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自由的小鸟木虫 (正式写手)
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[求助]
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| 研究配置不同含水率的NMMO试剂，寻找溶解棉纤维素的最佳含水率；溶液的流变性能；制备纤维素膜时凝固浴温度、溶液的浓度、以及塑化剂甘油对纤维素膜力学性能、结晶性能、官能团组成等的影响。通过实验发现NMMO含水率在13.3%左右，溶解温度在90℃左右时棉纤维素溶解最快；通过溶液流变得到纤维素溶液是切力变稀体；通过纤维素膜力学性能测试发现，凝固浴温度在28℃时纤维素膜的断裂强度和断裂伸长率最高，断裂伸长率随着纤维素溶液浓度的升高而降低，断裂强度随着纤维素溶液浓度升高而升高；制膜时发现有塑化剂甘油作用，得到的纤维素膜表面光滑，在测试时发现纤维素膜有韧性；通过X射线衍射发现制备纤维素膜后纤维素结晶度下降；红外光谱分析后发现，制膜前后纤维素的官能团没有发生变化。 |
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genhunter
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自由的小鸟: 金币+300, 翻译EPI+1, ★★★★★最佳答案 2015-06-12 20:12:16
自由的小鸟: 金币+300, 翻译EPI+1, ★★★★★最佳答案 2015-06-12 20:12:16
| NMMO reagents with different water contents were prepared and studied for the optimum water content to dissolve cotton cellulose; The rheological properties of the solution was determined; Various parameters for the preparation of cellulose membrane by coagulation method, such as bath temperature and cellulose concentration were studied. In addition, the influence of the addition of glycerin as a plasticizer on cellulose membrane mechanical properties, crystallization properties, the composition of functional groups were studied. Through experiments we found that NMMO with a water content at around 13.3%, the temperature at about 90 DEG C had the fastest dissolution rate for cotton cellulose. Rheological studies indicated that the cellulose solution obtained was a shear thinning fluid. Mechanical properties tests on the cellulose membrane showed that cellulose membranes obtained under a coagulation bath temperature at 28 DEG C had the maximal fracture strength and elongation at break. The elongation at break decreased with increasing cellulose concentrations, while the fracture strength increased with increasing cellulose concentrations. Glycerol played a plasticizer role during membrane preparation, cellulose membrane with glycerol had a smooth surface, the tests found that the cellulose membrane prepared with glycerol had tenacity. Using X - ray diffraction method we found that cellulose in membranes had reduced crystallinity; infrared spectrometry analysis revealed that there was no change for the functional groups in cellulose before and after membrane preparation. |
2楼2015-06-12 16:13:25
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