羧甲基纤维素钠纳米抗菌复合膜的制备及其性能研究

Study on the preparation and characterization of antibacterial sodium carboxymethyl cellulose nanocomposite film

以羧甲基纤维素钠(CMC-Na)为基质,添加天然抗菌剂肉桂醛和纳米蒙脱土(MMT),通过溶液流延成膜法制备不同MMT含量的纳米抗菌复合膜,研究纳米MMT含量对复合膜的机械性能、水蒸气透过率、透明度、肉桂醛释放能力及抗菌性的影响。结果表明膜的拉伸强度和断裂伸长率都随着MMT含量的升高而先增加后降低,在MMT含量为4%时,拉伸强度达最大。水蒸气透过率和透明度随MMT含量的增加逐渐降低;并且MMT能有效限制肉桂醛在膜中的扩散和释放,使肉桂醛释放速率变慢,随着存放时间的延长,含MMT的膜保持较高的抗菌性活性,而不含MMT的膜,肉桂醛挥发较多,抗菌性大大降低。结论:纳米蒙脱土能有效控制肉桂醛在羧甲基纤维素钠膜中的释放。

Sodium carboxymethyl cellulose （CMC-Na）- based nanocomposite films with natural antibacterial cinnamaldehyde and different contents of nano-montmorillonite （MMT）were fabricated by film-casting method. The effects of MMT content on mechanical properties, water vapor transmittance, transparency, cinnamaldehyde release ability and antimicrobial properties of the films were studied.The results showed that the tensile strength and elongation at break of the were film increased first and then decreased with the increase of MMT content,and the tensile strength reached the maximum at 4% MMT content.Water vapor transmittance and transparency were reduced gradually with the increase of the MMT content. MMT was good barrier to the diffusion and release of cinnamaldehyde in film.The CMC-Na films containing MMT maintained high antibacterial activity with the extension of storage time, and the antibacterial activity of films without MMT was reduced greatly because more cinnamaldehyde volatilized. Conclusion： nano montmorillonite can effectively control the release of cinnamon in CMC-Na film.