为了探究壳聚糖复合膜透性的调节,采用共混的方法制备了纳米SiOx/壳聚糖复合膜,并用X-射线衍射(XRD)和透射电镜(TEM)对复合膜微观结构进行表征,同时考察纳米SiOx添加量、环境温度和相对湿度对透性的影响。结果表明:当纳米SiOx为0.03 g/100 mL时,纳米SiOx分散均匀,与壳聚糖结合紧密,形成强烈的氢键相互作用,对复合膜透性的影响最显著,对呼吸强度的抑制最强;添加等量的纳米SiOx,一定相对湿度下,温度越低,O2透过系数(OP)、CO2透过系数(CP)和水蒸气透过系数(WVP)越低;一定温度下,相对湿度越高,WVP越高;适量纳米SiOx对透光率(LT)的影响较小。可见通过控制壳聚糖膜中纳米SiOx的量,改变环境温度和相对湿度,能对复合膜OP、CP和WVP进行有效调节。

To explore adjustable characteristic of permeability of chitosan composite films,the chitosan composite films were prepared by blending method. Nano-SiOxcontent,the ambient temperature and relative humidity( RH) on permeability of the regulation were investigated. It is confirmed that hydrogen bonds emerge between chitosan and SiOxby hybrid materials X-ray diffraction( XRD) and transmission electron microscopy( TEM) analysis. The addition of 0. 03 g /100 mL nano-SiOxwas dispersed well in chitosan composite films,and effect of nano-SiOxcontent to permeability and respiratory intensity was very significant. Adding the same amount of nano-SiOxand lowered the temperature,O2permeability( OP),CO2permeability( CP) and water vapor permeability( WVP) all got decreased lower in certain humidity. The water vapor permeability of chitosan composite films increases with an increase in relative humidity at certain temperature. Nano-SiOxcontent has little effect to light transmittance( LT) of the composite film.It is concluded that OP,CP and WVP of the chitosan composite membranes can be regulated through the control of the amount of nano-SiOx,temperature and relative humidity.