改性二氧化硅-乙基纤维素复合膜的制备及性能

Preparation and structure characterization of modified silica-ethyl cellulose composite film

摘要:

乙基纤维素（EC）与改性二氧化硅(m-SiO2)醇溶胶通过共混方式制备了复合膜。通过SEM、FTIR对复合膜的微观结构进行了表征，对复合膜的水接触角、机械性能和水蒸气透过系数（WVP）进行了测试。结果表明：当m-SiO2醇溶胶与EC醇溶液体积比为3︰2时，纳米粒子均匀地分布于复合膜EC-Si3中，与EC形成均一的多孔状结构。该复合膜具有很好的表面疏水性，膜表面水静态接触角（WCA）可达145°。复合膜的抗张强度（TS）为10.452 MPa，断裂伸长率（EB）为5.405%，其WVP值为0.549 gmm/m2hkPa。抗菌剂的释放性结果表明，EC-Si3膜中姜黄素在正己烷中的释放率高于在蒸馏水中的释放率。基于以上特性，该膜有望作为包装材料用于脂类食品的保藏。

Abstract:

Ethyl cellulose (EC) and modified silica(m-SiO2) were proposed for preparing composite film by the blending casting method. The microstructure of the composite film was characterized by SEM and FT-IR. The physical and chemical properties of films were investigated. The results showed that the nanoparticles were uniformly distributed in the film to form a uniform porous structure when the volume ratio of the m-SiO2 alcohol sol to the EC alcohol solution was 3:2. The film material showed good surface hydrophobicity and the water static contact angle (WCA) of it could reach 145°. The tensile strength(TS) and elongation at break(EB) of the film were 10.452 MPa and 5.40 %, respectively. The water vapor transmission coefficient (WVP）of the film was 0.549 gmm/m2hkPa. For the film(EC-Si3) , the release rate of the curcumin in n-hexane simulation solution was higher than that in the distilled water. Based on the above characteristics, the film was expected to be used as a packaging material for lipid foods.