本文選題：再生纖維素 + 自增強(qiáng)�。� 參考：《青島科技大學(xué)》2015年碩士論文

【摘要】：本論文主要采用張俐娜院士發(fā)明的低溫NaOH/urea溶液溶解纖維素法制備高性能纖維素再生膜和GO雜化水凝膠復(fù)合材料。我們的主要工作分為三大部分。第一部分是探究凝固浴溫度對(duì)纖維素再生薄膜結(jié)構(gòu)和性能的影響。我們的工作是考察不同溫度的5wt%H2SO4/10wt%Na2SO4水溶液對(duì)再生薄膜結(jié)構(gòu)與性能的影響。通過DMA、UV-vis等儀器對(duì)再生膜的機(jī)械性能和光學(xué)性能進(jìn)行表征；使用SEM、XRD觀察再生膜內(nèi)部微結(jié)構(gòu)。實(shí)驗(yàn)結(jié)果表明較低溫度(5～20℃)凝固浴再生的纖維素薄膜內(nèi)部孔結(jié)構(gòu)排布密集且孔徑在0.2～0.3μm之間。當(dāng)凝固浴溫度上升到較高溫度(30～40℃)后,再生膜內(nèi)部孔徑尺寸為0.4μ m以上。當(dāng)凝固浴溫度升高后,再生膜對(duì)可見光的透過率會(huì)大幅降低,機(jī)械性能也出現(xiàn)損減。我們發(fā)現(xiàn)凝固浴為15℃時(shí),可以制備出光學(xué)性能和機(jī)械性能最優(yōu)的再生纖維素薄膜。第二部分主要是考察離心力大小對(duì)再生纖維素薄膜材料性能的影響。該部分工作主要是通過改變離心速率大小來探究纖維素溶解液中的未溶解部分的纖維晶束是否對(duì)再生膜能實(shí)現(xiàn)自增強(qiáng)。POM觀察纖維素溶解液中殘留的纖維晶束排布密度和長度。萬能拉力機(jī)、UV-vis測試儀分別表征再生膜機(jī)械性能和光學(xué)性能。我們發(fā)現(xiàn)以較低離心轉(zhuǎn)速對(duì)纖維素溶解液處理后,溶液中會(huì)殘存大量未溶解纖維晶束和未溶雜質(zhì)、氣泡等,尺寸較大。隨著離心轉(zhuǎn)速的提高,溶液中殘留的纖維晶束逐漸減少,且尺寸趨于微小。低離心轉(zhuǎn)速處理的纖維素溶解液中,大尺寸的纖維素晶束和雜質(zhì)、氣泡對(duì)再生膜的機(jī)械性能起到一定的損減作用。第三部分主要工作是制備GO雜化纖維素/CMC水凝膠。我們在該部分的工作是使用GO雜化纖維素/CMC水凝膠,借以提高后者的力學(xué)強(qiáng)度和機(jī)械穩(wěn)定性。DMA測定雜化水凝膠的機(jī)械強(qiáng)度。SEM觀察水凝膠內(nèi)部微孔結(jié)構(gòu)。UV-vis光譜測定GO在雜化水凝膠中的還原程度。水凝膠的熱穩(wěn)定性主要是使用TGA數(shù)據(jù)來表現(xiàn)。我們成功將氧化石墨烯加入到纖維素/CMC水凝膠體系中。當(dāng)加入石墨烯后,雜化水凝膠表現(xiàn)出強(qiáng)而硬的機(jī)械性,而其超吸水特性卻沒有受到影響。
[Abstract]:In this paper, high performance cellulose regenerative membrane and go hybrid hydrogel composite were prepared by NaOH/urea solution dissolving cellulose method developed by academician Zhang Lina. Our main work is divided into three parts. The first part is to explore the effect of coagulation bath temperature on the structure and properties of cellulose regenerated film. Our work is to investigate the effects of 5wt%H2SO4/10wt%Na2SO4 aqueous solution at different temperatures on the structure and properties of regenerated films. The mechanical and optical properties of the regenerated films were characterized by means of DMA-UV-vis and SEM XRD were used to observe the microstructure of the regenerated films. The experimental results show that the internal pore structure of cellulose film regenerated in the coagulation bath is dense and the pore diameter is between 0.2 渭 m and 0.3 渭 m. The internal pore size of regenerated membrane was more than 0.4 渭 m when the solidification bath temperature reached 30 ~ 40 鈩，

本文編號(hào)：1918013