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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Coagulation Conditions on Fine Structure of Regenerated Cellulosic Films Made from Cellulose/N-Methylmorpholine-N-Oxide/H_2O Systems
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Effect of Coagulation Conditions on Fine Structure of Regenerated Cellulosic Films Made from Cellulose/N-Methylmorpholine-N-Oxide/H_2O Systems

机译：混凝条件对纤维素/ N-甲基吗啉-N-氧化物/ H_2O体系制备的再生纤维素膜微结构的影响

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摘要

The important properties of cellulosic fibers in the conditioned state are mainly influenced by fine structure. In particular, te development of new methods of spinning regenerated cellulosic fibers made from a cellulose/N-methylmorpholine-N-oxide (NMMO)/H_2O system require a better understanding of their fine structures in order to explain their special physical properties. The regenerated cellulosic films were made from cellulose/NMMO/H_2O according to the degree of polymerization and solution concentration (wt %) of cellulose and the concentration (wt %) of NMMO in the coagulation bath. The quantification of crystal content was carried out by the resolution of the wide angle X-ray diffraction intensity distriburtion on the assumption that all diffracted intensities take the form of a symmetrical Gaussian distribtuion centering at its Bragg angle. The X-ray diffraction patterns resolved into individual integral inten-sities showed that the polymorphic structure mixed with part cellulose III and II was obtained for only coagulated cellulose films. The degree of crystallinity and apparent crystalline size of regenerated cellulosic films depended on the degree of polymerization, the solution concentration of cellulose, and the concentration of NMMO. The diameter of the microfibril decreased with an increase in the concentration of NMMO.
机译：处于调节状态的纤维素纤维的重要性能主要受精细结构的影响。特别地，开发由纤维素/ N-甲基吗啉-N-氧化物（NMMO）/ H_2O系统制成的纺制再生纤维素纤维的新方法需要对它们的精细结构有更好的理解，以解释其特殊的物理性能。根据纤维素的聚合度和溶液浓度（wt％）和凝固浴中NMMO的浓度（wt％），由纤维素/ NMMO / H_2O制成再生纤维素膜。晶体含量的定量通过广角X射线衍射强度分布的解析来进行，其假设是所有衍射强度采取以布拉格角为中心的对称高斯分布形式。分解成单独整体强度的X射线衍射图表明，仅对于凝结的纤维素膜，获得了与部分纤维素III和II混合的多晶型结构。再生纤维素膜的结晶度和表观晶体尺寸取决于聚合度，纤维素的溶液浓度和NMMO的浓度。微纤维的直径随着NMMO浓度的增加而减小。

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