Lyocell纤维具有易原纤化的特性,但通过对其原纤化进行调控,也能带来许多优点,扩大其应用领域.文中以不同质量分数的NaOH溶液为溶胀剂,采用超声波振荡法制备了不同原纤化程度的Lyocell纤维,并探讨了NaOH质量分数对其结构与性能的影响.结果表明,随着NaOH质量分数的提高,Lyocell纤维的原纤化程度先增大后变小,当NaOH质量分数为3％时,纤维的原纤化程度最显著.采用保水值和比表面积均可表征Lyocell纤维原纤化程度,两者变化规律一致,当NaOH质量分数为3％时,纤维的保水值和比表面积分别提高了118.9％和47.9％.纤维的结晶度随NaOH质量分数的增大而略有提高;当NaOH质量分数较低时,对纤维力学性能影响较小.
Lyocell fibers have an extensive tendency to fibrillate.By controlling the fibrillation degree in Lyocell fibers,this fibrillation tendency may be exploited to achieve various special effects and expand the application fields.In this work,the fibrillation tendency of Lyocell fibers in different mass fraction NaOH solutions,as swelling agent,was investigated by using the high-intensity ultrasonication to isolate fibrils.And the relationship between the fibrillation degree of Lyocell fibers and their physical properties was studied.The results show that the fibrillation degree of Lyocell fibers is increased firstly and then decreased with the increasing mass fraction of NaOH solutions.When the mass fraction of NaOH solutions is 3 ％,Lyocell fibers show the highest fibrillation degree.The fibrillation degree can be evaluated with water retention value (WRV) and specific surface area,which show the same changing trends.WRV and specific surface area of Lyocell fibers are increased by 118.9％ and 47.9％ respectively,when NaOH mass fraction is 3 ％.The crystallinity of the fibers is increased slightly with the increasing mass fraction of NaOH solutions.At the Same time,the mechanical properties of the fibers are less affected when the NaOH mass fraction is lower.
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