Abstract

A new method is developed for the production of composite fibers based on cellulose and vinyltriethoxysilane and formed from N-methylmorpholine-N-oxide solutions. Introduction of the organosilicon additive promotes the activation of cellulose pyrolysis processes, and its choice relies on the presence of a double bond in vinyltriethoxysilane, which can be opened when the temperature rises. Mixed solutions are emulsions with labile droplets of the organosilicon liquid that easily change their shape under deformation. The study of the rheological behavior of the mixed solutions of cellulose with vinyltriethoxysilane reveals an unusual character of a change in viscosity with the concentration of vinyltriethoxysilane—with a minimum at 10–15%. From joint solutions by the dry-jet wet method, composite fibers are spun in an aqueous coagulation bath at a rate of 50–70 m/min. The study of their thermal properties shows that in thermolysis vinyltriethoxysilane additives catalyze condensation processes in cellulose and lead to an increase in char yield. Using IR spectroscopy, the combined chemical transformations of cellulose and vinyltriethoxysilane at all stages of the heat treatment of composite fibers up to 1200°C are analyzed for the first time. It is found that during thermolysis the chemical interaction of vinyltriethoxysilane with cellulose occurs and carbon fibers “crosslinked” by silicon carbide fragments are formed.

中文翻译：

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基于纤维素和乙烯基三乙氧基硅烷作为碳材料前体的复合纤维

摘要

开发了一种新方法来生产基于纤维素和乙烯基三乙氧基硅烷并由N-甲基吗啉-N形成的复合纤维-氧化物溶液。有机硅添加剂的引入促进了纤维素热解过程的活化，其选择取决于乙烯基三乙氧基硅烷中双键的存在，当温度升高时可以打开。混合溶液是带有不稳定的有机硅液体小滴的乳液，在变形时很容易改变其形状。对纤维素与乙烯基三乙氧基硅烷混合溶液的流变行为的研究表明，粘度随乙烯基三乙氧基硅烷浓度的变化而变化，具有至少10％至15％的最小值。通过干喷湿法从接缝溶液中，将复合纤维以50–70 m / min的速度在水性混凝浴中纺丝。对它们的热性能的研究表明，在热解过程中，乙烯基三乙氧基硅烷添加剂可催化纤维素中的缩合过程并导致炭收率的提高。使用红外光谱法，首次分析了复合纤维在最高1200°C热处理的所有阶段中纤维素和乙烯基三乙氧基硅烷的联合化学转化。发现在热解期间，乙烯基三乙氧基硅烷与纤维素发生化学相互作用，并且形成了由碳化硅碎片“交联”的碳纤维。