Effects of Coagulation Conditions on the Properties of Regenerated Cellulose Films Prepared in NaOH/Urea Aqueous Solution
Effects of Coagulation Conditions on the Properties of Regenerated Cellulose Films Prepared in NaOH/Urea Aqueous Solution
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DOI：
10.1021/ie0491802
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发表时间：
2005-01
影响因子：
4.2
通讯作者：
Lina Zhang;Y. Mao;Jinping Zhou;J. Cai
中科院分区：
文献类型：
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作者：
Lina Zhang;Y. Mao;Jinping Zhou;J. Cai
采用~（13）CNMR、X射线衍射、扫描电镜、拉伸试验等方法研究了凝固剂组分和凝固条件对纤维素在7.5wt%NaOH/11wt%尿素水溶液中制备的再生纤维素膜结构和性能的影响，等。基于数字理论成果的均匀设计方法-采用理论方法对不同浓度（1 ~ 15wt%）、不同时间（1 ~ 15 min）、不同温度（25 ~ 55 °C）的H2SO 4水溶液的混凝条件进行了优化。此外，还研究了在25 °C下分别用5wt%H2SO4/Na 2SO 4、Na 2SO 4、HOAc和（NH 4）2SO 4凝结一系列RC膜;不同浓度（从1到20wt%）和时间（从1到20 min）。结果表明，混凝剂的最佳浓度和混凝时间分别为5wt%H2SO4 5 min，5wt%H2SO4/5wt%Na2SO4 5 min，5wt%Na2SO4 15 min，3wt%HOAc 5 min，5wt%Na2SO4 15 min。
Effects of coagulant components and coagulation conditions on the structure and properties of regenerated cellulose (RC) films prepared from cellulose in 7.5 wt % NaOH/11 wt % urea aqueous solution were investigated by 13C NMR, X-ray diffraction, scanning electron micrograph, tensile testing, etc. The uniform design method based on theoretical accomplishments in the number-theoretic method was used to optimize the coagulation conditions of H2SO4 aqueous solution with various concentrations (from 1 to 15 wt %), time (from 1 to 15 min), and temperature (from 25 to 55 °C). Moreover, a series of RC films coagulated, with 5 wt % H2SO4/Na2SO4, Na2SO4, HOAc, and (NH4)2SO4, respectively; different concentrations (from 1 to 20 wt %) and times (from 1 to 20 min) at 25 °C were also investigated. The results indicated that the optimal coagulant concentrations and coagulation times of the RC films are 5 wt % H2SO4 for 5 min, 5 wt % H2SO4/5 wt % Na2SO4 for 5 min, 5 wt % Na2SO4 for 15 min, 3 wt % HOAc for 5 min, and 5 w...