Molecular Simulation of Improved Mechanical Properties and Thermal Stability of Insulation Paper Cellulose by Modification with Silane-Coupling-Agent-Grafted Nano-SiO2

Cellulose is an important part of transformer insulation paper. Thermal aging cellulose occurs in long-term operation transformers, which deteriorates the mechanical properties and thermal stability cellulose, resulting a decrease life. Therefore, improvement has become research hotspot. In this study, effects different silane coupling agents on modified were studied. The simulation results showed that parameters are only slightly improved by KH560 (?-glycidyl ether oxypropyl trimethoxysilane) KH570 (?-methylacrylloxy propyl trimethoxy silane) nano-SiO2, while greatly KH550 (?-aminopropyl triethoxy KH792 (N-(2-aminoethyl)-3-amino nano-SiO2. glass-transition temperature composite model 24 K higher than unmodified model. mechanism change was analyzed from point view free-volume theory. main reason for free volume abruptly changes, increases space movement chain accelerates whole molecular chain. modifying with KH792-modified nano-SiO2 can significantly enhance cellulose.