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自由的小鳥(niǎo)木蟲(chóng) (正式寫(xiě)手)
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[求助]
本科論文摘要翻譯 在線(xiàn)等
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| 研究配置不同含水率的NMMO試劑，尋找溶解棉纖維素的最佳含水率；溶液的流變性能；制備纖維素膜時(shí)凝固浴溫度、溶液的濃度、以及塑化劑甘油對(duì)纖維素膜力學(xué)性能、結(jié)晶性能、官能團(tuán)組成等的影響。通過(guò)實(shí)驗(yàn)發(fā)現(xiàn)NMMO含水率在13.3%左右，溶解溫度在90℃左右時(shí)棉纖維素溶解最快；通過(guò)溶液流變得到纖維素溶液是切力變稀體；通過(guò)纖維素膜力學(xué)性能測(cè)試發(fā)現(xiàn)，凝固浴溫度在28℃時(shí)纖維素膜的斷裂強(qiáng)度和斷裂伸長(zhǎng)率最高，斷裂伸長(zhǎng)率隨著纖維素溶液濃度的升高而降低，斷裂強(qiáng)度隨著纖維素溶液濃度升高而升高；制膜時(shí)發(fā)現(xiàn)有塑化劑甘油作用，得到的纖維素膜表面光滑，在測(cè)試時(shí)發(fā)現(xiàn)纖維素膜有韌性；通過(guò)X射線(xiàn)衍射發(fā)現(xiàn)制備纖維素膜后纖維素結(jié)晶度下降；紅外光譜分析后發(fā)現(xiàn)，制膜前后纖維素的官能團(tuán)沒(méi)有發(fā)生變化。 |
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genhunter
至尊木蟲(chóng) (著名寫(xiě)手)
- 翻譯EPI: 387
- 應(yīng)助: 259 (大學(xué)生)
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- 蟲(chóng)號(hào): 2558361
- 注冊(cè): 2013-07-22
- 專(zhuān)業(yè): 腫瘤化學(xué)藥物治療
【答案】應(yīng)助回帖
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自由的小鳥(niǎo): 金幣+300, 翻譯EPI+1, ★★★★★最佳答案 2015-06-12 20:12:16
自由的小鳥(niǎo): 金幣+300, 翻譯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樓2015-06-12 16:13:25
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