用原子力显微镜研究炭黑表面活性

发布时间：2018-05-21 01:10

  本文选题：原子力显微镜 + 炭黑聚集体　； 参考：《四川理工学院》2015年硕士论文

【摘要】：高结构炭黑由于其结构的复杂性与表面的活性位点,使其在补强性能上比普通炭黑有更优异的性能。本论文对高结构炭黑表面结构及活性位点开展研究工作,以达到深入认识炭黑补强机理及提高和改善炭黑的补强性能的目的,促进炭黑在“绿色轮胎”上的开发与应用。(1)本文采用原子力显微镜DFM模式对高结构炭黑和普通炭黑进行了形貌结构表征和相图分析。结果表明:高结构炭黑结构更为复杂,呈交联网状结构及葡萄串状结构,尤其是CRX2125、CRX1380及DZ13具有孔洞结构,CRX1380还具有片层状结构,这些独特的形貌结构是首次被扫描出来;而普通炭黑N660呈球形和椭球形状。DFM相图反映了炭黑聚集体边缘处的结构,是形貌图的一个重要补充。结果表明:炭黑聚集体边缘处的颜色较聚集体中间部分更为明亮,显示出各类炭黑聚集体边缘处呈一定的粘弹性,偏软。(2)采用原子力显微镜DFM模式对经不同温度和氧气处理的炭黑聚集体表面做力曲线,做大量统计并分析。结果表明:在常温常压下,高结构炭黑CRX1380、CRX2125、N234表现出了很小的活性,而炭黑DZ13、N115和普通炭黑没有表现出活性;经过高温有氧处理后,炭黑表现出活性,且活性点的几率大幅度提高;在超高温真空下处理后的炭黑,只有高结构炭黑CRX1380、CRX2125、DZ13表现出活性。(3)元素分析表明炭黑经高温有氧处理后,炭黑聚集体表面百分含氧量显著增加,由DFM力曲线统计结果可知,炭黑聚集体含氧量增加,其表面活性点出现的几率也增加。经1350℃处理后的炭黑聚集体表面含氧量急剧下降,高结构炭黑N234、N115和普通炭黑N660的力曲线没有发生变化,即探针针尖没有探测到活性点,而在高结构炭黑CRX2125、CRX1380、DZ13表面上探测到了活性点。高结构炭黑表面活性点主要由炭黑表面含氧官能团和自身结构决定,普通炭黑表面活性点主要由表面含氧官能团决定;炭黑表面活性点主要分布于炭黑聚集体边缘处,即活性点区域主要集中于炭黑聚集体的边缘处,与炭黑边缘呈粘弹性有关。
[Abstract]:Because of the complexity of the structure and the active site of the surface, the high structure carbon black has better reinforcing performance than the common carbon black. In this paper, the surface structure and active sites of high structure carbon black were studied in order to understand the reinforcing mechanism of carbon black and improve the reinforcing performance of carbon black. To promote the development and application of carbon black on "Green Tire". (1) in this paper, the morphology and structure of high structure carbon black and ordinary carbon black were characterized by atomic force microscope (AFM) DFM model and their phase diagrams were analyzed. The results show that the structure of high structure carbon black is more complex, with cross-linked network structure and grape string structure, especially CRX2125 CRX1380 and DZ13 have pore structure, CRX1380 and lamellar structure. These unique morphological structures are scanned for the first time. The phase diagram of N660 is spherical and ellipsoidal. DFM phase diagram reflects the structure at the edge of carbon black aggregate, which is an important supplement to the morphology diagram. The results show that the color of the edge of carbon black aggregate is brighter than that of the middle part of the aggregate, which shows that the edge of all kinds of carbon black aggregates is viscoelastic. The surface force curves of carbon black aggregates treated with different temperatures and oxygen were analyzed by atomic force microscope (AFM) DFM model. The results show that the high structure carbon black CRX1380 CRX2125N234 exhibits very little activity at room temperature and atmospheric pressure, while the carbon black DZ13N115 and common carbon black show no activity, and after high temperature aerobic treatment, the carbon black exhibits activity, and the probability of active point increases greatly. Only high structure carbon black (CRX1380, CRX2125DZ13) showed active element analysis after treatment in ultra-high temperature vacuum. The results showed that the oxygen content of carbon black aggregates increased significantly after aerobic treatment at high temperature, which can be seen from the statistical results of DFM force curve. With the increase of oxygen content in carbon black aggregates, the probability of appearance of surface active point is also increased. After treatment at 1350 鈩，

本文编号：1917057