中文摘要：

通过端异氰酸酯基与淀粉纳米晶表面的部分羟基反应，引入聚二甲基硅氧烷分子，制备表面能低、分散稳定的改性淀粉纳米晶。通过红外光谱（FT-IR）、核磁共振氢谱（1H-NMR）、光电子能谱（XPS）、X射线衍射仪（XRD）、扫描电镜（SEM）等对其结构和形貌进行表征。结果表明，低表面能有机硅分子和二苯甲基二异氰酸酯反应到淀粉纳米晶上，其纳米颗粒粒径为50-100 nm，分散均匀。此外，浸润性实验表明，改性淀粉纳米晶在水、二氯甲烷、乙酸乙酯、丙酮中分散稳定。

英文摘要：

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.