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

以日本采收的JBF和中国采收的CBF两种红麻纤维为原料，研究了有效制浆和硫化纤维的制备，并与主要原料棉绒浆的硫化纤维进行了性能比较。与JBF相比，CBF的碱- aq和硫酸盐浆的kappa值和灰分含量较低，出浆率较高。以麻麻纤维浆为原料制备的手纸具有较高的氯化锌吸收率。一般情况下，硫化后手板的强度（拉伸强度和胶合强度）、密度、伸长率和葡萄糖含量均有所提高，不透明度、厚度、结晶度和木糖含量均有所降低。在相同的处理条件下，低木质素含量的CBF未漂白样品比高木质素含量的JBF受硫化工艺的影响更大，因此获得了更好的强度。然而，在漂白样品中，两种韧皮纤维的硫化样品之间没有明显差异，它们与棉绒的样品相当。扫描电镜观察显示了纤维表面的糊化和纤维与纤维结合的过程，这是硫化的结果。实验结果表明，红麻韧皮纤维浆可作为一种潜在的硫化纤维原料。通过对纤维片进行乙酰化处理，提高了纤维片的湿强性能。

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.