Liu Xinxin, Chen Xiaofeng, Ren Junli, Zhang Chunhui
State Key Laboratory of Pulp and Paper Engineering, School of Light Industry and Engineering, South China University of Technology, Guangzhou 510640, China.
Materials (Basel). 2018 Sep 2;11(9):1589. doi: 10.3390/ma11091589.
In order to improve the strength of polyvinyl alcohol (PVA)/xylan composite films and endow them with ultraviolet (UV) shielding ability, TiO₂-KH550 nanoparticles was synthesized and added into the PVA/xylan matrix. The TiO₂-KH550 nanoparticle dispersed well in the 0.04% sodium hexametaphosphate (SHMP) solution under ultrasonic and stirring treatments. Investigations on the properties of the films showed that TiO₂-KH550 had the positive impact on improving the strength, moisture, and oxygen barrier properties of the composite films. The maximum tensile strength (27.3 MPa), the minimum water vapor permeability (2.75 × 10 g·m·s·Pa), and oxygen permeability (4.013 cm³·m·24 h·0.1MPa) were obtained under the addition of 1.5% TiO₂-KH550. The tensile strength of TiO₂-KH550 reinforced composite film was increased by 70% than that of the pure PVA/xylan composite film, and the water vapor and oxygen permeability were decreased by 31% and 41%, respectively. Moreover, the UV transmittance of the film at the wavelength of 400 nm was almost zero when adding ≈1.5~2.5% (weight ratio, based on the total weight of PVA and xylan) of TiO₂-KH550, which indicated the PVA/xylan composite films were endowed with an excellent UV light shielding ability.
为了提高聚乙烯醇（PVA）/木聚糖复合薄膜的强度并赋予其紫外线（UV）屏蔽能力，合成了TiO₂-KH550纳米颗粒并将其添加到PVA/木聚糖基质中。在超声和搅拌处理下，TiO₂-KH550纳米颗粒在0.04%的六偏磷酸钠（SHMP）溶液中分散良好。对薄膜性能的研究表明，TiO₂-KH550对提高复合薄膜的强度、防潮性和氧气阻隔性能有积极影响。在添加1.5%的TiO₂-KH550时，获得了最大拉伸强度（27.3MPa）、最小水蒸气透过率（2.75×10 g·m·s·Pa）和氧气透过率（4.013 cm³·m·24 h·0.1MPa）。TiO₂-KH550增强复合薄膜的拉伸强度比纯PVA/木聚糖复合薄膜提高了70%，水蒸气和氧气透过率分别降低了31%和41%。此外，当添加约1.5~2.5%（重量比，基于PVA和木聚糖的总重量）的TiO₂-KH550时，薄膜在400nm波长处的紫外线透过率几乎为零，这表明PVA/木聚糖复合薄膜具有优异的紫外线屏蔽能力。
