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Ultimately, challenges and future prospects are also discussed.In this research, two groups of polyurethane (PU) nanocomposites were developed based on PCL500-PEGx-PCL500 tri-block polyols and cellulose nanowhisker (CNW), as a cross-linker and controller of microphase separation of blocks. The effect of PEGx block length on phase segregation and crystallization of blocks was evaluated. The impact of tuned crystallization and hard domain morphology on shape memory parameters was studied in detail. PU2000-0.25 % was selected as the optimu