Hydrogen‐bonding assembly of heteropolyacid and poly(vinyl alcohol) for strong, flexible, and transparent UV‐protective films

ABSTRACT 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 stro...

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Bibliographic Details
Published inJournal of applied polymer science Vol. 137; no. 24
Main Authors Zhang, Ziang, Chen, Kui, Tang, Qun, Li, Heping, Zou, Zhiming
Format Journal Article
LanguageEnglish
Published Hoboken, USA John Wiley & Sons, Inc 20.06.2020
Wiley Subscription Services, Inc
Subjects
Assembly
biodegradable
Blocking
Bonding strength
Elongation
films, surfaces and interfaces
Hydrogen
Infrared analysis
Materials science
Mechanical properties
optical properties
Phase transitions
Polymers
Polyvinyl alcohol
Shielding
Tensile strength
Transition temperature
Ultraviolet radiation
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Summary:ABSTRACT 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.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.48813