Dissolution and regeneration of cellulose in NaOH/thiourea aqueous solution

被引:287
作者
Zhang, LN [1 ]
Ruan, D [1 ]
Gao, SJ [1 ]
机构
[1] Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China
关键词
NaOH/thiourea aqueous solution; cellulose solvent; C-13; NMR;
D O I
10.1002/polb.10215
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A novel cellulose solvent, 1.5 M NaOH/0.65 M thiourea aqueous solution, was used to dissolve cotton linters having a molecular weight of 10.1 X 10(4) to prepare cellulose solution. Regenerated cellulose (RC) films were obtained from the cellulose solution by coagulating with sulfuric acid (H2SO4) aqueous solution with a concentration from 2 to 30 wt %. Solubility of cellulose, structure, and mechanical properties of the RC films were examined by infrared spectroscopy, X-ray diffraction, scanning electron microscopy, C-13 NMR, and tensile tests. C-13 NMR analysis indicated that the novel solvent of cellulose is a nonderivative aqueous solution system. The presence of thiourea enhanced significantly the solubility of cellulose in NaOH aqueous solution and reduced the formation of cellulose gel; as a result, thiourea prevented the association between cellulose molecules, leading to the solvation of cellulose. The RC film obtained by coagulating with 5 wt % H2SO4 aqueous solution for 5 min exhibited higher mechanical properties than that with other H2SO4 concentrations and a homogenous porous structure with a mean pore size of 186 nm for free surface in the wet state. The RC film plasticized with 10% glycerin for 5 min had a tensile strength of 107 MPa and breaking elongation of 10%, and about 1% glycerin in the RC film plays an important role in the enhancement of the mechanical properties. (C) 2002 Wiley Periodicals, Inc.
引用
收藏
页码:1521 / 1529
页数:9
相关论文
共 35 条
  • [1] BOCHEK AM, 1993, CELL CHEM TECHNOL, V27, P137
  • [2] Brown W., 1965, EUR POLYM J, V1, P1, DOI [DOI 10.1016/0014-3057(65)90041-8, 10.1016/0014-3057(65)90041-8]
  • [3] CRYSTALLIZATION OF CELLULOSE WITH N-METHYLMORPHOLINE N-OXIDE - NEW METHOD OF TEXTURING CELLULOSE
    CHANZY, H
    DUBE, M
    MARCHESSAULT, RH
    [J]. JOURNAL OF POLYMER SCIENCE PART C-POLYMER LETTERS, 1979, 17 (04) : 219 - 226
  • [4] CHEN LF, 1994, Patent No. 5290349
  • [5] A STUDY ON THE MECHANISM OF DISSOLUTION OF THE CELLULOSE/NH3/NH4SCN SYSTEM .1
    CUCULO, JA
    SMITH, CB
    SANGWATANAROJ, U
    STEJSKAL, EO
    SANKAR, SS
    [J]. JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 1994, 32 (02) : 229 - 239
  • [6] CUCULO JA, 1994, J POLYM SCI POL CHEM, V32, P241, DOI 10.1002/pola.1994.080320204
  • [7] Supermolecular structure and orientation of blown cellulosic films
    Fink, HP
    Weigel, P
    Bohn, A
    [J]. JOURNAL OF MACROMOLECULAR SCIENCE-PHYSICS, 1999, B38 (5-6): : 603 - 613
  • [8] Aqueous calcium thiocyanate solution as a cellulose solvent. Structure and interactions with cellulose
    Hattori, M
    Koga, T
    Shimaya, Y
    Saito, M
    [J]. POLYMER JOURNAL, 1998, 30 (01) : 43 - 48
  • [9] Solubility and dissolved cellulose in aqueous calcium- and sodium-thiocyanate solution
    Hattori, M
    Shimaya, Y
    Saito, M
    [J]. POLYMER JOURNAL, 1998, 30 (01) : 49 - 55
  • [10] POLYMER WASTE MANAGEMENT - BIODEGRADATION, INCINERATION, AND RECYCLING
    HUANG, SJ
    [J]. JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY, 1995, A32 (04): : 593 - 597