The effects of hypochlorite level, i.e. 0.5; 1 and 2 active chlorine g/100g starch, on the properties of oxidized maize starch were investigated by FT-IR and solubility of oxidized starch and starch film. The obtained results shown that there was no difference of IR spectroscopy graph between native starch and oxidized starch. Although the analytical results indicated that there were carbonyl and carboxyl production, characteristic vibrations of these groups exhibiting on IR spectra was not clear due to either not enough content of carbonyl and carboxyl groups or covering of strong other absorptions. Notwithstanding, IR spectra also shown the change of intensity of characteristic vibrations. Moreover, solubility of starch oxidized by the highest oxidant content level experienced highest degree while solubility of this starch shown the lowest level. It means that carboxyl in this molecule starch, to some extent, esterified with hydroxyl of either other starch molecules or glycerol to produce crosslink. The obtained results also illustrated that there was a little scission chain in oxidation process when modifying maize starch by sodium hypochlorite.

The aim of this paper is to evaluate the role of nano rutile TiO2 (R‐TiO2) on the weathering resistance of UV curable acrylate urethane coating. At first, the nano R‐TiO2 at the content of 2 wt.% was dispersed in 1,6 Hexanediol for 3 hrs and then mixed with the urethane acrylate Eberyl 284 (E284) and photo initiator Irgacure 184 (I.184) for 30 min. After UV curing in FUSION UV equipment for 4.8 s, the coating unreinforced and reinforced 2 wt.% nano R‐TiO2 were analyzed by FE‐SEM in order to determine the dispersion of the nanoparticles in the polymer substrate and examined the accelerated aging in an Atlas UV/CON chamber. The aging of the coatings was assessed by IR analysis and measuring the losses of their weight and mechanical properties. The obtained results showed that the nanoparticles were distributed evenly in polymer substrate with the size of 50‐150 nm. In the presence of 2 wt.% R‐TiO2 nanoparticles, the acrylate urethane/R‐TiO2 nanocomposite coating was more weather durable than the neat coating (without the nanoparticles). After 48 aging cycles, the CH and CNH groups, the weight and the abrasion resistance of the nanocomposite coating slightly decreased, whilst those of the neat coating was severely degraded.

The purpose of this study is to assess the influence of R‐SiO2 nanoparticles on acid and alkali resistance of acrylic polyurethane coating. The resistance of the coatings with and without 2.5 wt.% R‐SiO2 nanoparticles in 5 % HCl solution and 5 % NaOH solution was investigated by monitoring the variations in functional groups of the coatings using IR spectroscopic analysis and the changes in their morphology using FE‐SEM analysis, as well as their weight loss analysis. The results showed that R‐SiO2 nanoparticles at content of 2.5 wt.% significantly increased the acid and alkali resistance of acrylic polyurethane coating. After 20 days of immersion in 5 % HCl solution and 5 % NaOH solution, the nanocomposite coating containing 2.5 % R‐SiO2 nanoparticles changed negligibly with a weight loss of about 1 % while the coating not containing R‐SiO2 nanoparticles was deformed seriously with a weight loss of about 3 %.

The purpose of this paper is to evaluate the photoprotective efficiency of organic UV absorber Tinuvin 384 (T384) on the photocurable acrylate urethane coating under the accelerated weathering condition. The coatings without and with 2 wt.% T384 were examined by UV/CON accelerated weathering testing device. The aging of the coatings was assessed by IR and FE-SEM analysis as well as the measurement of mechanical and weight loss. The obtained results showed that due to the photoprotection of T384, the urethane acrylate coating was stable under the effect of accelerated weathering factors. After 48 cycles of aging, the CH and CNH groups, the abrasion resistance and the weight of the paint films containing 2 wt.% T384 were slightly decreased. Its surface was damaged just a little, while that of the coating without T384 was severely degraded.

In this work, the monodisperse Fe3O4@Ag core‐shell hybrid nanoparticles (NPs) with an average size of 16.0 nm have been successfully fabricated by the seeded‐growth method in the organic solvent. The influence of the molar ratios of AgNO3/OLA on the formation of hybrid NPs has been investigated in detail to find the optimal conditions for the synthesis of the desired Fe3O4@Ag hybrid NPs. The hydrophobic Fe3O4@Ag hybrid NPs were successfully transferred into the water using poly (maleic anhydride‐alt‐1‐octadecene) (PMAO). The PMAO coated Fe3O4@Ag nanoparticles were well dispersed and stable in water over a wide range of pH from 2 to 11 as well as reasonable electrolyte concentration. The Fe3O4@Ag magneto‐plasmonic design can efficiently combine magnetic hyperthermia into an effective bimodal thermo‐therapy.