PBS-DLS-PEG copolymers were also tested for electrospinning and the process parameters were optimized for nanofibers preparation . However, the quality of the nanofibers was not perfect due to slow crystallization upon solvent evaporation (the crystallization temperature of PBS-DLS-PEG, Tc=31.5 °C (30) ). Therefore, we decided to use cellulose nanocrystals (CNCs) to promote faster crystallization and formation of uniform nanofibers. We used binary mixture of CHCl3/MeOH in 7/3 v/v ratio which yielded the best efficiency in earlier work with PBS-DLS copolymers . One noticeable observation was the increase in fiber diameter with the addition of CNC, consistent with previous studies where additive materials influenced fiber diameter . This increase in fiber diameter can be attributed to the dispersion of CNC within the polymer matrix. As the CNC particles disperse in the polymer solution, they can entangle