柠檬酸改性聚乙二醇/丝胶蛋白复合膜的性能

Properties of Citric Acid Modified Polyethylene Glycol/Sericin Composite Membrane

为提高丝胶膜的实际应用价值,采用水蒸气提取的丝胶为基质,添加聚乙二醇400及柠檬酸进行改性,以普通的流延法将其制备成膜,并以纯丝胶膜为对照,通过傅里叶红外光谱(FTIR)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)及力学性能等测试表征其结构与性能变化。结果表明:添加聚乙二醇400能制得完整、难溶于水且具备较好力学性能的聚乙二醇400/丝胶复合膜;采用柠檬酸对聚乙二醇400/丝胶复合膜进行交联后,其耐水溶失及力学性能得到进一步提升,当柠檬酸浓度为0.8%时,复合膜应变增加了3.5倍左右,且表面平整,亲水性能提升,结构有明显改变,具有一定的防紫外线能力。本文通过对丝胶进行改性制备了丝胶复合膜,在医用材料方面有一定的应用前景。

In order to improve the practical application value of sericin membrane,sericin extracted with water vapor was used as the matrix,and modified by adding polyethylene glycol 400 and citric acid.The membrane was prepared by or⁃dinary flow⁃casting method,and pure sericin membrane was taken as the control.Fourier transform infrared spectroscopy(FTIR),X⁃ray diffraction(XRD),Scanning electron microscope(SEM)and mechanical properties were used to charac⁃terize the structure and properties.The results showed that polyethylene glycol 400/sericin composite membrane could be prepared by adding glycol 400,which was difficult to dissolve in water and had good mechanical properties.After the polyethylene glycol 400/sericin composite membrane was crosslinked with citric acid,its water solubility resistance and mechanical properties were further improved.When the concentration of citric acid was 0.8%,the strain of composite membrane increased by about 3.5 times,with smooth surface,improved hydrophilicity,significantly⁃changed structure and certain UV resistance.In this paper,sericin composite membrane was prepared by modifying sericin,which has cer⁃tain application prospect in medical materials.