紫外光引发的玉米淀粉在软材料表面的改性

以玉米淀粉作为改性剂、二苯甲酮（BP）做光引发剂对聚合物材料表面进行紫外光偶合反应，用X-射线电子能谱(XPS)、水接触角(CA)和扫描电子显微镜(SEM)对改性后的聚合物表面进行了结构和性能表征。结果表明，玉米淀粉被固定到CPP膜表面的最佳条件为0.03g/L玉米淀粉、1.0g/L BP、12.0mW/cm²光强和8min光照时间。玉米淀粉改性后的CPP膜的接触角可由105.0°变为66.3°。随着玉米淀粉的初始浓度的增加，改性CPP膜的表面水接触角先随之下降然后略有上升；延长光照时间和增加光强均会使玉米淀粉改性的CPP膜的表面水接触角随之下降。玉米淀粉改性后的CPP膜的表面形成了一定规则形状的颗粒结构。

UV-induced surface modification of soft polymer with corn starch

Corn starch has been used for the surface modification of a cast polypropylene (CPP) polymer surface using benzophenone (BP) as photoinitiator. The modified polymer surfaces were characterized by X ray photoelectron spectroscopy(XPS), water contact angle (CA) and scanning electron microscopy (SEM). It was found that the optimal conditions for preparing corn starch modified CPP film are concentrations of 0.03g/L for corn starch and 1.0g/L for BP, with a photointensity of 12.0mW/cm² for a time of 8 min. The contact angle of the CPP surface was reduced from 105.0° to a minimum of 66.3° after modification with corn starch. The contact angle was found to reach a minimum value at intermediate starchconcentrations and after prolonged irradiation times and high photointensities. Spontaneous formation of small granules of corn starch on the modified CPP surface were observed by SEM. 