Network formation of nanofibrillated cellulose in solution blended poly(methyl methacrylate) composites

► Injection moldable composites were prepared by solution blending of NFC and PMMA. ► Unmodified and PMMA-grafted NFC were compared. ► Percolating nanofibril network formed between 1 and 5 wt.% NFC content. ► Grafted NFC protected the matrix polymer from degradation during melt processing.