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首页> 外文期刊>Journal of Applied Polymer Science >Morphological and structural formation of the regenerated cellulose membranes recovered from its cuprammonium solution using aqueous sulfuric acid
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Morphological and structural formation of the regenerated cellulose membranes recovered from its cuprammonium solution using aqueous sulfuric acid

机译：使用硫酸水溶液从铜铵溶液中回收的再生纤维素膜的形态和结构形成

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摘要

Morphological and structural formation of the regenerated cellulose membranes from its cuprammonium hydroxide solution by acid coagulation was investigated. Scanning electron microscopic observation revealed that the morphology of the membranes changed drastically as functions of both the cellulose concentration in the original cellulose solution CCell and the concentration of sulfuric acid as a coagulant CH2SO4. It was found that at a constant polymer concentration (8 wt %) the membrane prepared by using 5 wt % aqueous sulfuric acid exhibits higher water flux, far smaller swelling anisotropy parameter Lt, and larger porosity Pr with a thinner skin structure, and these parameters were proven to be associated with lower (11 over-bar 0) crystal plane orientation coefficient f parallel (11 over-bar 0) compared with those for the membranes obtained by aqueous sulfuric acid with more than 10 wt %. On the other hand, at constant coagulant concentration (10 wt %) the membrane prepared by using the polymer solution with 5 wt % shows far greater Pr with practically no distinct skin structure; hence, a higher flux. The drastic changes in the morphology and structural parameters as functions of CCell and CH2SO4 were found to be well correlated with abrupt changes in material transportation (copper ion, ammonium ion, and water) from the polymer solution to aqueous coagulants as a function of CCell and CH2SO4.
机译：研究了通过酸凝固从氢氧化铜铵溶液中再生纤维素膜的形态和结构。扫描电子显微镜观察发现，膜的形态随着原始纤维素溶液CCell中的纤维素浓度和作为凝结剂CH 2 SO 4的硫酸浓度的变化而急剧变化。发现在恒定的聚合物浓度（8重量％）下，通过使用5重量％的硫酸水溶液制备的膜表现出更高的水通量，更小的溶胀各向异性参数Lt，以及更大的孔隙率Pr和更薄的皮肤结构，并且这些参数与由大于10wt％的硫酸水溶液获得的膜相比，被证明与较低的平行晶面取向系数f parallel（11 over-bar 0）（11 over-bar 0）相关。另一方面，在恒定的凝结剂浓度（10wt％）下，通过使用具有5wt％的聚合物溶液制备的膜显示出更高的Pr，实际上没有明显的皮肤结构。因此，通量更高。发现形态和结构参数的急剧变化与CCell和CH2SO4的功能密切相关，这与CCell和CH2SO4的功能从聚合物溶液到水性混凝剂的物质传输（铜离子，铵离子和水）的突然变化密切相关。硫酸

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