Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran.
Carbohydr Polym. 2013 Jun 5;95(1):57-63. doi: 10.1016/j.carbpol.2013.02.040. Epub 2013 Mar 1.
In this study two imidazole-based ionic liquids (ILs), namely 1-butyl-3-methyl-1-imidazolium chloride ([BMIM]Cl) and 1,3-methyl imidazolium dimethyl sulfate ([DiMIM][MeSO4]), were used to dissolve ball-milled poplar wood (PW), chemi-mechanical pulp (CMP), and cotton linter (CEL). A set of comparative experiments was carried out, and physical and mechanical properties of the composite films from three different raw materials were determined by means of optical transparency (OT), scanning electron microscopy (SEM), water absorption (WA), thickness swelling (TS), water vapor permeability (WVP), and tensile strength (σb). The overall evaluation indicates the inability of [DiMIM][MeSO4] in complete dissolution of lignocellulosic materials, and sample treatment with this solvent did not lead to water soluble degradation products. However, dissolution trials using [BMIM]Cl were able to dissolve all used lignocellulosic materials by destroying inter and intramolecular hydrogen bonds between lignocelluloses. The OT, WA, TS, and σb of regenerated CEL films were much higher than those of CMP and PW composites. In addition, CEL film showed the lowest WVP compared to WF and CMP composite films. This work demonstrated a promising route for the preparation of biodegradable green cellulose composite films.
在这项研究中，使用了两种咪唑基离子液体（ILs），即 1-丁基-3-甲基-1-咪唑氯化物([BMIM]Cl)和 1,3-甲基咪唑二甲基硫酸盐([DiMIM][MeSO4])，来溶解球磨杨木(PW)、化学机械浆(CMP)和棉绒(CEL)。进行了一组对比实验，通过光学透明度(OT)、扫描电子显微镜(SEM)、吸水率(WA)、厚度膨胀率(TS)、水蒸气透过率(WVP)和拉伸强度(σb)来确定三种不同原料的复合膜的物理和机械性能。总体评价表明，[DiMIM][MeSO4]无法完全溶解木质纤维素材料，并且用该溶剂处理样品不会导致水溶性降解产物。然而，使用[BMIM]Cl 的溶解试验能够通过破坏木质纤维素之间的分子内和分子间氢键来溶解所有使用的木质纤维素材料。再生 CEL 薄膜的 OT、WA、TS 和 σb 均高于 CMP 和 PW 复合材料。此外，CEL 薄膜的 WVP 与 WF 和 CMP 复合薄膜相比最低。这项工作为制备可生物降解的绿色纤维素复合薄膜提供了一条有前途的途径。
