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ABSTRACT
Hemicellulose and lignin were progressively removed from hemp fiber by hydrolysis. SEM, FTIR, XRD analysis and tensile properties evaluation on technical fibers were carried out to understand the structural and mechanical properties of hemp fibers. Significant influence of hemicellulose and lignin content on tensile properties was verified by ANOVA. The fiber tensile strength and initial modulus were decreased with the extensive removal of hemicellulose, along with a constant increasing of elongation at rupture. Torsion and expansion were observed in hemp fibers. It was suggested that the internal structure destruction and reorganization in the ultimate fiber cells was the main reason for the variation of mechanical properties when hemicellulose was gradually dissolved. On the other hand, fiber individualization was achieved by lignin removal and contributed to the elevation of fiber tensile properties. The elongation at break of the hemp fibers decreased slightly with the removal of lignin. NaClO2 solution treatment affected the fiber cells slightly, but effectively changed the properties of the middle lamella jointing between the ultimate fiber cells. The mechanical properties of the hemp fiber were mainly decided by the shearing between single fibers caused by the plastic-like deformation of the middle lamella.
摘要
半纤维素和木质素通过水解逐渐从大麻纤维中去除. 对大麻纤维进行了SEM、FTIR、XRD分析和拉伸性能评价，以了解大麻纤维的结构和力学性能. 通过方差分析验证了半纤维素和木质素含量对拉伸性能的显著影响. 随着半纤维素的广泛去除，纤维的拉伸强度和初始模量降低，断裂伸长率不断增加. 在大麻纤维中观察到扭转和膨胀. 结果表明，最终纤维细胞的内部结构破坏和重组是半纤维素逐渐溶解时力学性能变化的主要原因. 另一方面，通过去除木质素实现了纤维的个性化，并有助于提高纤维的拉伸性能. 随着木质素的去除，大麻纤维的断裂伸长率略有下降. NaClO2溶液处理对纤维细胞的影响较小，但有效地改变了最终纤维细胞之间的中间层连接的性质. 大麻纤维的力学性能主要由中间薄片的塑性变形引起的单纤维之间的剪切决定.
Disclosure statement
No potential conflict of interest was reported by the author(s).