Preparation of vulcanized Fibers from kenaf pulps and improving of their strength properties.

采用两种红麻韧皮纤维，（在日本收获）和CBF（在中国收获和腌制），研究了一种高效的制浆方法，制备了硫化纤维，并与棉短绒浆硫化纤维的性能进行了比较（主要原料）。苏打-与JBF相比，CBF的AQ浆和硫酸盐浆的卡伯值和灰分较低，浆得率较高显示出高吸收值的氯化锌。一般情况下，手抄纸的强度（拉伸强度和抗张强度）、密度、伸长率和葡萄糖含量在硫化后增加，而它们的不透明度、厚度、结晶度和木糖含量在硫化后降低。在相同的处理条件下，木质素含量低的CBF未漂试样比木质素含量高的JBF未漂试样受硫化处理的影响更大，从而获得更好的强度。而漂白样品的硫化样品与棉短绒样品的硫化样品无显著差异，SEM观察表明，由于硫化作用，纤维表面发生了凝胶化，纤维与纤维之间的结合也发生了变化。结果表明，红麻韧皮纤维浆是一种很有潜力的硫化纤维原料。通过乙酰化改性提高了纤维片材的湿强性能。

Using two kinds of kenaf bast fiber, JBF (harvested in Japan) and CBF (harvested and retted in China), effective pulping and preparation of vulcanized fibers were investigated and their properties were compared with the vulcanized fiber from cotton linter pulp (the major raw material).The soda-AQ and kraft puips of CBF had lower kappa number and ash content with greater pulp yield than those of JBF.The handsheets prepared from kenaf bast fi ber pulps showed high absorption value of zinc chloride. In general, the strengths (tensile and ply-bond), density, elongation and glucose content of the handsheets were increased and their opacity, thickness, crystalinity and xylose content were decreased after vulcanization. Under the same treatment conditions employed, the unbleached samples of CBF with low lignin content were affected more than those of JBF with higher lignin content by vulcanization processes and accordingly gained better strengths. However, in the case of bleached samples, there was no significant difference observed between of vulcanized samples of both bast fibers and they were quite compalable to those of cotton linter.SEM observation revealed the gelatinization of the fiber surfaces and the progress of the fiber-to-fiber bonding as a result of vulcanization. The data obtained here show that the kenaf bast fiber pulps could be employed as a potential raw material for vulcanized fiber. The wet strength properties were improved by acetylation of the fiber sheets.