无机纳米粒子增韧水凝胶复合物的制备

发布时间：2018-01-13 17:18

本文关键词：无机纳米粒子增韧水凝胶复合物的制备　出处：《长春工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：水凝胶是通过高分子链之间交联形成的聚合物,内部能够储存很多的水而膨胀,并能维持原来的交联状态不溶解。同时,水凝胶是很好的软材料,在很多方面都有较大应用潜能,例如,组织工程、药物控释、生物电极、催化反应等。传统水凝胶通常是高分子链和化学交联剂(BIS)形成的三维网络,当发生形变时刚性化学键容易断裂,承受外力的能力较差,因而限制其在力学需求方面的应用。无机纳米粒子表现出很多特异性,凝胶网络中加入纳米粒子能增强水凝胶力学行为和赋予水凝胶其他性能。通过控制各组分加入量,探索加入无机纳米粒子对凝胶各种行为的影响。本文选用粘土Laponite和丙烯酰胺单体(AAm)制备Laponite/PAAm复合水凝胶。以纳米二氧化钛(P25)及疏水基团为交联剂和丙烯酰胺单体制备二氧化钛/丙烯酰胺疏水基团共聚(TiO_2/P(AAm-HMA))水凝胶。通过溶胀实验研究Laponite/PAAm复合水凝胶溶胀问题;通过拉伸实验研究无机材料和疏水基团共同对水凝胶的增韧机理。1.以纳米粘土(laponite)和N,N-亚甲基双丙烯酰胺(BIS)为交联剂,丙烯酰胺(AAm)为单体,通过热引发合成一系列均匀的粘土/聚丙烯酰胺(laponite/PAAm)复合水凝胶。通过溶胀实验研究不同含量粘土、N,N-亚甲基双丙烯酰胺、AAm对Laponite/PAAm复合水凝胶溶胀行为影响和溶胀动力学问题。2.以纳米二氧化钛(P25)、疏水基团(HMA)共同作为交联剂,丙烯酰胺(AAm)为单体,用紫外光引发制备二氧化钛/丙烯酰胺疏水基团共聚(TiO_2/P(AAm-HMA))水凝胶。通过红外、热重和透射电镜对表面修饰的二氧化钛进行表征。对二氧化钛/丙烯酰胺疏水基团共聚(TiO_2/P(AAm-HMA))水凝胶力学性能进行测试,研究不同含量二氧化钛和疏水基团对纳米复合水凝胶力学性能影响。本文成功制备了纳米粘土/聚丙烯酰胺(laponite/PAAm)复合水凝胶和二氧化钛/丙烯酰胺疏水基团共聚(TiO_2/P(AAm-HMA))水凝胶。溶胀实验表明,纳米粘土粒子对水凝胶的溶胀有较大影响。用甲基丙烯酸三甲氧基硅烷对二氧化钛表面进行改性,使二氧化钛具有引发剂和交联剂的双重功能,而体系不用加入其他交联剂。通过力学性能测试表明,加入二氧化钛和疏水基团能够显著增加水凝胶的力学性能。
[Abstract]:Hydrogel is a kind of polymer formed by crosslinking between polymer chains. It can store a lot of water and expand inside, and it can keep the original crosslinking state insoluble. At the same time, hydrogel is a good soft material. There are many potential applications, such as tissue engineering, controlled drug release, biological electrodes, catalytic reactions, etc. Traditional hydrogels are usually three-dimensional networks formed by polymer chains and chemical crosslinker BISs. When deformation occurs, rigid chemical bonds are easy to break and the ability to bear external forces is poor, which limits their application in mechanical requirements. Inorganic nanoparticles show many specialties. The addition of nano-particles into the gel network can enhance the hydrogel mechanical behavior and give other properties to the hydrogel. The effects of inorganic nanoparticles on the gel behavior were investigated. Clay Laponite and acrylamide monomer Aam were used in this paper. Laponite/PAAm composite hydrogels were prepared. TIO _ 2 / acrylamide hydrophobic group copolymerization was prepared using nano-TiO _ 2 P25) and hydrophobic group as crosslinking agent and acrylamide monomer. The swelling problem of Laponite/PAAm composite hydrogels was studied by swelling experiment. The toughening mechanism of hydrogel by inorganic materials and hydrophobic groups was studied by tensile test. 1. Nano-clay and N- N- methylene bisacrylamide (BIS) were used as crosslinkers. A series of homogeneous clay / polyacrylamide laponite / pam composite hydrogels were synthesized by thermal initiation of acrylamide (Aam) as monomer, and different contents of clay were studied by swelling experiment. Effects of N- N- methylene bisacrylamide Aam on swelling behavior and swelling kinetics of Laponite/PAAm composite hydrogels. Hydrophobic group (HMA) was used as crosslinking agent and acrylamide (Aam) as monomer. TIO _ 2 / acrylamide hydrophobic group copolymerization of TIO _ 2 / acrylamide hydrophobic group was prepared by UV irradiation. The surface modified titanium dioxide was characterized by thermogravimetry and transmission electron microscopy. The mechanical properties of TIO _ 2 / acrylamide hydrophobic group copolymerization of TIO _ 2 / AAm-HMA-O _ 2 were measured. The effects of different contents of titanium dioxide and hydrophobic groups on the mechanical properties of nanocomposite hydrogels were studied. Composite hydrogels and TIO _ 2 / acrylamide hydrophobic group copolymerized with tio _ s _ (2 / P) A _ (Am-HMAN) hydrogels. Swelling test. Nano-clay particles have great influence on the swelling of hydrogel. The surface of titanium dioxide is modified by trimethoxysilane methacrylate to make titanium dioxide have the dual functions of initiator and crosslinking agent. The addition of titanium dioxide and hydrophobic group can significantly increase the mechanical properties of hydrogel.
【学位授予单位】：长春工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ427.26;TB332

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