作者：
A. Venkatesh;Johannes Thunberg;Tobias Moberg;M. Klingberg;L. Hammar;Anna Peterson;C. Müller;A. Boldizar
为了探索纤维素纳米纤维的增强性能，采用水辅助共混和模压成型相结合的方法制备了高含量的纤维素纳米纤维复合材料，其组成为纤维素纳米纤维悬浮液和聚烯烃共聚物聚(乙烯-丙烯酸)水分散体。复合样品的干纤维素纳米原纤维含量在10%~70%之间。计算机断层扫描显示纤维素纤维/纤维在聚合物基质中分散良好。最高含量为70%的纤维素纳米纤维使复合材料的强度和刚性分别提高了3.5倍和21倍，同时保持了约5%的断裂伸长率。当纤维素含量大于20%时，纤维纳米原纤维复合材料的强度和断裂应变均优于纸浆复合材料。纤维纳米纤维增强复合材料的刚性并不比纤维素纸浆纤维增强复合材料的刚性高。
In order to explore the reinforcing capabilities of cellulose nanofibrils, composites containing high contents of cellulose nanofibrils were prepared through a combination of water-assisted mixing and compression moulding, the components being a cellulose nanofibril suspension and an aqueous dispersion of the polyolefin copolymer poly(ethylene-co-acrylic acid). The composite samples had dry cellulose nanofibril contents from 10 to 70 vol%. Computed tomography revealed well dispersed cellulose fibril/fibres in the polymer matrix. The highest content of 70 vol% cellulose nanofibrils increased the strength and stiffness of the composites by factors of 3.5 and 21, respectively, while maintaining an elongation at break of about 5%. The strength and strain-at-break of cellulose nanofibril composites were superior to the pulp composites at cellulose contents greater than 20 vol%. The stiffness of the composites reinforced with cellulose nanofibrils was not higher than for that of composites reinforced with cellulose pulp fibres.Graphical Abstract