Zuo Yingfeng, He Xiaoyu, Li Ping, Li Wenhao, Wu Yiqiang
College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, Hunan, China.
Polymers (Basel). 2019 Jan 5;11(1):72. doi: 10.3390/polym11010072.
Three kinds of hydrophobic groups grafted starches of maleic anhydride grafted starch (MAH--starch), lactic acid grafted starch (LA--starch), and methyl acrylate grafted starch (MA--starch) were prepared by in situ solid phase polymerization. The results of Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) confirmed successful grafting. The grafting ratios of MAH--starch, LA--starch, and MA--starch were 6.50%, 12.45%, and 0.57%, respectively. Influenced by the grafting ratio, LA--starch had the best relative hydrophobicity and the largest molecular weight, and those for MA--starch were the worst. The surfaces of grafted starches were covered with graft polymer, with obvious surface roughness and bond degree of MAH--starch and LA--starch. The crystalline structure of grafted starches showed some damage, with LA--starch exhibiting the greatest decrease in crystallinity, and less of a change for MA--starch. Overall, the grafting reaction improved thermoplasticity, with LA--starch the most improved, followed by MAH--starch, and then MA--starch.
通过原位固相聚合法制备了三种疏水基团接枝淀粉，即马来酸酐接枝淀粉（MAH-淀粉）、乳酸接枝淀粉（LA-淀粉）和丙烯酸甲酯接枝淀粉（MA-淀粉）。傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）结果证实了接枝成功。MAH-淀粉、LA-淀粉和MA-淀粉的接枝率分别为6.50%、12.45%和0.57%。受接枝率影响，LA-淀粉具有最佳的相对疏水性和最大的分子量，而MA-淀粉的相对疏水性和分子量最差。接枝淀粉表面覆盖有接枝聚合物，MAH-淀粉和LA-淀粉的表面粗糙度和键合度明显。接枝淀粉的晶体结构出现了一些损伤，其中LA-淀粉的结晶度下降最大，而MA-淀粉的变化较小。总体而言，接枝反应提高了热塑性，其中LA-淀粉提高最多，其次是MAH-淀粉，然后是MA-淀粉。
Zotero 插件
