Influence of Chemical Treatments and Nanocellulose Spray Coating on the Mechanical, Low Velocity Impact and Compression after Impact Performance of Nonwoven Jute Composites

This paper reports the preparation and characterization of nonwoven jute composites. The untreated and chemically treated waste jute fibers were used to prepare needlepunched nonwoven fabrics. The treated waste jute fibers were also used to extract nanocellulose by pulverization, followed by acid hydrolysis. The prepared 2 wt% suspension of nanocellulose was spray coated over chemically treated nonwoven jute fabric. Afterward, the composites were prepared by compression molding technique. The surface morphologies of treated jute fibers and nanocellulose were characterized by scanning electron microscopy. The crystallinity of chemically treated jute fibers and nanocellulose was measured by X-ray diffraction. The effect of chemical treatments and nanocellulose spray coating over nonwoven jute reinforcement on the tensile, flexural, drop weight impact, and compression after impact properties of prepared composites has been investigated. The results revealed the improvement in mechanical properties after chemical treatments and nanocellulose coating. The overall better results were shown by composite sample prepared from chemically treated followed by nanocellulose sprayed jute nonwoven reinforcement. 摘要 本文报道了非织造黄麻复合材料的制备与表征.采用未经处理和化学处理的黄麻废纤维制备针刺非织造布.将处理后的废黄麻纤维粉碎后酸水解，提取纳米纤维素.在化学处理的非织造黄麻织物上喷涂制备的2%%的纳米纤维素悬浮液.然后，采用压缩成型技术制备了复合材料.采用扫描电镜（SEM）对处理后的黄麻纤维和纳米纤维素的表面形貌进行了表征.采用X射线衍射（XRD）对化学处理后的黄麻纤维和纳米纤维素的结晶度进行了测定.研究了化学处理和纳米纤维素喷涂对非织造黄麻增强复合材料的拉伸、弯曲、落锤冲击和压缩后冲击性能的影响.结果表明，经过化学处理和纳米纤维素涂层后，材料的力学性能有所改善.经化学处理后，再经纳米纤维素喷涂的黄麻非织造布增强，制备的复合材料样品总体效果较好