Application of Organosilicon Modifier Based on Tetraethoxysilane for the Production of Heat-Resistant Chrysotile Fibers and Reinforced Cement Composites

IF 4 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Fibers Pub Date : 2023-09-22 DOI:10.3390/fib11100080
Roman Nikolaevich Yastrebinsky, Vyacheslav Ivanovich Pavlenko, Anna Viktorovna Yastrebinskaya, Andrey Ivanovich Gorodov, Anastasia Vladislavovna Akimenko
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引用次数: 0

Abstract

This research is aimed at obtaining boron-containing nanotubular chrysotile fibers with increased neutron absorption capacity. The possibility of using an organosilicon modifier based on tetraethoxysilane to increase the hydrothermal stability of chrysotile, as well as the strength of nanoreinforced composites based on a cement binder is considered. The mechanisms for the synthesis of heat-resistant nanotubular fibers of the composition Mg6(OH)8SiB4O10, which have a chrysotile structure, have been established. To increase the hydrothermal stability of chrysotile, crystalline hydrate phases were localized inside nanotubes using amorphous silica formed as a result of hydrolysis of silicon alkoxide under hydrothermal conditions in an alkaline environment. The modification of chrysotile via amorphous silica increases its hydrothermal stability by 97 °C. It is shown that the introduction of an organosilicon modifier based on tetraethoxysilane into the composition of Portland cement composite material leads to an increase in the structural strength and density of the composite due to the activation of silicate formation processes in the cement matrix, especially under hydrothermal conditions. The experiments showed that the strength of silicon alkoxide-modified samples of composite material increased by 34%.
基于四乙氧基硅烷的有机硅改性剂在耐热温石棉纤维和增强水泥复合材料中的应用
本研究的目的是获得具有提高中子吸收能力的含硼纳米管温石棉纤维。考虑了使用基于四乙氧基硅烷的有机硅改性剂来提高温石棉的水热稳定性以及基于水泥粘结剂的纳米增强复合材料的强度的可能性。建立了具有温石棉结构的Mg6(OH)8SiB4O10型耐热纳米管纤维的合成机理。为了提高温石棉的水热稳定性,利用碱环境下水热条件下醇氧硅水解形成的无定形二氧化硅,将晶体水合相定位在纳米管内。用无定形二氧化硅对温石棉进行改性,使其水热稳定性提高了97℃。结果表明,在硅酸盐水泥复合材料的组成中引入基于四乙氧基硅烷的有机硅改性剂,由于水泥基体中的硅酸盐形成过程被激活,特别是在水热条件下,导致复合材料的结构强度和密度增加。实验表明,经烷氧硅改性后的复合材料样品强度提高了34%。
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来源期刊
Fibers
Fibers Engineering-Civil and Structural Engineering
CiteScore
7.00
自引率
7.70%
发文量
92
审稿时长
11 weeks
期刊介绍: Fibers (ISSN 2079-6439) is a peer-reviewed scientific journal that publishes original articles, critical reviews, research notes and short communications on the materials science and all other empirical and theoretical studies of fibers, providing a forum for integrating fiber research across many disciplines. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files or software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. The following topics are relevant and within the scope of this journal: -textile fibers -natural fibers and biological microfibrils -metallic fibers -optic fibers -carbon fibers -silicon carbide fibers -fiberglass -mineral fibers -cellulose fibers -polymer fibers -microfibers, nanofibers and nanotubes -new processing methods for fibers -chemistry of fiber materials -physical properties of fibers -exposure to and toxicology of fibers -biokinetics of fibers -the diversity of fiber origins
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