Evaluating PEG block length and CNC content on microphase separation of blocks in PCL-PEG-PCL/CNC based polyurethane nanocomposites

In this work, a series of hydrogel polyurethane nanocomposites have been developed based on PCL-PEGPCL triblock polyol and cellulose nanocrystal (CNC) as a cross-linker and controller of microphase separation of blocks. Microphase separation of blocks was studied in detail as a function of PEG block length and CNCs content. CNC nanorods were found to act as a reducing agent of the microphase separation, possibly by rearranging the blocks through changing the morphology of hard domains from a 3D to a shell-like 2D structure, affecting the freedom of movement of the blocks, and finally controlling thermodynamic behaviors.

کلیدواژه ها:

PCL-PEG-PCL ، Cellulose nanocrystal ، Polyurethane hydrogel ، Nanocomposite.