二氧化硅/阳离子聚丙烯酰胺杂化材料的制备与性能研究
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摘要
以乙烯基三乙氧基硅烷为原料,采用溶胶-凝胶法制备粒径均一的乙烯基SiO_2杂化硅球(Vinyl-SiO_2),并与丙烯酰胺、阳离子单体发生原位聚合,成功制备出树枝状SiO_2/CPAM无机-有机杂化材料。通过扫描电镜和透射电镜表征杂化材料的微观形态结构;热重分析证实其多级分解,差示扫描量热仪测定出玻璃化转变温度为167.06℃。通过对杂化材料的特性黏数和Ca~(2+)吸附量分析,得出以下优化条件:当Vinyl-SiO_2用量为0.5%,阳离子单体用量为17.5%以及引发剂用量为0.6%时,SiO_2/CPAM的特性黏数为159.2 mL·g~(-1),Ca~(2+)吸附量为4.3 mmol·g~(-1)。
Dendritic inorganic-organic hybrid materials silica/cationic polyacrylamide(SiO_2/CAPM) were successfully prepared by in-situ polymerization using acrylamide, cationic monomer and hybrid silica spheres containing vinyl group with a uniform size, which were synthesized using vinyltriethoxysilane via sol-gel process. The micromorphology and structure of SiO_2/CAPM were characterized by scanning electron microscopy(SEM) and transmission electron microscopy(TEM); multistage decomposition was confirmed by thermogravimetry, and the glass transition temperature of 167.06℃ was determined by differential scanning calorimetry. Based on the analysis of intrinsic viscosity and adsorption amount of Ca~(2+) of SiO_2/CAPM, the following optimization conditions were obtained: the intrinsic viscosity of SiO_2/CAPM was 159.2 mL·g~(-1) and the adsorption amount of Ca~(2+) was 4.3 mmol·g~(-1), when the dosage of Vinyl-SiO_2, cationic monomer and the initiator was 0.5%, 17.5% and 0.6%, respectively.
Dendritic inorganic-organic hybrid materials silica/cationic polyacrylamide(SiO_2/CAPM) were successfully prepared by in-situ polymerization using acrylamide, cationic monomer and hybrid silica spheres containing vinyl group with a uniform size, which were synthesized using vinyltriethoxysilane via sol-gel process. The micromorphology and structure of SiO_2/CAPM were characterized by scanning electron microscopy(SEM) and transmission electron microscopy(TEM); multistage decomposition was confirmed by thermogravimetry, and the glass transition temperature of 167.06℃ was determined by differential scanning calorimetry. Based on the analysis of intrinsic viscosity and adsorption amount of Ca~(2+) of SiO_2/CAPM, the following optimization conditions were obtained: the intrinsic viscosity of SiO_2/CAPM was 159.2 mL·g~(-1) and the adsorption amount of Ca~(2+) was 4.3 mmol·g~(-1), when the dosage of Vinyl-SiO_2, cationic monomer and the initiator was 0.5%, 17.5% and 0.6%, respectively.
引文
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[3]RAMADAN H, GHANEM A, EL-RASSY H. Mercury removal from aqueous solutions using silica, polyacrylamide and hybrid silica-polyacrylamide aerogels[J]. Chemical Engineering Journal, 2010, 159(1/2/3): 107-115.
[4]HU X, KE Y, ZHAO Y, et al. Synthesis and characterization of a β-cyclodextrin modified polyacrylamide and its rheological properties by hybriding with silica nanoparticles[J]. Colloids and Surfaces A, 2018, 548: 10-18.
[5]李云龙, 欧阳娜, 林松柏, 等. PAM/SiO2磺甲基化改性及吸附重金属离子研究[J]. 化工新型材料, 2012, 40(2): 95-97.
[6]KUMAR R, JAIN S K, VERMA S, et al. Mercapto functionalized silica entrapped polyacrylamide hydrogel: arsenic adsorption behavior from aqueous solution[J]. Journal of Colloid and Interface Science, 2015, 456: 241-245.
[7]DENG T S, ZHANG Q F, ZHANG Y Y, et al.One-step synthesis of highly monodisperse hybrid silica spheres in aqueous solution [J]. Journal of Colloid and Interface Science, 2009, 329(2): 292-299.
[8]陈辉, 强颖怀, 尹慧. 凹凸棒土/聚丙烯酰胺杂化絮凝剂的合成及其絮凝特性研究[J]. 非金属矿, 2011, 34(2): 36-39.
[9]孙旋,戴红旗,钱慧文,等.两性电解质P(DMDAAC-AM-AA)处理造纸白水中Ca2+的研究[J]. 林产化学与工业, 2014, 34(4): 51-58.
[10]RANGELOVA N, RADEV L, NENKOVA S, et al. Methylcellulose/SiO2 hybrids: sol-gel preparation and characterization by XRD, FT-IR and AFM [J]. Central European Journal of Chemistry, 2011, 9(1):112-118.
[11]LI S, WANG F, DAI H, et al., Self-assembly of silica nanoparticles into hollow spheres via a microwave-assisted aerosol process[J]. Materials Research Bulletin, 2016,74: 459-464.
[12]赵洪波, 李琦, 魏朝巧, 等. 聚丙烯酰胺的合成及性能[J]. 合成树脂及塑料, 2010, 27(6): 25-29.
[13]BHARDWAJ P, SINGH V, MANDAL U K, et al. Polyacrylamide and poly(acrylamide-co-2-acrylamido-2-methyl-1-propanesulfonic acid)-silica composite nanogels through in situ microemulsion polymerization [J]. Journal of Materials Science, 2010, 45(4): 1008-1016.
[14]KRUSIC M K, DZUNUZOVIC E, TRIFUNOVIC S, et al. Polyacrylamide and poly(itaconic acid) complexes [J]. European Polymer Journal, 2004, 40(4): 793-798.
[15]DYKE J D V, KASPERSKI K L. Thermogravimetric study of polyacrylamide with evolved gas analysis [J]. Journal of Polymer Science: Part A Polymer Chemistry, 1993, 31(7): 1807-1823.
[16]杨艳. 凹凸棒的表面改性及其聚合物复合絮凝剂、助凝剂的合成及应用研究[D]. 兰州:兰州大学, 2007.
[17]王薇. AM/DAC的反相乳液聚合及絮凝性能评价[D]. 重庆:重庆大学, 2010.
[18]叶春洪. ACS对造纸湿部系统钙离子络合作用及机理研究[D]. 南京:南京林业大学, 2008.