Florida橘油-壳聚糖复合膜的制备及表征

Preparation and Characterization of Florida Mandarin Oil-chitosan Composite Films

摘要:

使用浇铸-蒸发-碱浸法制备了壳聚糖（CS）膜和Florida橘油（FMO）-壳聚糖复合膜。采用FT-IR、XRD对膜的微观结构进行了表征，分析了FMO添加量对膜的厚度、拉伸强度、断裂伸长率、接触角、水蒸气透过系数、总溶解物含量等性质的影响。结果表明，FMO橘油的成分占据了壳聚糖骨架中的部分官能团的位置，影响着壳聚糖共价键的振动强度；FMO的添加，并增大了膜中壳聚糖乙酸盐的含量，并使膜的拉伸强度降低；FMO添加量为4%时，膜的厚度达到最小值19.80±0.21 μm，断裂伸长率达到最大值2.81±0.01%；FMO添加量为10%时，膜的厚度达到最大值26.90±0.22 μm。FMO添加量为2%时，膜的水蒸气透过系数达到最小值305.33±3.69 mg?mm/(kPa?h?m2)；膜的接触角和总溶解物含量都随FMO添加量的增加而增大，最大值分别为81.80±0.09°和2.96±0.05%。研究结果为FMO-CS复合膜的实际应用提供了理论依据。

Abstract:

Chitosan (CS) films and Florida mandarin oil (FMO) -chitosan composite films were prepared by casting-evaporation-alkali leaching method. Microstructures of films were characterized by FTIR, XRD, and the influences of FMO content on thickness, tensile strength, elongation at break, water contact angle, water vapour permeability, and total soluble matter content of films were determined. The results indicated that the locations of some functional groups of CS matrix were occupied by FMO ingredients, which affected vibration intensity of covalent bond of CS. Increase of chitosan acetate content and decrease of film tensile strength were caused by incorporation of FMO. When FMO content was 4%, film thickness reached the minimum (19.80±0.21 μm) and elongation at break reached the maximum (2.81±0.01%). When FMO content increased to 10%, the film thickness attained the largest (26.90±0.22 μm). When adding 2% FMO, the lowest water vapour permeability was obtained, which was 305.33±3.69 mg?mm/(kPa?h?m).Water contact angle and total soluble matter content of films increased with increasing FMO content, and the maximums were 81.80±0.09 and 2.96±0.05%, respectively. The research results could provide theoretical basis for the application of FMO-CS composite films.