Preparation of Modified Starch Nanocrystals with Low Surface Energy

The modified starch nanocrystals were prepared through multicomponent reaction of polydimethylsiloxane with isocyanate terminal groups, diphenylmethane diisocyanate and hydroxyl groups of the starch nanocrystals. The modified starch nanocrystals with low surface energy polydimethylsiloxane chains have good dispersion. The structure and morphology of the modified starch nanocrystals were studied through Fourier Transform Infrared Spectroscopy (FT-IR), proton Nuclear Magnetic Resonance (1H-NMR) Spectroscopy, X-ray Photoelectron Spectroscopy (XPS), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), etc. Results showed that low surface energy polydimethylsiloxane and diphenylmethane diisocyanate reacted with the starch nanocrystals to obtain synergistic modified starch nanocry stals. The diameter of nanoparticles was 50—100 nm. Moreover, wettability experiment showed that the modified starch nanocrystals suspension was dispersed stably in distilled water, dichloromethane, ethyl acetate and acetone.