导电功能自修复复合材料
发布时间：2018-07-15 15:18
【摘要】：自修复材料可以延长材料的使用寿命,降低生产成本,提高材料安全性。近年来成为研究的热点,导电功能自修复材料是其中一个重要的领域。虽然在这个领域内的研究工作已经取得了非常多的成就,但是仍存在着一些问题,例如许多导电自修复材料的修复过程需要在外界刺激作用下才能完成,目前还没有关于低于室温的导电自修复材料的研究报道等等。本论文中,我们采用超分子聚合物作为树脂基体,将其与碳纳米材料(包括石墨烯和碳纳米管)复合后制备出了两种新型导电功能自修复材料,并对材料的结构和性质做了深入的表征。本论文主要分为以下两个部分。1.石墨烯/超分子聚合物复合材料本工作中,我们首先利用柠檬酸与N',N',N",N"-四甲基-1,3-丙二胺之间的质子交换作用获得了超分子聚合物,并将还原后的氧化石墨烯(RGO)加入其中获得了RGO/超分子聚合物复合材料。采用广角X射线衍射、透射电子显微镜、傅立叶变化红外光谱,差示扫描量热仪,旋转粘度仪和电阻计等分析了石墨烯与复合材料的结构,复合材料的热性能、粘度-温度特性、导电性能和自修复性能。X射线衍射分析结果表明,所用石墨烯具有微米级的大尺寸；红外光谱分析表明,RGO的加入削弱了柠檬酸与四甲基丙二胺之间的静电相互作用；热分析结果表明,RGO/超分子聚合物复合材料在升降温过程中的热流减小；粘度测试结果表明,RGO使复合材料的粘度大幅下降。这些结果说明,由于RGO的大尺寸,在RGO与柠檬酸和四甲基丙二胺原位形成超分子聚合物复合材料过程中,RGO对部分柠檬酸与四甲基丙二胺起到了隔离作用,在一定程度上破坏了复合材料中超分子聚合物拟网状结构的完整性。由于RGO的高导电性以及RGO复合材料的高流动性,复合材料的电导率大幅提升了约3个数量级,且导电性随温度的跃迁变化更加显著。相比于原聚合物,复合材料的自修复效率更高。2.低温导电自修复材料本工作中,我们以柠檬酸和四甲基丙二胺为原料制备了超分子聚合物,并在其中加入了适量的碳纳米管,随即得到了能够在低于室温条件下完成自修复的导电复合材料。研究结果表明,这种超分子聚合物能够在-24℃条件下,4小时内完成自修复；在加入碳纳米管后,超分子聚合物基体的自修复性能并未受到很大影响,所得导电自修复材料同样能够在4小时内完成自修复。这种超分子聚合物及低温导电自修复材料在修复后,可以承受约1×104Pa的应力而不发生断裂。即便是断口不完全对齐的情况下,这种超分子聚合物及低温导电自修复材料也能够很好地在-24℃完成修复,并承受相同的应力作用。在结构修复的同时,材料的导电性也得以很好的修复。对这种超分子聚合物及导电修复材料的低温自修复机理研究表明,羧基与胺基间的离子键交换是主要原因。由于超分子聚合物低温导电修复材料的粘弹性和可塑性,可以在室温下将其制备成不同形状的导体,扩展了它的使用范围。
[Abstract]:Self repairing materials can prolong the service life of materials, reduce production costs and improve material safety. In recent years, it has become a hot spot of research. Self repairing materials are one of the most important fields. Although many research work has been made in this field, there are still some problems, such as many guides. In this paper, we use supramolecular polymer as a resin matrix to make two of carbon nanomaterials (including graphene and carbon nanotubes). The structure and properties of the new conductive functional self repairing materials are deeply characterized. This paper is mainly divided into two parts of the.1. graphene / supramolecular polymer composites. We first obtained the supramolecular polymerization using the proton exchange between citric acid and N', N', N "N" - four methyl -1,3- C two amines. RGO/ supermolecule polymer composite was obtained by adding the reduced graphite oxide (RGO). Wide angle X ray diffraction, transmission electron microscope, Fu Liye change infrared spectrum, differential scanning calorimeter, rotary viscosimeter and resistor meter were used to analyze the structure of the alkene and composite materials and the thermal properties of the composites. The.X ray diffraction analysis of the viscosity temperature characteristics, electrical conductivity and self repair performance showed that the graphene was of micrometer size, and the infrared spectrum analysis showed that the addition of RGO weakened the electrostatic interaction between citric acid and four methylpropyl two amine, and the results of thermal analysis showed that the RGO/ supramolecular polymer composites were rising and down. The heat flux in the temperature process decreased, and the viscosity test results showed that the viscosity of the composite decreased significantly by RGO. These results showed that, due to the large size of RGO, in the process of in situ formation of the supermolecular polymer composite with citric acid and four methylpropyl two amine in the process of RGO, some of the citric acid and four methylpropyl two amine were isolated. The integrity of the pseudo reticular structure of the supermolecular polymer in the composite is destroyed to a certain extent. The conductivity of the composite is increased by about 3 orders of magnitude due to the high conductivity of the RGO and the high mobility of the RGO composite, and the conductivity of the composites is more significant with the transition of the temperature. In the work of higher.2. low temperature conductive self repairing materials, we prepared the supramolecular polymer with citric acid and four methylamine two amine as raw material, and added a proper amount of carbon nanotubes in it, then obtained the conductive composite material that could be repaired at a lower temperature under the condition of room temperature. The results showed that the supramolecular polymer can be used. Under the condition of -24 C, self repair is completed within 4 hours. After adding carbon nanotubes, the self repair performance of the supramolecular polymer matrix has not been greatly affected. The self repairing material can also be self repairing in 4 hours. This supermolecular polymer and low temperature conductive self repair material can bear about 1 x 104P after repair. The stress of the A does not break. Even if the fracture is not fully aligned, the supramolecular polymer and the low temperature conductive self repair material can also be well repaired at -24 C and bear the same stress effect. The conductivity of the material is well repaired while the structure is repaired. The study on the self repair mechanism of the electric repair materials at low temperature shows that the ion bond exchange between the carboxyl group and the amine group is the main reason. Because of the viscoelasticity and plasticity of the supramolecular polymer, it can be prepared at room temperature into a conductor with different shapes, and the range of its use is extended.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33
