功能化纳米二硫化钼的制备及在高分子复合材料中的应用

发布时间：2018-07-03 17:04

本文选题：功能化二硫化钼 + 可生物降解高分子复合材料　；参考：《安徽大学》2017年硕士论文

【摘要】：近几年,二硫化钼(MoS_2)由于其二维层状结构和量子尺寸效应,已逐渐引起了人们的兴趣,在光催化、复合材料制备和污染物降解等领域应用广泛。但是由于原始的二硫化钼为颗粒状,层与层之间产生的堆积作用会限制它的应用,因此需要对其改性。基于此,本文首先对块状的二硫化钼进行化学处理,利用液相剥离法制备出功能化的二硫化钼纳米片。再将其作为填料加入可生物降解高分子聚合物中,通过溶液共混法制备可生物降解高分子/功能化二硫化钼复合材料,以提高可生物降解高分子的热学性能和力学性能。论文的具体内容如下:1.采用液相剥离法制备功能化的二硫化钼(SA-MoS_2),通过超声的方法在MoS_2表面粘附大量的羟基和羧基等亲水性的官能团。这些官能团固定在MoS_2的表面,致使MoS_2层与层之间的堆积作用明显减弱。通过TEM、XRD和拉曼等测试对材料的形貌和结构进行了表征,证明MoS_2已经被剥离成片状结构且原有晶型并未改变。2.通过溶液共混法制备了海藻酸钠/功能化二硫化钼(SA/SA-MoS_2)复合材料。通过SEM、XRD和FT-IR等测试对材料的形貌和结构进行了表征。由于SA与SA-MoS_2具有良好的相容性,所成复合材料厚度均一,颜色具有规律性。通过DMTA、TGA测试,研究了 SA-MoS_2的添加量对SA/SA-MoS_2复合材料的热力学性能的影响。结果表明,随着SA-MoS_2含量的增加,SA/SA-MoS_2复合材料的储能模量先增加后减小,其中填料的含量为0.5%时,复合材料的力学性能提高的最明显。热学性能在SA-MoS_2的含量为1.0%时提高的最多。3.通过溶液共混法制备了聚乙烯醇/功能化二硫化钼(PVA/SA-MoS_2)复合材料。通过SEM、XRD和FT-IR等测试对材料的形貌和结构进行了表征。由于PVA与SA-MoS_2具有良好的相容性,所成复合材料没有出现宏观相分离的现象。通过DMTA测试,发现SA-MoS_2的加入能提高PVA复合材料的力学性能,当SA-MoS_2含量为0.2%时,复合材料的储能模量提高的最明显。通过TGA测试,发现SA-MoS_2的加入对PVA复合材料的热学性能也有一定的提高作用。4.采用液相剥离法对块状MoS_2进行剥离,用木质素(AL)作为溶剂制备出功能化的二硫化钼(AL-MoS_2)。将制得的AL-MoS_2与羧甲基纤维素(CMC)通过溶液共混法制备成复合材料,调节填料的添加量得到不同比例的羧甲基纤维素/功能化二硫化钼(CMC/AL-MoS_2)纳米复合材料。通过DMTA、TGA测试,研究了 AL-MoS_2的添加对CMC/AL-MoS_2复合材料的热力学性能的影响。结果表明,随着AL-MoS_2含量的增加,CMC/AL-MoS_2复合材料的热力学稳定性逐渐增强,在填料的含量为1.0%时达到最大值。
[Abstract]:In recent years, molybdenum disulfide (MoS _ 2) has attracted more and more attention due to its two-dimensional layered structure and quantum size effect. It has been widely used in the fields of photocatalysis, composite material preparation and pollutant degradation. However, because the original molybdenum disulfide is granular, the stacking effect between layers will limit its application, so it needs to be modified. Based on this, the bulk molybdenum disulfide was chemically treated and the functionalized molybdenum disulfide nanocrystals were prepared by liquid phase stripping method. The biodegradable polymer / functionalized molybdenum disulfide composites were prepared by solution blending in order to improve the thermal and mechanical properties of biodegradable polymers. The specific contents of the paper are as follows: 1. The functionalized molybdenum disulfide (SA-MoS _ 2) was prepared by liquid phase stripping method. A large number of hydrophilic functional groups such as hydroxyl and carboxyl groups were adhered to the surface of MoS _ 2 by ultrasonic method. These functional groups are fixed on the surface of Mos _ s _ 2, and the accumulation between the two layers is obviously weakened. The morphology and structure of the material were characterized by TEM XRD and Raman measurements. It was proved that MoS / Snap2 had been peeled into flake structure and the original crystal structure had not changed. 2. Sodium alginate / functionalized molybdenum disulfide (SA-SA-MoS2) composites were prepared by solution blending method. The morphology and structure of the materials were characterized by SEM XRD and FT-IR. Due to the good compatibility between SA and SA-MoS _ 2, the thickness of the composite is uniform and the color is regular. The effect of the addition of SA-MoS _ 2 on the thermodynamic properties of SA-MoS _ 2 composite was studied by DMTA-TGA test. The results show that with the increase of SA-MoS2 content, the energy storage modulus of SA-MoS2 / SA-MoS2 composite increases first and then decreases, and the mechanical properties of SA-MoS2 composites increase most obviously when the filler content is 0.5. The thermal properties of SA-MoS _ 2 increased as much as. 3 when the content of SA-MoS _ 2 was 1.0. Polyvinyl alcohol / functional molybdenum disulfide (PVA / SA-MoS2) composites were prepared by solution blending method. The morphology and structure of the materials were characterized by SEM XRD and FT-IR. Due to the good compatibility between PVA and SA-MoS _ 2, there is no macroscopic phase separation in the composite. Through DMTA test, it is found that the mechanical properties of PVA composites can be improved by adding SA-MoS _ 2. When the content of SA-MoS _ 2 is 0.2, the energy storage modulus of the composites increases most obviously. By TGA test, it is found that the addition of SA-MoS _ 2 can also improve the thermal properties of PVA composites. The bulk MoS _ 2 was peeled by liquid phase stripping method and the functionalized molybdenum disulfide (AL-MoS _ 2) was prepared by using lignin (AL) as solvent. AL-MoS _ 2 was prepared by solution blending with carboxymethyl cellulose (CMC). Different proportions of carboxymethyl cellulose / functionalized molybdenum disulfide (CMC / AL-MoS _ 2) nanocomposites were obtained by adjusting the content of filler. The effect of the addition of AL-MoS _ 2 on the thermodynamic properties of CMC / AL-MoS2 composite was studied by DMTA-TGA test. The results show that the thermodynamic stability of AL-MoS2 / AL-MoS2 composites increases with the increase of AL-MoS2 content, and reaches the maximum when the filler content is 1.0.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ136.12;TB383.1

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