版塊導(dǎo)航: 正在加載中...

應(yīng)《網(wǎng)絡(luò)安全法》要求，自2017年10月1日起，未進(jìn)行實(shí)名認(rèn)證將不得使用互聯(lián)網(wǎng)跟帖服務(wù)。為保障您的帳號(hào)能夠正常使用，請(qǐng)盡快對(duì)帳號(hào)進(jìn)行手機(jī)號(hào)驗(yàn)證，感謝您的理解與支持！

24小時(shí)熱門版塊排行榜

返回列表

本帖產(chǎn)生 1 個(gè) 翻譯EPI ，點(diǎn)擊這里進(jìn)行查看

自由的小鳥

木蟲 (正式寫手)

應(yīng)助: 0 (幼兒園)
金幣: 2535.4
散金: 666
紅花: 6
帖子: 652
在線: 126.3小時(shí)
蟲號(hào): 2762709
注冊(cè): 2013-10-29
性別: GG
專業(yè): 高分子合成化學(xué)

[求助] 本科論文摘要翻譯在線等

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；通過溶液流變得到纖維素溶液是切力變稀體；通過纖維素膜力學(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)度和斷裂伸長率最高，斷裂伸長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X射線衍射發(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)沒有發(fā)生變化。

回復(fù)此樓

» 猜你喜歡

327求調(diào)劑已經(jīng)有5人回復(fù)
361求調(diào)劑已經(jīng)有3人回復(fù)
一志愿中南大學(xué)化學(xué)學(xué)碩0703總分337求調(diào)劑已經(jīng)有5人回復(fù)
一志愿北京化工大學(xué) 070300 學(xué)碩 336分求調(diào)劑已經(jīng)有6人回復(fù)
材料專業(yè)求調(diào)劑已經(jīng)有10人回復(fù)
341求調(diào)劑(一志愿湖南大學(xué)070300) 已經(jīng)有5人回復(fù)
0854 考研調(diào)劑招生了！AI 方向已經(jīng)有15人回復(fù)
384求調(diào)劑已經(jīng)有6人回復(fù)
生物學(xué)學(xué)碩求調(diào)劑已經(jīng)有4人回復(fù)
081700 調(diào)劑 267分已經(jīng)有6人回復(fù)

山窮水復(fù)疑無路柳暗花明又一村

1樓 2015-06-12 08:50:22

已閱回復(fù)此樓關(guān)注TA 給TA發(fā)消息送TA紅花 TA的回帖

genhunter

至尊木蟲 (著名寫手)

翻譯EPI: 387
應(yīng)助: 259 (大學(xué)生)
金幣: 9757.4
散金: 10
紅花: 60
帖子: 2484
在線: 1793小時(shí)
蟲號(hào): 2558361
注冊(cè): 2013-07-22
專業(yè): 腫瘤化學(xué)藥物治療

【答案】應(yīng)助回帖

★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ...
自由的小鳥: 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.

贊一下

回復(fù)此樓

離成功還差一點(diǎn)

2樓2015-06-12 16:13:25

已閱回復(fù)此樓關(guān)注TA 給TA發(fā)消息送TA紅花 TA的回帖

相關(guān)版塊跳轉(zhuǎn) 我要訂閱樓主自由的小鳥的主題更新