水性石墨烯及其聚氨酯复合材料的制备与性能研究
发布时间：2018-08-06 09:02
【摘要】：本论文主要以改善石墨烯的水溶性,使石墨烯能均匀分散在水性聚氨酯中,从而提高聚氨酯材料的性能。通过将石墨烯进行功能化,然后制备出不同类型和不同粒径的聚氨酯,采用溶液混合法制备出不同石墨烯含量的聚氨酯/石墨烯复合材料,并通过红外、XRD、透射电镜等手段对它们的结构和性能进行测试和分析。主要内容如下:(1)利用聚氧乙烯-聚二甲基硅氧烷嵌段共聚物(PEG-b-PDMS-b-PEG,以下简称PEPS)对氧化石墨烯进行表面修饰,然后用水合肼还原制备了一种水可分散的功能化石墨烯。通过对功能化石墨烯(FGNs)进行微观结构分析,发现FGNs均匀稳定地分散在水中,阻止了石墨烯的堆积。研究了 GO的pH值对氧化石墨烯体系稳定性的影响。发现GO的pH在9.0左右时可得到稳定分散的体系。(2)制备了两种粒径的阴离子聚氨酯,其中粒径大的阴离子聚氨酯和FGNs混合后发生了明显地团聚沉淀,将细粒径阴离子聚氨酯(AWPU)与功能化石墨烯混合制备了 AWPU/FGNs复合体系,通过XRD、TEM等结构和形貌分析发现片状石墨烯在AWPU胶束中均匀分散。TG、DSC等分析发现AWPU/FGNs的耐热、氧气阻隔性能明显提高。当FGNs的含量为2.0wt%时,AWPU/FGNs的峰值热释放速率相比于纯AWPU降低了 33.4%。(3)将阳离子聚氨酯(CWPU)与功能化石墨烯混合制备了 CWPU/FGNs复合体系,研究发现FGNs与CWPU之间有静电相互作用,因此FGNs能更好地分散在CWPU基体中。TEM和SEM的形貌分析发现,FGNs与CWPU具有很好的相容性。导电率测试结果表明,CWPU/FGNs的导电率比纯的CWPU显著提高。通过TG、DSC等测试,结果表明,CWPU/FGNs的耐热性、力学和氧气阻隔率显著提高。
[Abstract]:In order to improve the water solubility of graphene, graphene can be uniformly dispersed in waterborne polyurethane, so as to improve the properties of polyurethane materials. Through the functionalization of graphene, different types of polyurethane with different particle sizes were prepared, and polyurethane / graphene composites with different graphene content were prepared by solution mixing method. Their structures and properties were tested and analyzed by means of IR XRD and TEM. The main contents are as follows: (1) the surface modification of graphene oxide was carried out by using PEG-b-PDMS-b-PEG (hereinafter referred to as PEPS), and then a water-dispersible graphene was prepared by hydrazine hydrate reduction. By analyzing the microstructure of functionalized graphene (FGNs), it is found that FGNs is uniformly and stably dispersed in water, which prevents the accumulation of graphene. The effect of go pH value on the stability of graphene oxide system was studied. It was found that stable dispersion system could be obtained when pH value of go was about 9.0. (2) two kinds of anionic polyurethane with large particle size were prepared and agglomerated and precipitated obviously after mixing of anionic polyurethane with large particle size and FGNs. The AWPU/FGNs composite system was prepared by mixing fine particle size anionic polyurethane (AWPU) with functionalized graphene. The structure and morphology analysis of AWPU/FGNs showed that flake graphene was uniformly dispersed in AWPU micelle. TG-DSC analysis showed that the heat resistance of AWPU/FGNs was found. The oxygen barrier performance is improved obviously. When the content of FGNs is 2.0 wt%, the peak heat release rate of Ampu / FGNs is 33.4% lower than that of pure AWPU. (3) Cationic polyurethane (CWPU) and functionalized graphene are mixed to prepare CWPU/FGNs composite system. It is found that there is electrostatic interaction between FGNs and CWPU. Therefore, FGNs can be better dispersed in CWPU matrix. Tem and SEM morphology analysis show that FGNs and CWPU have good compatibility. The conductivity test results show that the conductivity of CWU / FGNs is significantly higher than that of pure CWPU. The results showed that the heat resistance, mechanical properties and oxygen barrier rate of CWPU- / FGNs were significantly improved by TGG-DSC.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ127.11;TB332
本文编号：2167214
[Abstract]:In order to improve the water solubility of graphene, graphene can be uniformly dispersed in waterborne polyurethane, so as to improve the properties of polyurethane materials. Through the functionalization of graphene, different types of polyurethane with different particle sizes were prepared, and polyurethane / graphene composites with different graphene content were prepared by solution mixing method. Their structures and properties were tested and analyzed by means of IR XRD and TEM. The main contents are as follows: (1) the surface modification of graphene oxide was carried out by using PEG-b-PDMS-b-PEG (hereinafter referred to as PEPS), and then a water-dispersible graphene was prepared by hydrazine hydrate reduction. By analyzing the microstructure of functionalized graphene (FGNs), it is found that FGNs is uniformly and stably dispersed in water, which prevents the accumulation of graphene. The effect of go pH value on the stability of graphene oxide system was studied. It was found that stable dispersion system could be obtained when pH value of go was about 9.0. (2) two kinds of anionic polyurethane with large particle size were prepared and agglomerated and precipitated obviously after mixing of anionic polyurethane with large particle size and FGNs. The AWPU/FGNs composite system was prepared by mixing fine particle size anionic polyurethane (AWPU) with functionalized graphene. The structure and morphology analysis of AWPU/FGNs showed that flake graphene was uniformly dispersed in AWPU micelle. TG-DSC analysis showed that the heat resistance of AWPU/FGNs was found. The oxygen barrier performance is improved obviously. When the content of FGNs is 2.0 wt%, the peak heat release rate of Ampu / FGNs is 33.4% lower than that of pure AWPU. (3) Cationic polyurethane (CWPU) and functionalized graphene are mixed to prepare CWPU/FGNs composite system. It is found that there is electrostatic interaction between FGNs and CWPU. Therefore, FGNs can be better dispersed in CWPU matrix. Tem and SEM morphology analysis show that FGNs and CWPU have good compatibility. The conductivity test results show that the conductivity of CWU / FGNs is significantly higher than that of pure CWPU. The results showed that the heat resistance, mechanical properties and oxygen barrier rate of CWPU- / FGNs were significantly improved by TGG-DSC.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ127.11;TB332
【参考文献】
相关期刊论文 前2条
1 张思维;赵文誉;李长;郑玉婴;樊志敏;;功能氧化石墨烯纳米带/热塑性聚氨酯复合材料薄膜的制备及阻隔性能[J];高分子材料科学与工程;2016年01期
2 马文石;周俊文;;一种可分散性石墨烯的制备[J];高等学校化学学报;2010年10期
，本文编号：2167214
本文链接：https://www.wllwen.com/kejilunwen/huagong/2167214.html
