▎ 摘　　要

In this work, a mechanically strong and tough novolac phenolic nanocomposites (GESNH) was successfully constructed by modulating its load transfer efficiency and chain segment mobility with reactive micro-sized graphene oxide aerogel (GES). DMA analysis reveals that the microstructure of GESNH can be divided into three regions including the "bricks in mortar" structure, the main phenolic networks and the constrained region, according to the significant difference in glass transition temperature (Tg) and fractional free volume (fg). Via controlling the volume fraction of three regions, load transfer efficiency and chain segment mobility of GESNH can be effectively tuned. Especially for 0.5%GESNH-5, flexural, tensile properties and fracture toughness are increased by 44.71%, 60.41% and 96.34%, compared with those of 0.5%GNH, where the volume fraction of the "bricks in mortar" structure as 0.086 and the constrained region as 0.169 facilitate the load transfer and the chain segment mobility, simultaneously.