▎ 摘　　要

The use of nanofillers in biocomposites has increased over time as a result of a number of advantages, including high strength, good adhesion, and a high strength-to-weight ratio. The coir-based natural fiber was combined with different weight percentages of graphene powder, including 2.5, 5, and 7.5 wt%, as well as 6, 18, and 25 micrometer-sized particles, in an epoxy matrix to study the effects of nanofiller quantity and average particle size on enhancing mechanical properties. This study's novelty is its thorough examination of the filler's effects on particle size and contribution in an epoxy-based coir/graphene composites. The outcomes show that samples with a content of 5 wt% nanofiller outperformed in the content-wise analysis. The samples had 5 wt% of nanographene fillers with a 25 mu m particle size that measured 59 MPa. Similar to this, samples with 5% nanographene concentration outperformed with 236 MPa and 37 kJ/m(2) respectively and improved but with particles whose size is proportional to the flexural strength.