The development of new materials for use in advanced distribution transformers is required to improve their heat resistance rating, operational safety, and reliability. The combination of polymer and nanoparticles is the preferred approach to improve the thermal stability of materials. In this study, the thermal stability of laboratory-prepared meta-aramid insulation paper modified with polyphenylsilsesquioxane (PPSQ) was evaluated. The results showed that the thermal stability of the modified insulation paper was superior to that of the unmodified paper. Molecular dynamics simulations were used to analyse the internal mechanism of the performance improvement achieved by modification with PPSQ. From a microscopic perspective, the addition of PPSQ provided a relatively larger structural space for the meta-aramid fibre and increased the free volume of the entire system, which tightened the meta-aramid fibre molecular chains, increased the density of the structure of the paper, and enhanced the mutual permeability between meta-aramid fibre chains. Therefore, the stress can be better transmitted, the performance loss such as phase delamination was effectively prevented, and the bonding between the meta-aramid fibres was strengthened.

中文翻译：

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PPSQ改性PMIA绝缘纸的热稳定性研究

需要开发用于高级配电变压器的新材料，以提高其耐热等级，操作安全性和可靠性。聚合物和纳米颗粒的组合是提高材料热稳定性的首选方法。在这项研究中，评估了实验室制备的聚苯倍半硅氧烷（PPSQ）改性的间位芳族聚酰胺绝缘纸的热稳定性。结果表明，改性绝缘纸的热稳定性优于未改性纸。分子动力学模拟用于分析通过PPSQ修饰实现的性能改善的内部机制。从微观的角度来看，PPSQ的添加为间位芳族聚酰胺纤维提供了相对较大的结构空间，并增加了整个系统的自由体积，从而拉紧了间位芳族聚酰胺纤维的分子链，增加了纸张结构的密度，并增强了相互之间的相互影响。间芳族聚酰胺纤维链之间的渗透性。因此，可以更好地传递应力，有效地防止了诸如相分层的性能损失，并且增强了间位芳族聚酰胺纤维之间的粘合。