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Liquid exfoliated, hydroxylated functionalized hexagonal boron nitride nanosheets (h-BNNSs-OH) are prepared for improved dispersion in polymers. Polymer nanocomposites are fabricated using (0–0.03 V_f) hydroxyl (OH) functionalized and non-functionalized BNNSs with poly methyl methacrylate, PMMA, by solution mixing for comparative study. Mechanical properties of the composites are improved considerably. The maximum ultimate tensile strength of the functionalized BN/PMMA (0.003 V_f BN) reached to ~ 26 MPa as compared to non-functionalized composites maximum value of ~ 19 MPa while the base polymer value remained at ~ 15 MPa. The Young’s modulus enhanced as well from 1.45 GPa (PMMA) to 2.01 GPa and 2.19 GPa both for non-functionalized and functionalized composites respectively. The degree of reinforcement validated with the Halpin–Tsai Model is in close agreement for …