Palm oil-based polyester polyol was synthesized by reacting epoxidized palm olein with malonic acid under a convenient one-pot synthesis method. The optimum reaction time, temperature, and functionality molar ratio were determined. The optimal polyol consisted of hydroxyl and acid values of 98.19 and 1.44 mg KOH/g sample, 95% conversion of epoxides and M n of 5201 Da; and the chemical structure was elucidated by Fourier transform infrared , Carbon-13 nuclear magnetic resonance (NMR), and 1 H-NMR. The polyol was appeared as light-yellowish liquid with cloud and pour points of 12 and 10 C and reacted with isophorone diisocyanate to produce polyurethane with interconnected pores ranged 35-2165 μm, porosity ranged 89-90%, tensile strength ranged 59-78 kPa, and compression stress ranged 48-55 kPa. The polyurethanes showed 120-260% water-uptake and controlled mass loss (1.6-15.3%) after 28 days of enzymatic degradation. PU 1 demonstrated slight cytotoxicity with cell proliferation and adhesion observed after 24 h incubation, demonstrated its potential as biomaterial for biomedical applications.PU 1, PU 2, and PU 3 were synthesized by reacting polyester polyol with IPDI at isocyanate index of 1.0, 1.2, and 1.4, respectively. ARTICLEWILEYONLINELIBRARY.COM/APP

The areal density of information stored on the hard disk has doubled every two years. This substantial increase in disk storage has resulted from the application of giant magnetoresistance heads, new thin film media, and better electronic recording channels. However, such an increase cannot be easily attained without reducing the separation between the magnetic read-write head and magnetic recording medium surfaces. This can be achieved by using a thinner protective overcoat. In this study, ultrathin tetrahedral amorphous carbon (ta-C) films were deposited on magnetic hard disks (CoCrTa/Cr/NiP/Al–Mg) by a magnetic filtered cathodic arc deposition under different substrate bias voltages. The obtained films exhibited smoother surfaces than the uncoated disks as indicated by the atomic force microscopic measurement. The Raman spectra acquired showed a single asymmetric Lorentzian curve shape. Tetrahedral amorphous carbon coatings were subjected to an accelerated corrosion test in vapors of concentrated hydrochloric acid for 24 h. The corrosion test demonstrated a reduced density of corrosion sites when compared to conventional diamond-like carbon films. Similarly, the scratch resistance of the ta-C coated disks, investigated by a nanoindenter, showed significant improvement in comparison to uncoated disks.