聚丙烯酸钠/纳米纤维素晶体-g-聚丙烯酰胺复合高吸水性树脂的制备与表征
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摘要
先用铈(Ⅳ)盐引发丙烯酰胺(AM)在纳米纤维素晶体(NCC)表面接枝聚合,接枝产物NCC-g-PAM可稳定地分散在丙烯酸钠/丙烯酸混合单体水溶液中,然后以N,N-亚甲基双丙烯酰胺作交联剂通过原位光聚合制得聚丙烯酸钠(PAANa)/NCC-g-PAM复合高吸水性树脂。用红外光谱、X射线衍射、元素分析等方法对NCC-g-PAM进行了表征,通过红外光谱、扫描电镜、溶胀实验考察了NCC-g-PAM的添加对高吸水性树脂结构、形貌和吸水性能的影响。结果表明,NCC-g-PAM中NCC的晶态结构未改变,聚丙烯酰胺(PAM)的含量为59.54%。PAANa/NCC-g-PAM复合高吸水性树脂具有丰富的网孔结构,NCC-g-PAM中的PAM链与PAANa基体间形成了氢键。与PAANa高吸水性树脂相比,PAANa/NCC-g-PAM复合高吸水性树脂的吸水倍率和吸水速率均有所增加,吸水倍率最高可达3000 g/g,是PAANa的3.2倍,吸生理盐水倍率最高可达139 g/g,是PAANa的2.5倍。
Acrylamide( AM) was grafted onto the surface of nanocrystalline cellulose( NCC) by initiating of cerium( Ⅳ) salt to give NCC-g-PAM,which can disperse stably in the solution of mixed sodium acrylate( AANa)/acrylic acid( AA) monomers. NCC-g-PAM was further in situ photopolymerized with AANa/AA monomers to obtain PAANa/NCCg-PAM superabsorbent composites with N,N'-methylenebisacrylamide as crosslinker. NCC-g-PAM was characterized by IR,XRD and elemental analysis. The structure,morphology and water absorption of PAANa/NCC-g-PAM superabsorbent composites were investigated by IR,SEM and swelling test. The results show that the crystalline structure of NCC in NCC-g-PAM remains,and the PAM content in NCC-g-PAM is 59. 54%. The PAANa/NCC-g-PAM superabsorbent composites have rich mesh structure,and hydrogen bonds are formed between the PAM segments in NCC-g-PAM and the PAANa matrix. Water absorption capacity and water absorption rate of the PAANa/NCC-g-PAM superabsorbent composites are higher than of the PAANa superabsorbent. The highest water absorption capacity of PAANa/NCC-g-PAM is 3000 g/g,which is 3. 2 times of PAANa. The highest normal saline absorption capacity of PAANa/NCC-g-PAM is 139 g/g,which is 2. 5 times of PAANa.
Acrylamide( AM) was grafted onto the surface of nanocrystalline cellulose( NCC) by initiating of cerium( Ⅳ) salt to give NCC-g-PAM,which can disperse stably in the solution of mixed sodium acrylate( AANa)/acrylic acid( AA) monomers. NCC-g-PAM was further in situ photopolymerized with AANa/AA monomers to obtain PAANa/NCCg-PAM superabsorbent composites with N,N'-methylenebisacrylamide as crosslinker. NCC-g-PAM was characterized by IR,XRD and elemental analysis. The structure,morphology and water absorption of PAANa/NCC-g-PAM superabsorbent composites were investigated by IR,SEM and swelling test. The results show that the crystalline structure of NCC in NCC-g-PAM remains,and the PAM content in NCC-g-PAM is 59. 54%. The PAANa/NCC-g-PAM superabsorbent composites have rich mesh structure,and hydrogen bonds are formed between the PAM segments in NCC-g-PAM and the PAANa matrix. Water absorption capacity and water absorption rate of the PAANa/NCC-g-PAM superabsorbent composites are higher than of the PAANa superabsorbent. The highest water absorption capacity of PAANa/NCC-g-PAM is 3000 g/g,which is 3. 2 times of PAANa. The highest normal saline absorption capacity of PAANa/NCC-g-PAM is 139 g/g,which is 2. 5 times of PAANa.
引文
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[3]Huang Y W,Zeng M,Ren J,et al.Preparation and swelling properties of graphene oxide/poly(acrylic acid-co-acrylamide)superabsorbent hydrogel nanocomposites[J].Colloids Surf.,A,2012,401:97-106.
[4]Samir M,Alloin F,Dufresne A.Review of recent research into cellulosic whiskers,their properties and their application in nanocomposite field[J].Biomacromolecules,2005,6:612-626.
[5]Spagnol C,Rodrigues F H A,Pereira A G B,et al.Superabsorbent hydrogel nanocomposites based on starch-g-poly(sodium acrylate)matrix filled with cellulose nanowhiskers[J].Cellulose,2012,19:1225-1237.
[6]黄洋,孙东平.细菌纤维素晶须/聚(丙烯酸-丙烯酰胺)复合高吸水性树脂[J].高分子学报,2013(9):1183-1189.Huang Y,Sun D P.Bacterial cellulose whisker/poly(acrylic acid-coacrylamide)super-absorbent composite resins[J].Acta Polymerica Sinica,2013(9):1183-1189.
[7]刘景富,陈海洪,夏正斌,等.纳米粒子的分散机理、方法及应用进展[J].合成材料老化与应用,2010,39(2):36-40.Liu J F,Chen H H,Xia Z B,et al.Advance on the nanoparticle’s dipersion mechanism,methods and application[J].Synthetic Materials Aging and Application,2010,39(2):36-40.
[8]蒋丹烈,胡霞林,王锐,等.离子对氧化铁纳米颗粒水中聚集作用的影响[J].中国环境科学,2014,34(10):2545-2550.Jiang D L,Hu X L,Wang R,et al.Influence of ions on the aggregation behavior of hematite nanoparticle in aqueous system[J].China Environmental Science,2014,34(10):2545-2550.
[9]李本刚,曹绪芝,夏天宇,等.聚乙烯醇/改性纳米纤维素晶体纳米复合薄膜的制备及性能[J].高分子材料科学与工程,2013,29(7):152-156.Li B G,Cao X Z,Xia T Y,et al.Preparation and properties of poly(vinyl alcohol)/modified nanocrysatlline cellulose nanocomposite films[J].Polymer Materials Science&Engineering,2013,29(7):152-156.
[10]卢金华,高保娇,张国海.Ce(Ⅳ)盐引发丙烯酰胺在聚乙烯醇微球表面接枝聚合的研究[J].高分子学报,2009(6):540-545.Lu J H,Gao B J,Zhang G H.Studies on graft polymerization of acrylamide on crosslinked polyvinyl alcohol microspheres by initiating of cerium(Ⅳ)salt[J].Acta Polymerica Sinica,2009(6):540-545.
[11]Sun B,Hou Q X,Liu Z H,et al.Sodium periodate oxidation of cellulose nanocrystal and its application as a paper wet strength additive[J].Cellulose,2015,22:1135-1146.
[12]庄知博,南照东.碳纳米管复合聚丙烯酸钠的制备及吸水性能[J].应用化学,2017,34(3):282-290.Zhuang Z B,Nan Z D.Preparation and swelling properties of carbon nanotubes composited sodium polyacrylate[J].Chinese Journal of Applied Chemistry,2017,34(3):282-290.