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Preparation and thermal-mechanical property evaluation of cellulose insulation paper with differing nano-SiC contents
High Voltage ( IF 4.4 ) Pub Date : 2022-11-01 , DOI: 10.1049/hve2.12271
Yiyi Zhang 1, 2 , Chuqi Xu 1 , Wenchang Wei 1 , Yuke Deng 1 , Shuangxi Nie 3 , Junwei Zha 4
Affiliation  

Cellulose insulation paper is the main component of oil-paper insulation systems in oil-immersed transformers. However, the poor thermal conductivity and thermal stability of the cellulose can lead to thermal ageing. It is critical to address this issue by improving the performance of cellulose, nano-SiC-modified cellulose models were established by molecular simulation, while nano-SiC composite papersheets were prepared based on the simulation results, and the effects of different contents of nano-SiC on the papersheets were investigated. Macroscopically, doping nano-SiC particles can enhance the thermal stability of cellulose; compared with the unmodified papersheet, the thermal conductivity and tensile strength of the modified papersheets are increased by 44.3% and 42.8%, respectively. The degree of polymerisation of the modified papersheet decreased more slowly than that of the unmodified papersheet under accelerated thermal ageing, showing that the modified papersheet has better anti-ageing properties. Microscopically, with the addition of nano-SiC, the simulations showed that the mean square displacement of the cellulose decreases dramatically and the distribution of the free volume becomes difficult to disperse, which corresponds to the decrease in porosity in the experiments. As a result, this research provides a way for improving the thermal-mechanical properties of cellulose that has practical application significance.

中文翻译:

不同纳米SiC含量纤维素绝缘纸的制备及热机械性能评价

纤维素绝缘纸是油浸式变压器油纸绝缘系统的主要组成部分。然而,纤维素较差的导热性和热稳定性会导致热老化。解决这一问题的关键是提高纤维素的性能,通过分子模拟建立纳米SiC改性纤维素模型,并根据模拟结果制备纳米SiC复合纸片,并研究不同纳米SiC含量的影响。对纸张上的 SiC 进行了研究。宏观上,掺杂纳米SiC颗粒可以增强纤维素的热稳定性;与未改性纸张相比,改性纸张的导热率和拉伸强度分别提高了44.3%和42.8%。在加速热老化下,改性纸张的聚合度下降得比未改性纸张更慢,表明改性纸张具有更好的抗老化性能。微观上,随着纳米SiC的添加,模拟显示纤维素的均方位移急剧下降,自由体积的分布变得难以分散,这对应于实验中孔隙率的下降。因此,本研究为提高纤维素的热机械性能提供了一条具有实际应用意义的途径。模拟结果表明,随着纳米SiC的加入,纤维素的均方位移急剧下降,自由体积的分布变得难以分散,这对应于实验中孔隙率的下降。因此,本研究为提高纤维素的热机械性能提供了一条具有实际应用意义的途径。模拟结果表明,随着纳米SiC的加入,纤维素的均方位移急剧下降,自由体积的分布变得难以分散,这对应于实验中孔隙率的下降。因此,本研究为提高纤维素的热机械性能提供了一条具有实际应用意义的途径。
更新日期:2022-11-01
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