海藻酸钠/浒苔多糖复合膜的制备及性能

Preparation and properties of sodium alginate/enteromorpha polysaccharide composite film

中文关键词: 海藻酸钠  浒苔多糖  复合膜  性能

英文关键词: Sodium alginate  Enteromorpha polysaccharide  Composite film  Properties

中文摘要:

      为探讨海藻酸钠与浒苔多糖的协同作用，本研究首次以海藻酸钠和浒苔多糖为基材，甘油为增塑剂制备生物降解复合膜，探究了海藻酸钠与浒苔多糖质量比、共混溶液总浓度、甘油含量对复合膜拉伸强度、断裂伸长率、水蒸气透过率和水溶性的影响，同时，利用扫描电子显微镜技术(SEM)、傅里叶红外光谱(FTIR)进行微观结构表征。结果显示，海藻酸钠与浒苔多糖之间具有良好的相容性和协同作用，无明显的相分离现象。组分质量比、共混总浓度和甘油含量均对膜性能有较大影响，其中，质量比影响最显著，添加适量浒苔多糖可提高海藻酸钠膜的拉伸强度和断裂伸长率，降低海藻酸钠膜的水蒸气透过率，但膜水溶性略微提高。在组分质量比为8∶2时，膜拉伸强度从99.22 MPa增加到108.41 MPa，断裂伸长率从5.14%增加到6.20%，水蒸气透过率从6.445×10–11 g/(m·s·Pa)降低到6.027×10–11 g/(m·s·Pa)，复合膜的综合性能达到最优。进一步优化了共混总浓度和甘油含量，最佳共混总浓度为1.6%(m/v)，最佳甘油含量为0.9%(m/v)。本研究表明，浒苔多糖的添加增强了海藻酸钠膜的机械性能和阻隔性能。

英文摘要:

      Owing to its non-toxicity, excellent biodegradability, film-forming property, and biocompatibility, sodium alginate (SA) is used as a common and promising raw material for biopolymer films. However, pure SA films tend to have defects in performance and functionality; therefore, blend films, consisting of two or more types of components, are more widely used as precursors for biopolymer films. To investigate the synergy between SA and Enteromorpha polysaccharide (EP), a degradable composite film was fabricated by blending SA and EP with glycerol as a plasticizer. The effect of different polysaccharide mass ratios, total mixed solution concentrations, and glycerol contents on the tensile strength, elongation at break, water vapor permeation, and water solubility of the films was investigated. In addition, the microstructure of the films was characterized through Fourier transform infrared spectroscopy and scanning electron microscopy. Results showed a good compatibility and synergy between SA and EP. Moreover, no obvious phase separation was observed in all SA/EP composite films. The component mass ratio, total concentration, and glycerol content had a significant influence on the properties of composite films. Among these factors, mass ratio had the most significant influence on the films. The addition of an appropriate amount of EP improved the tensile strength and elongation at break of the SA film and reduced its water vapor transmission rate; however, it slightly increased the water solubility of the SA/EP composite film. When the component mass ratio was modified from 10:0 to 8:2, the tensile strength increased from 99.22 MPa to 108.41 MPa, the elongation at break increased from 5.14% to 6.20%, and the water vapor transmission rate decreased from 6.445×10–11 g/(m·s·Pa) to 6.027×10–11 g/(m·s·Pa), which were the comprehensive optimal mechanical and barrier properties of the films. The total concentration and glycerol content of the SA/EP composite films were further optimized. The best total concentration and glycerol content were 1.6% (m/v) and 0.9% (m/v), respectively. The results demonstrate that the addition of EP enhanced the mechanical and barrier properties of the SA films and that there is a relatively strong synergistic effect between SA and EP.