本文编号：2124511
[Abstract]:Self repairing materials can prolong the service life of materials, reduce production costs and improve material safety. In recent years, it has become a hot spot of research. Self repairing materials are one of the most important fields. Although many research work has been made in this field, there are still some problems, such as many guides. In this paper, we use supramolecular polymer as a resin matrix to make two of carbon nanomaterials (including graphene and carbon nanotubes). The structure and properties of the new conductive functional self repairing materials are deeply characterized. This paper is mainly divided into two parts of the.1. graphene / supramolecular polymer composites. We first obtained the supramolecular polymerization using the proton exchange between citric acid and N', N', N "N" - four methyl -1,3- C two amines. RGO/ supermolecule polymer composite was obtained by adding the reduced graphite oxide (RGO). Wide angle X ray diffraction, transmission electron microscope, Fu Liye change infrared spectrum, differential scanning calorimeter, rotary viscosimeter and resistor meter were used to analyze the structure of the alkene and composite materials and the thermal properties of the composites. The.X ray diffraction analysis of the viscosity temperature characteristics, electrical conductivity and self repair performance showed that the graphene was of micrometer size, and the infrared spectrum analysis showed that the addition of RGO weakened the electrostatic interaction between citric acid and four methylpropyl two amine, and the results of thermal analysis showed that the RGO/ supramolecular polymer composites were rising and down. The heat flux in the temperature process decreased, and the viscosity test results showed that the viscosity of the composite decreased significantly by RGO. These results showed that, due to the large size of RGO, in the process of in situ formation of the supermolecular polymer composite with citric acid and four methylpropyl two amine in the process of RGO, some of the citric acid and four methylpropyl two amine were isolated. The integrity of the pseudo reticular structure of the supermolecular polymer in the composite is destroyed to a certain extent. The conductivity of the composite is increased by about 3 orders of magnitude due to the high conductivity of the RGO and the high mobility of the RGO composite, and the conductivity of the composites is more significant with the transition of the temperature. In the work of higher.2. low temperature conductive self repairing materials, we prepared the supramolecular polymer with citric acid and four methylamine two amine as raw material, and added a proper amount of carbon nanotubes in it, then obtained the conductive composite material that could be repaired at a lower temperature under the condition of room temperature. The results showed that the supramolecular polymer can be used. Under the condition of -24 C, self repair is completed within 4 hours. After adding carbon nanotubes, the self repair performance of the supramolecular polymer matrix has not been greatly affected. The self repairing material can also be self repairing in 4 hours. This supermolecular polymer and low temperature conductive self repair material can bear about 1 x 104P after repair. The stress of the A does not break. Even if the fracture is not fully aligned, the supramolecular polymer and the low temperature conductive self repair material can also be well repaired at -24 C and bear the same stress effect. The conductivity of the material is well repaired while the structure is repaired. The study on the self repair mechanism of the electric repair materials at low temperature shows that the ion bond exchange between the carboxyl group and the amine group is the main reason. Because of the viscoelasticity and plasticity of the supramolecular polymer, it can be prepared at room temperature into a conductor with different shapes, and the range of its use is extended.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33
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相关期刊论文 前3条
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3 白炳莲,李敏;基于氢键的自组装超分子体系[J];化学通报;2004年02期
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