石墨相氮化碳聚合物纳米复合材料的制备及其热稳定性研究

发布时间：2018-01-29 05:42

本文关键词： 石墨相氮化碳纳米片复合物聚乙烯醇聚苯乙烯热稳定性　出处：《东南大学》2017年硕士论文　论文类型：学位论文

【摘要】：作为大规模应用且日常生活必不可少的高分子聚合物,聚乙烯醇(PVA)和聚苯乙烯(PS)等在建筑、纺织及日常电子产品等领域有广泛的应用,然而它们的热定性不是很好。石墨相氮化碳(GPPCN)作为一种二维纳米材料可以应用于高分子聚合物材料的阻燃。但是它存在两个重要问题:(1)GPPCN在PVA、PS中分散较差;(2)GPPCN的阻燃效率低,难以使阻燃PVA、PS复合材料满足实际应用。本论文主要致力于提高GPPCN在PVA、PS中的分散和增强GPPCN/PVA、GPPCN/PS复合材料的热稳定性。论文主要包括以下两部分:1.以尿素为原料、高温煅烧得到大比表面、浅黄色的石墨相氮化碳(GPPCN)。通过GPPCN与聚乙烯醇(PVA)之间的界面相互作用得到了 GPPCN/PVA纳米复合材料。实验中通过扫描电镜、红外、紫外、X射线衍射和热分析等技术对材料的理化性质进行了详细的表征分析。实验结果表明,样品最初的热分解温度有一定的升高;样品损失50 wt%的热分解温度提高了 11.8%;样品的残炭率均比空白样品的残炭率高。这表明适当GPPCN的复合可以有效提高聚乙烯醇的热稳定性。2.通过静电相互作用将GPPCN掺到聚苯乙烯(PS)中,利用GPPCN的高热稳定性及界面作用提高聚苯乙烯的热稳定性。实验中通过扫描电镜、红外、紫外、X射线衍射和热分析等技术对材料的理化性质进行了详细的表征分析。实验结果表明虽然GPPCN与PS之间的作用不是很牢固,但样品的热分解温度均有很大提高;样品的残炭率均比空白样品的残炭率高。这表明适当GPPCN的掺入可以有效提高聚苯乙烯的热稳定性。
[Abstract]:Polyvinyl alcohol (PVA) and polystyrene polystyrene (PSPS) are widely used in the fields of architecture, textile and daily electronic products, which are widely used in large scale and daily life, such as polyvinyl alcohol (PVA) and polystyrene (PS). However, their thermal properties are not very good. Graphite phase carbon nitride GPPCNcan be used as a two-dimensional nano-material for flame retardancy of polymer materials, but it has two important problems: 1). GPPCN is in PVA. The dispersion of PS was poor; The flame retardant efficiency of GPPCN is low, so it is difficult to meet the practical application of the flame retardant PVAP-PS composite. This thesis is mainly devoted to improving the GPPCN in PVA. Dispersion and enhancement of the thermal stability of GPPCN-PVAP-GPPCNPS composites in PS. This paper mainly includes the following two parts: 1. Using urea as raw material, high temperature calcination to obtain large specific surface. Light yellow graphite phase carbon nitride GPPCN. by means of GPPCN and polyvinyl alcohol (PVA). GPPCN/PVA nanocomposites were obtained by interfacial interaction. The physicochemical properties of the samples were characterized by IR, UV X ray diffraction and thermal analysis. The experimental results showed that the initial thermal decomposition temperature of the samples increased to a certain extent. The pyrolysis temperature of the sample lost 50 wt% was increased by 11.8wt%. The carbon residue rate of the sample is higher than that of the blank sample, which indicates that the proper GPPCN composite can effectively improve the thermal stability of PVA. The GPPCN is doped into polystyrene by electrostatic interaction. PS2. The high thermal stability and interfacial interaction of GPPCN were used to improve the thermal stability of polystyrene. The physicochemical properties of the materials were characterized by X-ray diffraction and thermal analysis. The experimental results showed that the interaction between GPPCN and PS was not very strong. However, the thermal decomposition temperature of the samples has been greatly improved. The carbon residue rate of the sample is higher than that of the blank sample, which indicates that the proper addition of GPPCN can effectively improve the thermal stability of polystyrene.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB332

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