离子交联法制备壳聚糖/结冷胶可降解复合膜的研究
详细信息Study on preparation of chitosan and gellan gum biodegradable composite film by ionic cross-linking
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摘要: 以壳聚糖和结冷胶为成膜材料,甘油为增塑剂,4%柠檬酸钠和2%氯化钙溶液为交联剂,制备水不溶性可降解复合膜。研究交联时间和交联pH对复合膜机械性能和阻水性的影响,并通过扫描电镜、差示扫描量热法、红外光谱和X-射线衍射对其结构和热稳定性进行表征。结果表明,柠檬酸钠和氯化钙对复合膜的交联降低了壳聚糖和结冷胶的结晶度,提高了复合膜的热稳定性;当交联时间为5min、交联溶液pH为6时,复合膜的机械性能最好,抗拉强度达91.45MPa,水溶性为7.28%,溶胀度为416.63%,水蒸气透过率为0.68×10-10g/（Pa·s·m2）;复合与离子交联改善了单一膜机械性能不足及阻水性差的缺点。Abstract: A biodegradable composite film without water solubility was made from chitosan and gellan, glycerin as plasticizers, cross-linked by 4% sodium citrate and 2% calcium chloride. Effect of cross-linking time and pH on the mechanical properties and water resistance of composite film were investigated. Besides, infrared spectrum (FT-IR) , X-ray diffraction (X-RD) , scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) were used to characterize and analyze the structure and thermal stability of the film. The results showed that sodium citrate and calcium chloride cross-linked composite film, and the cross-linking decreased the crystallinity of chitosan and gellan, and then improved thermal stability of composite film. The composite film had the best properties under a cross-linking time of 5min and pH6. 0, tensile strength 91. 45MPa, water solubility 7. 28%, swelling ratio 416. 63%, water vapor permeability 0. 68×10-10g/ (Pa·s·m2) , compounding and ion crosslinking improved mechanical properties and water resistance of single film.
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