羟丙基纤维素/明胶复合膜的制备及性能表征

Preparation and Performance Characterization of Hydroxypropyl Cellulose/Gelatin Composite Films

以环氧氯丙烷(ECH)作为羟丙基纤维素(HPC)和明胶(GEL)的交联剂,通过均相混合、交联、溶液浇铸、蒸发等工艺制备了一系列ECH交联的HPC/GEL复合膜(EHGF)。利用傅里叶红外光谱(FTIR)、X射线衍射仪(XRD)、紫外-可见分光光度计(UV-Vis)、扫描电子显微镜(SEM)、热重分析仪(TG)、接触角、力学性能等测试手段对EHGF复合膜的结构、微观形貌、热稳定性、耐水性及拉伸断裂强度进行表征和分析。结果表明:交联作用存在于HPC和GEL组分之间,各组分间具有好的相容性;与HPC/GEL共混膜相比,EHGF复合膜显示了更均匀致密的断面形貌和更高的热稳定性,且ECH的交联作用显著提高了HPC/GEL复合膜的水接触角和断裂强度。

A series of epichlorohydrin-cross-linked hydroxypropyl cellulose/gelatin protein composite films(EHGF) was prepared from hydroxypropyl cellulose(HPC) and gelatin(GEL) with epichlorohydrin(ECH) as crosslinking agent using a process involving homogeneous blending, cross-linking, solution casting, and evaporation. Their structure, micro-morphology, thermal stability, water resistance and tensile breaking strength were characterized with Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD), ultraviolet-visible spectrophotometer(UV-Vis), scanning electron microscopy(SEM), thermogravimetric analyzer(TG), contact angle and mechanical testing. The results showed that the cross-linking interactions existed in the inter-and intramolecules of HPC and GEL components, and EHGF films had good compatibility. Compared with HPC/GEL blend films, EHGF composite films exhibited more homogeneous and compact cross-section morphology and higher thermal stability, and their water contact angle and tensile breaking strength were significantly improved from the cross-linking effect of ECH.