POSS对壳聚糖膜的阻湿与拉伸性能的影响

目的研究以四甲基铵基笼形聚倍半硅氧烷(Octa TMA POSS)为填料,制备壳聚糖基复合膜,对壳聚糖薄膜的水蒸气阻隔性能和力学性能进行改善。方法采用溶液共混流延法制备复合膜,测定其水蒸气透过系数、表面接触角、溶胀度、溶解度、吸附等温曲线、拉伸性能、成膜液流变性能、微观形貌和X射线衍射等。结果笼形聚倍半硅氧烷的加入可提高复合膜对水分子的阻隔性,尤其是质量分数为3%时,其水蒸气透过系数下降了15.9%。同时,壳聚糖薄膜的力学性能也得到改善,在质量分数低于5%时,壳聚糖薄膜的抗拉强度、弹性模量可同时得到提高。结论四甲基铵基笼形聚倍半硅氧烷的加入可改善壳聚糖薄膜的阻湿性能和力学性能,可大大提升其在食品包装领域的应用潜力。

Effects of POSS Content on the Water Barrier Properties and Tensile Properties of Chitosan Films

Octa TMA POSS (POSSA) is used as a nano-filler for chitosan films to improve their water barrier and mechanical properties. The composite films prepared by solution-blending were characterized by water vapor permeability measurement, contact angle, swelling and solubility test, adsorption isotherm, tensile test, rheological test, SEM, as well as XRD. The results indicated that the water vapor permeability (WVP) of the composite films decreased with the addition of POSSA. Particularly, when the loading amount of POSSA was 3%, WVP of the composite films was 15.9% lower than that of the pure chitosan film. The tensile properties of the chitosan films were also improved considerably with the addition of POSSA. When the loading was less than 5%, the tensile strength and MOE of the composite films were improved. In conclusion, addition of POSSA is able to improve the water barrier properties and mechanical properties of chitosan film, thus making it a good candidate for food packaging applications.