Xu Ji-Dong, Niu Ya-Shuai, Yue Pan-Pan, Hu Ya-Jie, Bian Jing, Li Ming-Fei, Peng Feng, Sun Run-Cang
Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
Materials (Basel). 2018 Nov 13;11(11):2264. doi: 10.3390/ma11112264.
Wood auto-hydrolysates (WAH) are obtained in the pulping process by the hydrothermal extraction, which contains lots of hemicelluloses and slight lignin. WAH and chitosan (CS) were introduced into this study to construct WAH-based films by the casting method. The FT-IR results revealed the crosslinking interaction between WAH and CS due to the Millard reaction. The morphology, transmittance, thermal properties and mechanical properties of composite WAH/CS films were investigated. As the results showed, the tensile strength, light transmittances and thermal stability of the WAH-based composite films increased with the increment of WAH/CS content ratio. In addition, the results of oxygen transfer rate (OTR) and water vapor permeability (WVP) suggested that the OTR and WVP values of the films decreased due to the addition of CS. The maximum value of tensile strengths of the composite films achieved 71.2 MPa and the OTR of the films was low as 0.16 cm³·μm·m·24 h·kPa, these properties are better than those of other hemicelluloses composite films. These results suggested that the barrier composite films based on WAH and CS will become attractive in the food packaging application for great mechanical properties, good transmittance and low oxygen transfer rate.
木材自水解产物（WAH）是在制浆过程中通过水热萃取获得的，其中含有大量半纤维素和少量木质素。本研究引入WAH和壳聚糖（CS），采用流延法制备基于WAH的薄膜。傅里叶变换红外光谱（FT-IR）结果表明，由于美拉德反应，WAH与CS之间存在交联相互作用。研究了复合WAH/CS薄膜的形态、透光率、热性能和力学性能。结果表明，基于WAH的复合薄膜的拉伸强度、透光率和热稳定性随着WAH/CS含量比的增加而提高。此外，氧气透过率（OTR）和水蒸气透过率（WVP）结果表明，由于添加了CS，薄膜的OTR和WVP值降低。复合薄膜的拉伸强度最大值达到71.2 MPa，薄膜的OTR低至0.16 cm³·μm·m·24 h·kPa，这些性能优于其他半纤维素复合薄膜。这些结果表明，基于WAH和CS的阻隔复合薄膜因其优异的力学性能、良好的透光率和低氧气透过率，在食品包装应用中将具有吸引力。
