A small angle X-ray scattering study of pore structure in Tencel® cellulose fibres and the effects of physical treatments
A small angle X-ray scattering study of pore structure in Tencel® cellulose fibres and the effects of physical treatments
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DOI：
10.1016/s0032-3861(99)00502-9
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发表时间：
2000-06-01
期刊：
影响因子：
4.6
通讯作者：
Cameron, RE
中科院分区：
文献类型：
--
作者：
Crawshaw, J;Cameron, RE
当水溶胀的莱赛尔（Lyocell）纤维在160 ℃下反复干燥并再润湿时，进行原位SAXS实验。在所有情况下，干燥时空隙尺寸增加，空隙体积分数降低。水溶胀纤维显然由许多基本原纤维之间的小空隙网络组成。当水从纤维中排出时，较小的空隙塌陷，留下致密区域和一些大空隙。连续干燥循环影响孔隙结构。随着循环次数的增加，纤维中的湿孔隙体积分数和平行于纤维轴的孔隙长度减小。垂直于纤维轴的空隙参数没有显着变化。通过高压灭菌和在160 ℃下干燥的预处理导致类似的变化。观察结果与针对天然纤维素纤维提出的均质化机制一致，其中空隙在干燥期间通过在基本原纤维之间形成额外的氢键而部分或全部“压缩”，因此在再润湿时不能完全重新打开[Stone JE，Scallan AM.英国造纸和纸板制造商协会技术部门，1996年，第1页; Laivins GV，Scallan AM。造纸产品成绩单。在：贝克CF，编辑.第十届基础研究研讨会，第二卷。Oxford：Pira International，1993，p. 1235; Scallan AM.造纸过程中纤维与水的相互作用。1.《BPBIF研讨会论文集》，牛津，1977年]。(C)2000爱思唯尔科技有限公司版权所有。
In situ SAXS experiments were performed as water-swollen lyocell (Tencel(R)) fibres were repeatedly dried at 160 degrees C and re-wet. In all cases, the void size increased and the void volume fraction decreased on drying. The water-swollen fibre apparently consists of a network of small voids between many of the elementary fibrils. As the water is driven out of the fibre, smaller voids collapse leaving dense regions and a few large voids. Consecutive drying cycles affected the pore structure. The wet Volume fraction of voids and the void length parallel to the fibre axis decreased with increasing cycle number. The void parameters perpendicular to the fibre axis did not change significantly. Pretreatment by autoclaving and drying at 160 degrees C resulted in similar changes. The observations are consistent with the homification mechanism proposed for native cellulose fibres in which the voids are partially or totally 'zipped up' during drying by the formation of additional hydrogen bonds between elementary fibrils and are thus not able to reopen fully on re-wetting [Stone JE, Scallan AM. Technical section of the British Paper and Board Makers' Association, 1996, p. 1; Laivins GV, Scallan AM. Transcript of products of paper making. In: Baker CF, editor. Tenth Fundamental Research Symposium, vol.2. Oxford: Pira International, 1993, p. 1235; Scallan AM. Fibre-water interactions in paper making. 1. Transactions of BPBIF Symposium, Oxford, 1977]. (C) 2000 Elsevier Science Ltd. All rights reserved.