Bio-inspired natural polyphenol cross-linking poly(vinyl alcohol) films with strong integrated strength and toughness

Guan, Yu; Shao, Leishan; Dong, Dongyu; Wang, Fei; Zhang, Yuliang; Wang, Yinghan

doi:10.1039/c6ra08904f

Cited by 57 publications

(55 citation statements)

References 45 publications

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“…The reduction of T m can be interpreted by the phase equilibrium theory in which SiMoA plays the role of an impurity to reduce the melting point. The similar results have been found for other PVA‐based molecular composites, such as PVA/tannic acid and PVA/polyhexamethylene guanidine (PHMG) composites . Simultaneously, T g is raised to 76.2 °C for PVA‐2.0, about 2.4 °C higher than that of neat PVA.…”

Section: Resultssupporting

confidence: 83%

“…The results indicate that SiMoA can function as a highly effective reinforcing agent for PVA matrix. Similar reinforcing effects have also been observed in other PVA‐based molecular composites, such as PVA/tannic acid and PVA/poly( p ‐sulfophenylene terephthalamide) (sPPTA) composites . The remarkable enhancement in both the tensile strength and elongation at break of PVA/SiMoA composite films should be ascribed to the strong hydrogen‐bonding interaction between SiMoA and PVA (Scheme ), which not only ensures efficient stress transfer at the interface but also retards the failure of PVA composite films during tensile process .…”

Section: Resultssupporting

confidence: 64%

“…From the FTIR spectrum of neat PVA, the broad absorption peak at around 3371 cm −1 is attributed to O─H stretching vibration . The absorption peaks at 2938 cm −1 and 2913 cm −1 are corresponding to ─CH 2 ─ stretching vibration . The FTIR spectrum of pure SiMoA shows distinct absorption peaks at approximately 3423, 956, and 906 cm −1 , which are ascribed to the vibrations of O─H, the terminal Mo─O, and Si─O─Mo bonds, respectively .…”

Section: Resultsmentioning

confidence: 98%

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

Zhang

Chen

Tang

et al. 2019

J of Applied Polymer Sci

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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.

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Section: Resultssupporting

confidence: 83%

Section: Resultssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 98%

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

Zhang

Chen

Tang

et al. 2019

J of Applied Polymer Sci

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“…The tensile strength of a tannic acid/chitosan film was superior to that of a chitosan film, revealing a mechanical reinforcement of ≈29%. Likewise, the tensile strength of a PVA film (≈60 MPa) was increased by the integration of tannic acid (5 wt%), reaching up to ≈98 MPa . We can anticipate from these results that pyrogallol analogs such as EGCG or tannic acid effectively entangle between polymeric chains via binding to hydrogen bonding partners such as OH groups tethered onto backbones.…”

Section: Intermolecular Interaction Of Pyrogallol Analogs With Macrommentioning

confidence: 79%

“…The incorporation of pyrogallol analogs into polymeric films often reinforces their mechanical strength because of the formation of networks with polymer chains via noncovalent bonds. Examples of composite films include tannic acid‐crosslinked gelatin, chitosan, and poly(vinyl alcohol) (PVA) films . These tannic acid/polymer films are prepared by a solvent casting method.…”

