摘要
采用柠檬酸交联淀粉、明胶和普鲁兰多糖共混反应,乙二醇为增塑剂,制备普鲁兰多糖-马铃薯淀粉-明胶三元复合薄膜,探究了淀粉/明胶的质量比和普鲁兰多糖添加量对复合薄膜的影响以及生物降解性能,并利用X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)、动态热机械分析(DMA)、原子力显微镜(AFM)等对复合膜的结构、热学性能、形貌等进行表征。结果表明:当淀粉/明胶质量比为3.0∶2.0,普鲁兰多糖添加量为1.00 g时,复合膜的力学性能最佳,对应的断裂伸长率为67%,拉伸强度达到3.25 MPa,薄膜表面规整无孔隙,粗糙度为15.7 nm,差异度为0.811%。通过土埋生物降解实验发现,该复合薄膜15 d后降解率接近于100%。随着普鲁兰多糖添加量的增加,降低了复合膜中淀粉的结晶度,提高了组分间的相容性,使复合膜稳定性增强,初始储能模量增加了402 MPa,玻璃化转变温度(Tg)降低了约21℃,复合薄膜的刚度和柔性都得到增强。
The pullulan-potato starch-gelatin ternary composite film was prepared by citric acid crosslinked starch,gelatin and pullulan polysaccharide blending reaction with ethylene glycol as plasticizer. The effects of starch/gelatin mass ratio and pullulan content on the composite film and biodegradability were investigated. The structure, thermal properties and morphology of the composite film were characterized by X-ray diffractometer(XRD), Fourier transform infrared spectrometer(FTIR), dynamic thermomechanical analysis(DMA) and atomic force microscope(AFM). The results show that when the mass ratio of starch/gelatin is 3.0∶2.0 and the amount of pullulan is 1.00 g, the mechanical properties of the composite film are the best, the corresponding elongation at break is 67%, the tensile strength reaches 3.25 MPa, the surface of the film is regular and non-porous, the roughness is 15.7 nm, and the difference is 0.811%. Through the soil burial biodegradation experiment, it is found that the degradation rate of the composite film is close to 100% after 15 d.With the increase of pullulan content, the crystallinity of starch in the composite film decreases, the compatibility between the components is improved, and the stability of the composite film is enhanced. The initial storage modulus is increased by 402 MPa, the glass transition temperature(Tg) is decreased by about 21 ℃, and the stiffness and flexibility of the composite film are enhanced.
作者
杨帆
郭玉华
李丽雅
张国邦
王坤燕
梁秋
YANG Fan;GUO Yu-hua;LI Li-ya;ZHANG Guo-bang;WANG Kun-yan;LIANG Qiu(School of Engineering,Huzhou University,Huzhou 313000,China)
出处
《塑料科技》
CAS
北大核心
2022年第12期11-17,共7页
Plastics Science and Technology
基金
国家级大学生创新创业训练计划项目(202110347037)
湖州市公益性应用研究项目(2021GZ09)。
关键词
普鲁兰多糖
淀粉
明胶
力学性能
生物降解
Pullulan
Starch
Gelatin
Mechanical properties
Biodegradation
作者简介
联系人:郭玉华,guoyuhua@zjhu.edu.cn。
