碳纳米管橡胶复合材料的界面作用及分散机理研究

发布时间：2018-05-14 05:08

本文选题：碳纳米管 + 天然橡胶　；参考：《北京化工大学》2015年硕士论文

【摘要】：碳纳米管因其具优异的导电、导热性能同时兼具出色的物理机械性能,因此成为了理想的填充补强材料。在碳纳米管成为理想填充材料的同时也掀起了研究碳纳米管与橡胶界面热潮,但是关于界面的研究至今没有得出统一定论。一方面为了更全面更科学的研究碳纳米管与天然橡胶界面作用,另一方面探索碳纳米管与天然橡胶作用的影响因素,我们进行了以下四方面研究：1.研究了F9000碳纳米管与天然橡胶之间的相互作用。结果发现,添加5份F9000碳纳米管时结合胶的含量与添加50份炭黑N330的一样,并且结合胶都是由松散结合和紧密结合构成。低场核磁说明在结合胶中橡胶分子链活动受限,而紧密结合胶中的分子链活动受限程度高于松散结合胶。对于结合胶的SEM表征中也发现在碳纳米管表面包覆有厚度约13nm的橡胶层,经过抽提后该层橡胶厚度减少至8nm。进一步通过红外光谱和Raman光谱的研究显示NR分子与F9000碳管之间存在CH-π相互作用。2.通过HR-TEM、Raman和XPS对F9000碳纳米管进行分析。研究表明F9000碳纳米管含有较多的缺陷结构,碳纳米管壁上存在大量石墨结晶的断层、错层结构。XPS分析表明F9000碳纳米管表面的O1s含量约4%,主要是OH基团。据此提出了F9000与橡胶之间的三种作用机理：(a)NR大分子与碳纳米管壁表面错层、断层缺陷间的拓扑受限作用；(2)NR大分子与碳纳米管表面含氧基团的反应形成化学吸附；(3)NR大分子链在碳纳米管上缠绕。3.研究了碳纳米管的结构参数与界面结合强度(结合胶)之间的关系。结果发现：碳纳米管的ID/IG越高,其与NR形成的结合胶含量越高,即石墨上缺陷越多,界面结合强度越高；NR/MWNTs复合材料的定伸强度与碳纳米管的ID/IG基本成线性关系.4.选取F7000、F9000和GM3三种碳纳米管加入橡胶中,研究了碳纳米管用量与力学、体积电阻率和导热率的关系。在同样填充量时,表面缺陷较多的F7000碳纳米管束对于橡胶增强最好,力学、导电性和导热性性能最好,F9000次之,表面缺陷少的GM3最差。
[Abstract]:Carbon nanotubes (CNTs) have become an ideal filling and reinforcing material because of their excellent conductivity, thermal conductivity and excellent physical and mechanical properties. Carbon nanotubes (CNTs) have become the ideal filling materials, but the research on the interface between CNTs and rubber has not reached a unified conclusion. On the one hand, in order to study the interaction between CNTs and natural rubber more comprehensively and scientifically, on the other hand, we studied the following four aspects: 1. The interaction between F 9000 carbon nanotubes and natural rubber was studied. The results showed that the content of binding adhesive with 5 phr F9000 carbon nanotubes was the same as that with 50 phr carbon black N330, and the binding adhesive was composed of loose and compact bonding. The low field NMR shows that the molecular chain activity of rubber is limited in the binding adhesive, but the restriction degree of the molecular chain activity in the tight binding adhesive is higher than that in the loose binding adhesive. For the SEM characterization of the adhesive, it was also found that the rubber layer with a thickness of about 13nm was coated on the surface of the CNTs, and the thickness of the rubber layer was reduced to 8 nm after extraction. The results of IR and Raman spectra showed that there was CH- 蟺 interaction between NR molecule and F9000 carbon tube. F9000 carbon nanotubes were analyzed by HR-TEMN Raman and XPS. The results show that F9000 carbon nanotubes contain many defective structures, and there are a lot of graphite crystal faults on the carbon nanotubes wall. XPS analysis shows that the O1s content on the surface of F9000 carbon nanotubes is about 4%, mainly OH group. Based on this, three mechanisms of interaction between F9000 and rubber were proposed. The surface staggered layer of NR macromolecule and carbon nanotube wall was proposed. Topological confinement effect between fault defects the reaction of Na-2NR macromolecules with oxygen-containing groups on the surface of carbon nanotubes (CNTs) resulted in the formation of chemisorbed nitrile-containing macromolecular chains entwined on carbon nanotubes (CNTs) .3. The relationship between the structural parameters of carbon nanotubes (CNTs) and the interfacial bonding strength (adhesive) was studied. The results show that the higher the ID/IG content of CNTs is, the higher the binding adhesive content between CNTs and NR is, that is, the higher the defects on graphite, the higher the interfacial bonding strength of CNTs / MWNTs composites, and the linear relationship between the tensile strength of CNTs and the ID/IG of CNTs. Three kinds of carbon nanotubes (F7000F9000 and GM3) were added to the rubber to study the relationship between the content of CNTs and mechanics, volume resistivity and thermal conductivity. At the same filling amount, the F7000 carbon nanotube bundle with more surface defects is the best for rubber reinforcement, the mechanical, electrical and thermal conductivity is the best than F9000, and the GM3 with less surface defects is the worst.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332;TQ332

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