Section: Intermolecular Interaction Of Pyrogallol Analogs With Macrommentioning

confidence: 99%

Plant‐Inspired Pyrogallol‐Containing Functional Materials

Shin

Park

Lee

2019

Adv Funct Materials

143

106

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Pyrogallol-containing molecules are ubiquitous in the plant kingdom. The chemical synthesis of these molecules remains challenging. Thus, they are obtained via purification from heterogeneous mixtures of plant extracts. Previous studies have focused on their biological roles, such as antioxidants. Additionally, the molecules are used as ink colorants and in tanning processes for leather. Recently, many disciplines have paid attention to adhesiveness of pyrogallol-containing molecules, including the control of interface properties in energy storage/generation and medical devices, as well as the changes in wettability related to membrane technologies. In particular, pyrogallol-containing molecules act as "molecular glues," binding to virtually all biomacromolecules, for example, DNA/RNA, soluble proteins, insoluble extracellular matrices, and peptides. Furthermore, the cohesion of pyrogallol by forming pyrogallol-to-pyrogallol covalent bonds is useful for the preparation of bulk hydrogels and thin films. The content of this review focuses on interactions with biomacromolecules used as molecular glues, used as modifiers in material-independent surface chemistry, and applied as chemical moieties to form covalent linkages to fabricate hydrogels and related biomaterials. Future perspectives include the development of new pyrogallol-containing materials, the understanding of chirality in adhesion, and the improvement of the mechanical stability for applications in various biomedical, energy, and industrial devices. molecules, strategies for surface modifications, and biomedical applications (Figure 1). Based on the timeline of pyrogallol research, we begin by describing the basic physicochemical properties of pyrogallol analogs, focusing on intermolecular interactions with macromolecules. Section 2 introduces the chemical versatility of pyrogallol analogs in macromolecular complexation, and analytical methods for the complexation are explained. Furthermore, the biological functions of pyrogallol analogs, particularly their therapeutic effects on cancers and inflammatory diseases, are explained. Next, surface modification strategies using pyrogallol-containing molecules are explained (Section 3). We discuss pyrogallol-derived formulations for biomedical purposes, ranging from hydrogels to particles (Section 4). Finally, we conclude with an outlook for the further development and implementation of natural pyrogallol analogs and pyrogallol-conjugated synthetic polymers. This review will be helpful for understanding past studies and current progress in pyrogallol-containing molecules research and for predicting future perspectives. Chemical and Structural Analysis of Colloidal ComplexationEarly uses largely involved intermolecular interactions between pyrogallol analogs and proteins. Pyrogallol analog complexations were particularly effective in studies of proline-rich proteins (PRPs)

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High‐Performance Polymeric Materials through Hydrogen‐Bond Cross‐Linking

2019

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to traditional metallic and ceramic materials. [1] Therefore, it has been desirable to create high-performance polymeric materials that are mechanically robust, thermostable, and even healable for meeting practical applications in industry. The creation of cross-linked polymers has been regarded as one promising approach for creating strong and thermally stable polymers. [3][4][5] Cross-linked polymers normally exhibit superior mechanical and thermostable performances to their uncrosslinked counterparts. [6][7][8][9][10] Traditionally, a chemically covalent approach has been the primary means for realizing the cross-linking of polymeric materials. As compared with the parent polymer, cross-linked polymers normally gain enhanced mechanical strength and thermal stability. [6][7][8][9][10][11] This strategy, however, gives rise to significantly reduced extensibility because of the exclusive molecular mechanism between strength, extensibility, and toughness. [12][13][14][15] By contrast, noncovalent cross-linking can lead to increased mechanical strength without sacrificing the extensibility and toughness of polymeric materials. Such cross-linking can be realized by adopting strong noncovalent interactions including Coulombic interactions, [11] dipoledipole interactions, [12] metal coordination, [13] and hydrogenbonding (H-bonding) interactions. [5,16] To date, H-bonding is among the most extensively employed noncovalent interactions for the creation of cross-linked polymeric materials with tunable microstructure and tailor-made performances because of its directionality, versatility, and reversibility. In 1997, Meijer and co-workers [17] pioneered the synthesis of the first reversible cross-linked polymer by reacting a trifunctional copolymer of hydroxyl-terminated poly(propylene oxide) with diisocyanate and then 2-ureido-4-pyrimidone (UPy) units capable of forming quadruple H-bonds. The final poly mer shows a relatively high plateau modulus because such H-bond cross-links can serve as entanglements in a linear polymer. Following the synthesis of some uncross-linked polymeric materials containing UPy motifs, [17][18][19] Meijer's group has further synthesized many cross-linked polymeric materials based on UPy motifs. [20][21][22] On the other hand, in many natural biological materials, such as silk [23][24][25][26] and muscle, [27] multiple H-bonding interactions have recently been revealed to play a critical part in realizing a unique combination of high strength, great It has always been critical to develop high-performance polymeric materials with exceptional mechanical strength and toughness, thermal stability, and even healable properties for meeting performance requirements in industry. Conventional chemical cross-linking leads to enhanced mechanical strength and thermostability at the expense of extensibility due to mutually exclusive mechanisms. Such major challenges have recently been addressed by using noncovalent cross-linking of reversible multiple hydrogen-bonds (H-bonds) that widely exist in biological...

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Bio-inspired natural polyphenol cross-linking poly(vinyl alcohol) films with strong integrated strength and toughness

Abstract: Bio-inspired by spider silk, we simultaneously integrated high strength and toughness to PVA/TA films via extensive hydrogen bonding interactions.

Cited by 57 publications

References 45 publications

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

Plant‐Inspired Pyrogallol‐Containing Functional Materials

High‐Performance Polymeric Materials through Hydrogen‐Bond Cross‐Linking

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