玉米淀粉/蛋壳粉复合膜的制备及性能分析

以玉米淀粉（corn starch，CS）和蛋壳粉（eggshell powder，ESP）为主要成膜基材制备CS/ESP复合膜。研究CS质量浓度、ESP添加量、丙三醇（glycerol，Gly）添加量3 个因素对CS/ESP膜抗拉强度（tensile strength，TS）、断裂伸长率（elongation at break，EB）、水蒸气透过系数（water vapour permeability，WVP）和氧气透过率（oxygen permeability，OP）的影响。在此基础上采用主成分分析法对膜性能进行综合评价，并通过响应面法优化试验得到CS/ESP膜制备的最佳工艺参数，具体如下：CS质量浓度4.9 g/100 mL、Gly添加量49%（m/m）、ESP添加量1.9%（m/m），对应CS/ESP膜的TS、EB、WVP和OP分别为4.97 MPa、109.12%、1.31×10－12 g/（cm·s·Pa）和1.19×10－5 cm3/（m2·d·Pa）。傅里叶变换红外光谱分析表明ESP和CS具有较好的相容性。X射线衍射和热重分析结果表明ESP的添加提高了CS/ESP膜的结晶度和热稳定性。扫描电子显微镜分析表明CS/ESP膜具有光滑的表面和断面形貌，没有明显的突起和腔。

Preparation and Properties of Corn Starch/Eggshell Powder Composite Film

A composite film was prepared using corn starch (CS) and eggshell powder (ESP) as the main film-forming substrates. The effects of CS, ESP and glycerol (Gly) concentration on the tensile strength (TS), elongation at break (EB), water vapor permeability (WVP), and oxygen permeability (OP) of CS/ESP film were studied. Principal component analysis method was used to comprehensively evaluate the film properties. The optimum process parameters determined through response surface methodology were as follows: CS 4.9 g/100 mL, glycerol 49%, and ESP 1.9%. The TS, EB, WVP, and OP of the film prepared under the optimized conditions were 4.97 MPa, 109.12%, 1.31 × 10-12 g/(cm·s·Pa) and 1.19 × 10-5 cm3/(m2·d·Pa), respectively. Fourier transform infrared spectroscopic (FTIR) analysis showed that ESP and CS had good compatibility with each other. X-ray diffraction (XRD) and thermogravimetric analysis (TGA) results showed that the addition of ESP improved the crystallinity and thermal stability of CS/ESP film. Scanning electron microscopy (SEM) analysis revealed that the CS/ESP film had a smooth surface and cross-sectional morphology without obvious protrusions and cavities.