本文關(guān)鍵詞：高得率纖維素納米纖維及其高分子復(fù)合材料的制備與性能研究　出處：《南京林業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： ZnCl_2溶液 纖維素納米纖維 高得率 復(fù)合材料 面膜基材

【摘要】：納米纖維素纖維具有極大的比表面積,使其具有表面能高、活性強(qiáng)的特點(diǎn),使其在未來(lái)的多種領(lǐng)域有廣闊的應(yīng)用前景。以漂白針葉漿為原料,采用Zn Cl2水溶液預(yù)處理,并結(jié)合機(jī)械處理制備納米纖維(NFs),并對(duì)其進(jìn)行表征和分析。采用NFs懸浮液與環(huán)氧樹脂、丁苯膠乳溶液共混的方法制備NFs-環(huán)氧樹脂復(fù)合材料及NFs-丁苯膠乳復(fù)合材料,分析NFs對(duì)高分子材料的性能影響。制備納米纖維素膜作為面膜基材,并對(duì)其進(jìn)行表征及分析。1、以漂白針葉漿為原料,Zn Cl2水溶液為化學(xué)預(yù)處理溶劑,伴隨機(jī)械處理,制備NFs。采用單因素法,對(duì)工藝參數(shù):化學(xué)預(yù)處理時(shí)間、纖維濃度、機(jī)械處理時(shí)間進(jìn)行探索實(shí)驗(yàn)。通過(guò)實(shí)驗(yàn),最終確定了最佳工藝條件:纖維濃度1.5%、Zn Cl2溶解預(yù)處理時(shí)間為2.5 h、機(jī)械處理時(shí)間為25 min,得率達(dá)到75%。2、對(duì)以漂白針葉漿為原料,以Zn Cl2水溶液化學(xué)預(yù)處理并伴隨機(jī)械處理制備的NFs,分別以X-射線衍射(XRD)、傅里葉變化紅外光譜(FT-IR)、透射電鏡(TEM)分析、熱重分析(TG)技術(shù)進(jìn)行表征,發(fā)現(xiàn)Zn Cl2溶液預(yù)處理方法制備納米纖維的過(guò)程中,纖維晶型由纖維素Ⅰ型轉(zhuǎn)化為纖維素Ⅱ型,同時(shí)官能團(tuán)結(jié)構(gòu)未發(fā)生明顯變化,納米纖維的平均直徑約為10 nm。對(duì)比原纖維,NFs熱穩(wěn)定性略有提高。3、將NFs的乙醇分散液與環(huán)氧樹脂-聚酰胺樹脂的乙醇溶液共混,將溶劑蒸發(fā)制得NFs-環(huán)氧樹脂復(fù)合材料。分析NFs添加量對(duì)復(fù)合材料力學(xué)性能的影響,并分別以掃描電鏡(SEM)、傅里葉變化紅外光譜(FT-IR)技術(shù)對(duì)其進(jìn)行表征,發(fā)現(xiàn)NFs均勻分布在環(huán)氧樹脂中,NFs含量增加,NFs-環(huán)氧樹脂復(fù)合材料伸長(zhǎng)率持續(xù)增加,當(dāng)NFs含量7.5%時(shí)抗拉強(qiáng)度增加,當(dāng)NFs含量7.5%時(shí),抗拉強(qiáng)度下降。4、將NFs水溶液與丁苯膠乳溶液共混,將水分蒸發(fā)制得NFs-丁苯膠乳復(fù)合材料。分析NFs添加量對(duì)復(fù)合材料力學(xué)性能的影響,并分別以掃描電鏡(SEM)、傅里葉變化紅外光譜(FT-IR)技術(shù)對(duì)其進(jìn)行表征,發(fā)現(xiàn)NFs均勻分布在丁苯膠乳中,NFs能夠小幅度增加丁苯膠乳材料的拉伸強(qiáng)度,大幅度提高丁苯膠乳的裂斷伸長(zhǎng)率。當(dāng)NFs含量達(dá)到15%時(shí),復(fù)合材料的裂斷伸長(zhǎng)率達(dá)到162%。5、采用制備的NFs制得納米纖維素膜作為面膜基材。以掃描電鏡(SEM)對(duì)不同面膜基材進(jìn)行表征,并分析其最大吸水性能、保水性能。面膜厚度適中,呈凝膠狀,孔隙分布均勻,飽和吸水率為1400%,即吸水量為絕干的14倍,暴露于空氣中60min,保水率為75%。對(duì)精華液的吸附能力強(qiáng),對(duì)粘度為6 MPa?s的淀粉溶液吸附能力為含液量85%。
[Abstract]:Nanocellulose fiber has a great specific surface area, which makes it have high surface energy and strong activity. It has a broad application prospect in many fields in the future. Bleached needle pulp is used as raw material. Nano-fiber Cl2 was prepared by pretreatment with Zn Cl2 aqueous solution and combined with mechanical treatment. It was characterized and analyzed. NFs suspension and epoxy resin were used. NFs- epoxy resin composites and NFs- butadiene latex composites were prepared by blending benzene butadiene latex solution. The effects of NFs on the properties of polymer materials were analyzed. Nano-cellulose film was prepared as the surface film substrate, and characterized and analyzed. 1. Bleached needle pulp was used as raw material. Zn Cl2 aqueous solution was used as the solvent for chemical pretreatment, followed by mechanical treatment. The single factor method was used to prepare NFS. The process parameters were as follows: chemical pretreatment time, fiber concentration. Through the experiment, the optimum technological conditions were determined: the pretreatment time of the solution of Zn Cl2 was 2.5 h, the concentration of fiber was 1.5% and the pretreatment time of Zn Cl2 was 2.5 h. The mechanical treatment time is 25 min and the yield is 75. 2. The NFs prepared by chemical pretreatment with Zn Cl2 aqueous solution and accompanied by mechanical treatment is used as raw material of bleached conifer pulp. The structure was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and thermogravimetric analysis (TG). It was found that during the preparation of nanofibers by Zn Cl2 solution pretreatment, the crystalline form of the fibers changed from cellulose type I to cellulose type 鈪，

本文編號(hào)：1420216