改性二氧化硅/乙基纤维素复合膜的制备及性能

Preparation and properties of modified silica/ethyl cellulose composite film

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EC-Six(x=1、2、3、4)。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,并与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 g·mm/(m^2·h·kPa)。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。

Ethyl cellulose(EC) and modified silica(m-SiO2) were proposed for preparing composite film EC-Six(x=1、2、3、4) by the blending casting method. The microstructure of the composite film was characterized by SEM and FTIR. 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 5.405%, respectively. The water vapor transmission coefficient(WVP) of the film was 0.549 g·mm/(m^2·h·kPa). 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.