Hydrogen-bonding assembly of heteropolyacid and poly(vinyl alcohol) for strong, flexible, and transparent UV-protective films
Hydrogen-bonding assembly of heteropolyacid and poly(vinyl alcohol) for strong, flexible, and transparent UV-protective films
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杂多酸和聚乙烯醇的氢键组装可形成坚固、柔韧、透明的紫外线防护薄膜
DOI：
10.1002/app.48813
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发表时间：
2019
影响因子：
3
通讯作者：
Zou Zhiming
中科院分区：
文献类型：
--
作者：
Zhang Ziang;Chen Kui;Tang Qun;Li Heping;Zou Zhiming
尽管已经开发了许多制备方法，但要获得兼具高透明度、优异UV屏蔽性和机械性能的联合收割机紫外（UV）防护膜仍然是一个巨大的挑战。在此，我们展示了一种简单且生态友好的工艺，通过利用硅钼酸（SiMoA）作为紫外线吸收剂和增强相来制造坚固，柔性和透明的紫外线防护聚乙烯醇（PVA）薄膜。傅里叶变换红外分析证实了PVA和SiMoA之间形成了强氢键相互作用。随着SiMoA含量的增加，复合膜的玻璃化转变温度、力学性能和紫外屏蔽稳定性明显提高。通过仅掺入2wt%的SiMoA，防紫外线PVA复合膜可以在整个UV区域阻挡超过90%的UV光，并保持高可见光透明度（高达95%）。同时，防紫外线PVA复合膜具有优异的机械性能，拉伸强度为65.2 MPa，断裂伸长率为172.6%，分别比纯PVA膜提高了72.0%和69.5%。该工作为通过氢键组装制备高强度、柔性、透明的紫外线阻隔高分子材料提供了一种简单有效的方法，有望在紫外线防护领域具有广泛的应用前景。© 2019 Wiley Periodicals，Inc. J.应用聚合物Sci.2020，137，48813.
Although many preparation approaches have been developed, it remains a huge challenge to achieve ultraviolet (UV)‐protection films that combine high transparency, excellent UV‐shielding, and mechanical properties. Herein, we demonstrate a facile and eco‐friendly process for fabricating strong, flexible, and transparent UV‐protective poly(vinyl alcohol) (PVA) films by exploiting silicomolybdic acid (SiMoA) as UV absorber and reinforcing phase. Fourier‐transform infrared analysis confirms the formation of strong hydrogen‐bonding interactions between PVA and SiMoA. The glass‐transition temperature, mechanical properties, and UV‐shielding stability of the UV‐protective PVA composite films obviously increase with increasing the content of SiMoA. By incorporation of only 2 wt % SiMoA, the UV‐protective PVA composite film can block more than 90% of UV light in the entire UV regions and retain high visible light transparency (up to 95%). Simultaneously, the UV‐protective PVA composite film presents excellent mechanical properties with a tensile strength of 65.2 MPa and an elongation at break of 172.6%, which are 72.0 and 69.5% higher than that of pristine PVA films. This work provides a simple but effective approach for creating strong, flexible, and transparent UV‐blocking polymeric materials via hydrogen‐bonding assembly, which are expected to have wide application prospects in UV‐protection field. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2020,137, 48813.