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Polyurethane has a wide range of chemical structures available led to the design of materials that easily can meet requirements to shape memory polyurethane (SMPU) due to its ability to retain its shape after deformation through giving a certain disturbance like magnetic field. Based on the previous study, polyurethanes synthesized by reacting 4,4’-methylenebis (cyclohexyl isocyanate) to poly(ethylene glycol) Mw: 6000 as polyurethane chain with 1,1,1-trimethylol propane as chain extender, is a potential candidate for shape memory polyurethane (SMPU). Furthermore this study was performed by adding Fe3O4 nanoparticles as a filler to provide magnetic behavior. In this study, The magnetic and mechanical properties of the SMPU after adding Fe3O4 nanoparticles were evaluated by observing compatibility between the filler and matrix, morphology, ability in retaining shape, and mechanical properties through measuring FTIR, FESEM, Vibrating Magnetometer and UTM, respectively. This study reported a good compatibility between Fe3O4 and the polyurethane, and lack agglomeration of Fe3O4 nanoparticles indicated FTIR and FESEM-EDAX, the fastest ability on retaining its shape obtained from materials with lowest Fe3O4 (3 wt%). Meanwhile the best mechanical and magnetic was resulted from adding 11 wt% of Fe3O4

Lignin which is hydrophobic due to presence of carbonyl; carboxyl; hydroxyl and phenol functional group, can be used as compatibilizing agent through grafting a hydrophobic part such as polyurethanes. Lignin-based biopolyurethane (bioPU), was synthesized by two stages of reaction viz., polyurethane preparation through reacting 4,4′-Methylenebis (CyclohexylIsocyanate) (HMDI) and polyethylene glycol (PEG, molar mass of 4000 g/mol); bio-PU preparation through grafting lignin onto the polyurethane. The ratio of diisocyanate to polyol and lignin addition were varied in 1: 4, 1:1 and 0.25 g, 0.5 g, 1 g, respectively. Products were investigated by observing FESEM (Field Emmision Scanning Electron Microscope), 1H NMR (Nuclear Magnetic Resonance) and FTIR (Fourier Transform Infra-Red Spectroscopy). The FESEM result shows that lignin based bioPU with isocyanate/polyol ratio 1:4 and 1 g lignin addition is more homogenous than isocyanate/polyol ratio 1:1 and 0.25 g lignin. The NMR and the FTIR spectra reveal the lignin grafed onto polyurethane product. The addition of 0.25 and 1 g lignin resulted in 0.2 and 0.6 hidrophilic/hidrophobic segment ratio, respectively. Furthermore, characterizations of the products confirmed that the lignin-based bioPU can be a promising compatibilizer.