改性亚麻纤维束提高环氧树脂复合材料纵向拉伸性能
Morphological modification of the technical flax fibre bundles to improve the longitudinal tensile properties of flax fibre reinforced epoxy composites
摘要：
就天然纤维作为复合材料增强体的拉伸性能而言，亚麻纤维将处于高端。然而，由于通过用于加工亚麻的传统纺织方法所造成的纤维损伤，将纤维特性有效地转化为其相应的复合特性一直是一个挑战。这些技术赋予纤维在微观和介观水平上的不利特征，这降低了亚麻纤维增强复合材料（FFRC）的力学性能。纤维的波动是在传统的纤维提取和织物制造路线期间发生的那些有害特征之一。这种起伏或波纹会在亚麻纤维中产生微压缩缺陷或扭结带，从而严重影响纤维增强复合材料的性能。生产具有最小起伏的亚麻织物可以在很大程度上减少微压缩缺陷。在这项研究中，非织造亚麻带的高度排列的亚麻纤维，共混有一个小比例的聚乳酸，聚乳酸已被制造部署一个新的技术。将由这些非织造带增强的复合材料与用织造Hopsack织物和经编单向UD织物增强的复合材料进行了比较，所述织物由起伏纤维组成。与Hopsack织物增强复合材料相比，用高度对齐的胶带增强的复合材料显示出高49%的纤维束强度和高100%的纤维束刚度。根据纤维的起伏、基本纤维的个体化、纤维分布的均匀性、树脂富集区的范围和纤维腔的浸渍程度，对结果进行了讨论。
英文摘要：
As far as the tensile properties of natural fibres as reinforcements for composites are concerned, flax fibres will stay at the top-end. However, an efficient conversion of fibre properties into their corresponding composite properties has been a challenge, due to the fibre damages done through the conventional textile methods utilised to process flax. These techniques impart disadvantageous features onto fibres at both micro, and mesolevel, which degrade the mechanical performances of flax fibre reinforced composites, FFRC. Undulation of fibre is one of those detrimental features that occur during traditional fibre extraction and fabric manufacturing routes. The undulation or waviness causes micro compressive defects or kink bands in elementary flax fibres, which significantly undermines the performance of FFRC. Manufacturing flax fabric with minimal undulation could diminish the micro compressive defects up to a substantial extent. In this research, nonwoven flax tapes of highly aligned flax fibres, blended with a small proportion of PLA, Polylactic Acid have been manufactured deploying a novel technique. Composites reinforced from those nonwoven tapes have been compared with composites reinforced with woven Hopsack fabrics and warp knitted unidirectional,UD fabrics from flax that are comprised of undulating fibres. The composites reinforced with the highly aligned tape have shown 49 percent higher fibre bundle strength, and 100 percent higher fibre bundle stiffness in comparison with that of the Hopsack fabric reinforced composites. The results have been discussed in the light of fibre undulation, elementary fibre individualisation, homogeneity of fibre distribution, extent of resin rich areas, and impregnation of the fibre lumens.
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