魔芋粗粉辐照接枝及产物结构表征

用⁶⁰Coγ照射引发魔芋 丙烯酸接枝反应，制备接枝聚合物，以聚合物吸水倍数为标准优化反应物用量、干燥温度和方式等。采用FT-R、SEM技术对产物结构形貌进行表征。结果表明，最佳粗粉接枝工艺为：3g魔芋粉、21mL丙烯酸、12.9mL9.5mol/LNaOH、131mL水，辐照后8h再进行干燥处理，产物吸自来水倍数可达400倍以上；接枝物具有多层孔状结构，单孔直径约为16μm，孔内有横膜；接枝物含有两种接枝高分子成分，即魔芋KGM-丙烯酸接枝物和魔芋淀粉丙烯酸接枝物。材料的多孔结构是吸水的原因，魔芋辐照改性将为魔芋粗粉的用途开辟新的途径。

Polymeric Technics and Production Analysis of Crude Konjac Powder Grafting by Irradiation

Crude konjac powder and acrylic acid were grafted via ⁶⁰Co γ ray irradiation and the factors including reactant weight, style and temperature of drying were discussed which affected the water absorption of copolymer. The copolymer structure was characterized by fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The results show that the optimum feed ratio is crude konjac powder∶aerylic acid∶NaOH (9.5 mol/L)∶water=3 g∶21 mL∶12.9 mL∶131 mL. The optimum gel drying temperature is 50 ℃. SEM shows that the copolymer has formed dense network structure which is the base of water absorption. FT-IR analysis shows that the crude konjac powder includes starch and it grafts with acrylic acid by irradiation when KGM grafting acrylic acid synchronously.