六水合硝酸镁增塑改性淀粉-聚乙烯醇复合膜的合成与性能  

Preparation and Properties of Starch/Poly(vinyl alcohol) Film Plasticized by Magnesium Nitrate Hexahydrate

作　　者：蒋婷[1] 江献财[1] 张晓飞[1] 代华[1] 张熙[1] 

机构地区：[1]四川大学高分子研究所,高分子材料工程国家重点实验室,成都610065

出　　处：《高等学校化学学报》2012年第12期2822-2826,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:50833003)资助

摘　　要：以六水合硝酸镁[Mg(NO3)2.6H2O]为增塑剂,采用流延法制备了增塑改性的淀粉-聚乙烯醇(PVA)复合膜,并研究了改性后淀粉-PVA复合膜的性能.研究结果表明,Mg(NO3)2.6H2O与淀粉和PVA发生一定的相互作用,破坏了淀粉和PVA中的结晶结构.因此,Mg(NO3)2.6H2O的加入可提高淀粉与PVA间的相容性,改变了淀粉-PVA复合膜的力学性能,使其拉伸强度下降,断裂伸长率提高.The plasticized starch/poly （vinyl alcohol） （PVA） film was prepared by casting method using magnesium nitrate hexahydrate [ Mg（ NO3 ）2· 6H2O] as the plasticizer. The micro morphologies of pure starch/ PVA and Mg （NO3 ）2 · 6H2O plasticized starch/PVA film were observed by scanning electron microscope （SEM）. The interaction between Mg（ NO3）2 · 6H2O and starch/PVA molecule was investigated by Fourier transform infrared （FTIR）. The crystallinity and thermal properties were measured by X-ray diffraction measurement（XRD） and thermogravimetric analysis （TGA）. The mechanical properties were measured by tensile testing and dynamic mechanical analysis（DMA）. It was found that Mg（NO3）2 · 6H2O could form some interaction with starch and PVA molecules. The addition of Mg（ NO3 ）2 · 6H2O could improve the miscibility of starch and PVA. The XRD results showed that Mg（ NO3 ）2 · 6H2O could destroy the crystals of starch and PVA. The TGA results showed that the thermal stability of starctCPVA decreased with the addition of Mg（ NO3 ）2 · 6H2O . Tensile testing showed that Mg（ NO3 ）· 6H2O was highly effective in modifying the mechanical properties of starch/PVA film, making the elongation at break of starch/PVA film largely increased from 8% of pure starch/PVA film to 514% with 60% Mg（NO3 ）2 · 6H2O .

关 键 词：聚乙烯醇 淀粉 六水合硝酸镁 增塑 力学性能 

分 类 号：O636.12[理学—高分子化学]