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聚合物衍生SiOC/TiC和SiOC/TiC/莫来石纳米复合材料的制备及结构评价

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-09-10 DOI:10.22068/IJMSE.2093

Amirhosein Paryab, Toktam Godary, S. Abdollahi, Mohsen Anousheh, A. M. Khachatourian

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引用次数: 1

摘要

由硅衍生的碳氧化硅（SiOC）材料因其优异的高温性能而备受关注。在本研究中，将醇盐前体与主要硅树脂前体一起使用的Si（Ti）OC和Si（Ti，Al）OC纳米复合材料与SiOC材料进行了比较。尽管在SiOC中，C在富含碳的SiOC相中与Si结合，但X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）表明，在向体系中添加Ti时，TiC是C原子的优选状态。拉曼光谱也证实了这一说法，其中向系统中添加Ti降低了D带的强度，表明C对形成结晶TiC的高亲和力。在Si（Ti）OC体系中加入AlCl3合成的Si（Ti，Al）OC纳米复合材料中，莫来石纳米晶体与TiC形成超晶格结构。纳米复合材料的紫外-可见光谱表明，与只有TiC纳米晶体的Si（Ti）OC相比，具有莫来石TiC超晶格的Si（Al）OC具有更大的带隙。

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Manufacturing and Structural Evaluation of Polymer Derived SiOC/TiC and SiOC/TiC/mullite Nanocomposites

Silicon oxycarbide (SiOC) materials derived from silicone attracted great attention for their superior high-temperature behavior. In the present study, Si (Ti)OC and Si (Ti,Al)OC nanocomposites, in which alkoxide precursors were used with the main silicone precursor, have been compared with SiOC material. Although in SiOC, C was bonded with Si in a carbon-rich SiOC phase, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) showed that TiC was the preferred state for C atoms upon adding Ti into the system. This claim was also substantiated by Raman spectroscopy, where adding Ti into the system lowered the intensity of the D band, indicating the high affinity of C to form crystalline TiC. In the Si(Ti,Al)OC nanocomposites synthesized by adding AlCl3 into the Si(Ti)OC system, mullite nanocrystals formed a superlattice structure with TiC. UV-vis spectra of the nanocomposites showed Si (Ti,Al)OC with mullite-TiC superlattice had a larger bandgap compared with Si(Ti)OC with only TiC nanocrystals.

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来源期刊

Accounts of Chemical Research

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.

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