两性接枝改性对淀粉膜性能的影响  

Effect of amphoteric grafting modification on the property of starch film

作　　者：沈仕奇 祝志峰[1] 

机构地区：[1]江南大学生态纺织教育部重点实验室,无锡214122

出　　处：《化工新型材料》2015年第9期172-174,共3页New Chemical Materials

基　　金：江南大学生态纺织教育部重点实验室开放研究基金资助项目(KLET0617)

摘　　要：以Fe2+-H2O2为引发剂,在水介质中引发甲基丙烯酰氧乙基三甲基氯化铵(DMC)和丙烯酸(AA)与玉米淀粉进行接枝共聚合,制备两性淀粉接枝共聚物。通过采用热重分析(TG)、X射线衍射(XRD)方法对淀粉的热稳定性及淀粉膜结构进行表征。然后以淀粉膜的断裂强度、断裂伸长、断裂功、耐挠曲疲劳性及水溶性为评价指标,探讨了这种接枝改性对淀粉膜特性的影响。实验结果表明:两性接枝改性能够提高淀粉的热稳定性,降低淀粉膜的结晶度,显著提高淀粉膜的断裂伸长、断裂功、耐挠曲疲劳性和水溶性,降低淀粉膜的脆硬属性,赋予淀粉膜以一定的韧性。The starch graft copolymer with amphoteric branches could be prepared via the graft copolymerization of cornstarch with 2-methacryloyloxyethyltrimethyl ammonium chloride（DMC） and acrylic acid（AA） in aqueous medium u sing Fe2＋-H2 02 initiator. The starch graft copolymer was characterized with thermogravimetric analysis（TG）, X-ray dif fraction（XRD） for thermal stability of starch and structure of film. Influence of amphoteric grafting copolymerization upon the mechanical properties of films were studied in terms of tensile strength, breaking elongation, work-to-break, flex fatigue resistance and water solubility. The investigation results showed that amphoteric grafting modification was able to improve the thermal stability of starch, reduced the crystallinity of film,markedly improved breaking elongation,work to break, flex fatigue resistance,and water solubility of film. The copolymerization showed the ability to reduce the brittleness and stiff- ness of films for toughing films.

关 键 词：接枝共聚合 淀粉 薄膜 力学性能 

分 类 号：O636.12[理学—高分子化学]