HCNC powder was added to the triblock copolymer solution and the mixture was ultrasonicated for 5 min (40 % amplitude, and pulse of 15 s on, 10 s off). The addition of CNCs to the monomer mixture required an increase in the amount of solvent (and a switch from DMSO to DMAc) used for dispersing and processing of the monomer mixture when compared to our previous research. The samples were prepared with the minimum amount of solvent necessary for a homogeneous dispersion, which was determined experimentally for the highest HCNC concentration. The hydrophobically masked monomer TMS-HEA was added to the mixture, which was then vortexed for 180 s and ultrasonicated for 10 min. The UV initiator (3 mg) was added to the monomer mixture, which was vortexed for a further 90 s. Then, the monomer mixture was placed on glass 1 , from -150 °C to 150 °C to -150 °C. The glass transition temperature was determined from the transition mid-point of the second heating curve.