中文摘要：

通过异氰酸酯与端羟基聚己内酯反应制备端异氰酸酯基预聚体，再接枝到淀粉纳米晶表面，制备了端基分子量可控的聚己内酯接枝淀粉纳米晶。分别用FTIR和1HNMR对所制备的聚己内酯接枝淀粉纳米晶进行表征，结果表明，有少量聚己内酯接枝到淀粉纳米晶表面。XRD结果表明．接枝了少量聚己内酯后的淀粉纳米晶的晶型和结晶度与未接枝的淀粉纳米晶基本一致。聚己内酯接枝淀粉纳米晶的熔融温度由115℃左有提高到122℃左右，并且温度范围变宽。浸润性实验表明，聚己内酯接枝淀粉纳米晶与水不浸润，其表面已具有疏水性。聚己内酯仅接枝在淀粉纳米晶的表面，改善了淀粉纳米晶表面的疏水性能和与聚酯类聚合物的界面相容性。聚己内酯接枝淀粉纳米晶有望用于可降解聚酯类高分子材料，如聚乳酸（PLA）、聚己内酯（PCL）、聚丁二酸丁二醇酯（PBS）等，改善其力学性能和生物降解性能等。

英文摘要：

Starch nanocrystals-g-polycaprolactone with controllable molecular weight of the grafting chain was prepared by grafting reaction of starch nanocrystals and isoeyanate group-ended prepolymer, which was prepared by esterifieation of isocyanate and hydroxyl-terminated polycaprolactone. Starch nanocrystals-g-polycaprolactone were characterized by FTIR and ）H NMR, the results showed that a small amount of polyeaprolactone was grafted on the surface of starch nanoerystals. X-ray diffraction showed that the graft of a small amount of polycaprolactone can hardly change the crystalline type and degree of crystallinity of starch nanocrystals. The melting temperature of starch nanocrystals-g-polyeaprolactone was increased from around 115℃ to around 122℃. Wettability experiments showed no wetting between starch nanocrystals-g-polyeaprolaetone and water, and it has a hydrophobic surface. This shows that polyeaprolaetone can be grafted onto surface of starch nanocrystals and the graft can improve the hydrophobie properties of starch nanoerystals and interface compatibility with the polyester matrix. Starch nanoerystals-g- potycaprolaetone can be used for the biodegradable polyester polymer, such as polylactie acid （PLA）, polyeaprolaetone （PCL）, poly （butylene sueeinate） （PBS）, etc., to improve its mechanical properties and biodegradation properties.