Preparation and properties of a polyurethane film based on novel photochromic spirooxazine chain extension

Gao, Hongwu; Liu, Guojie; Cui, Congcong; Wang, Min; Gao, Jun

doi:10.1039/d2nj00162d

Cited by 30 publications

(7 citation statements)

References 46 publications

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“…Additionally, extended exposure to light can decrease the photostability of organic agents. 17 On the other hand, inorganic agents offer better photochromism and photostability since they do not undergo steric effects. Strontium aluminate has superior reversibility compared with other phosphors due to its outstanding photostability.…”

Section: Introductionmentioning

confidence: 99%

“…Immobilization of organic agents into a material limits the photochromic performance of such organic pigments due to steric hindrance generating from the structural switching that occurs in reaction to light. Additionally, extended exposure to light can decrease the photostability of organic agents 17 . On the other hand, inorganic agents offer better photochromism and photostability since they do not undergo steric effects.…”

Section: Introductionmentioning

confidence: 99%

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Reinforcement of styrene‐acrylonitrile polymer bulk with glass nanofibers to introduce photoluminescent bricks

Abd El‐Lateef,

Khalaf,

Abou Taleb

et al. 2024

J of Applied Polymer Sci

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Transparent and mechanically reliable plastic was developed by reinforcing styrene‐acrylonitrile polymer (SAP) with electrospun glass nanofibers (EGN). The physical inclusion of strontium aluminate nanoparticles (SAN) produced long‐persistent photoluminescent and photochromic EGN@SAP bricks or smart windows. EGN were fabricated by electrospinning technique and incorporated as a toughening mediator into styrene‐acrylonitrile plastic to boost its mechanical properties. Transparency of EGN@SAP with the capacity to shift to green under ultraviolet (UV) illumination was verified using photoluminescence analysis and CIE Lab parameters. EGN@SAP with low content of SAN exhibited immediate reversibility of the photochromic feature, proving fluorescence emission. Afterglow emission from EGN@SAP embedded with high concentration of SAN persisted for longer time and was less easily reversed. After excitation at 365 nm, the emission peaked at 519 nm. Increasing the SAN content resulted in improved hydrophobicity and UV protection. Diameter measurements of SAN (6–14 nm) and EGN (75–300 nm) were taken utilizing transmission electron microscopy and scanning electron microscopy, respectively. EGN and EGN@SAP bricks were analyzed for their morphological characteristics using a variety of analytical techniques. The scratch resistance of EGN@SAP bricks containing SAN was enhanced in comparison to SAN‐free EGN@SAP bricks.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reinforcement of styrene‐acrylonitrile polymer bulk with glass nanofibers to introduce photoluminescent bricks

Abd El‐Lateef,

Khalaf,

Abou Taleb

et al. 2024

J of Applied Polymer Sci

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“…[ 2b,3e ] The most commonly used method is to disperse SO into particular solid matrixes. [ 17,18 ] This is an efficient method to inhibit the intermolecular π–π stacking of SO and thus provide enough volume for photochemical reaction, but it still has some drawbacks, such as complicated manufacture procedures, limited addition amounts, uneven addition, poor stability, and the leakage of photochromic molecules from the solid matrix. Solid‐state photochromism of SO can also be moderately achieved at a very low temperature such as ‐183 °C, [ 19 ] upon irradiation with highly intense laser light [ 20 ] or prolonged UV irradiation for up to 20–30 min.…”

Section: Introductionmentioning

confidence: 99%

Tunable Photochromism of Spirooxazine in the Solid State: A New Design Strategy Based on the Hypochromic Effect

Zhang

Lou

et al. 2023

Advanced Materials

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As an important organic photofunctional material, spirooxazine (SO) usually does not exhibit photochromism in the solid state since the intermolecular π–π stacking impedes photoisomerization. Developing photochromic SO in the solid state is crucial for practical applications but is still full of challenges. Here, a series of spirooxazine derivatives (SO1–SO4) with bulky aromatic substituents at the 4‐ and 7‐positions of the skeleton, which provide them with a large volume with which to undergo solid‐state photochromism under mild conditions, is designed and synthesized. All the compounds SO1–SO4 exhibit tunable solid photochromism without ground colors, excellent fatigue resistance, and high thermal stability. Notably, it takes only 15 s for SO4 to reach the saturation of absorption intensity, thought to represent the fastest solid‐state photoresponse of spirooxazines. X‐ray crystal structures of the intermediate compound SO0 and the products SO1–SO2 as well as computational studies suggest that the bulky aromatic groups can lead to a hypochromic effect, allowing for the photochromism of SO in the solid state. The ideal photochromic properties of these spirooxazines open a new avenue for their applications in UV printing, quick response code, and related fields.

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“…[19][20][21] Moreover, polyurethane is a kind of materials easy to be synthesized with adjustable structures, and fluorescent groups can be directly introduced into the backbone of polyurethane via the chain expansion process, which is expected to expand functional anti-counterfeiting materials based on the original industrial applications and provide photochromic properties. [22][23][24][25] Besides, polyurethane material contains hydrogen bonds within the polymer, resulting in good adhesion to most materials such as metal and glass, which is beneficial for used as coating.…”

Section: Introductionmentioning

confidence: 99%

Photochromic Polyurethane Coatings with Cross‐Linked Structure and Self‐Healing Behavior Based on the FRET Effect

Liu

Tian

et al. 2023

Macromol. Rapid Commun.

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Intelligent fluorescent coatings have received widespread attention in the encryption technique field such as anti‐counterfeit, while the traditional fluorescent coatings are easy to be damaged by external force. In this study, the fluorescent and self‐healing anti‐counterfeit coatings are prepared after rational molecular design. Two polymers containing fluorescent groups, including polyurethane containing the anthracene (AN) side group and polyimide containing the naphthalenediimide (NDI) structure are synthesized to realize multiple color changes with fluorescence through simply blending. Due to the overlapping fluorescence spectra of the groups, enabling the fluorescence resonance energy transfer effect (FRET), the coating with different group ratios exhibits tunable fluorescence under the same excitation light, providing diverse patterns. Moreover, due to the reversible photo‐crosslinking and thermal de‐dimerization properties of anthracene, the recording, erasure, and rewriting of the surface pattern can be realized, and the fluorescent anti‐counterfeit coatings exhibit excellent self‐healing properties after cross‐linking due to the FRET effect, which solves the problem of poor healing and ensures the stability and integrity. The fluorescent coating with cross‐linked structure and self‐healing behavior based on the FRET effect greatly expands the functional applications of traditional polyurethane materials.

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Preparation and properties of a polyurethane film based on novel photochromic spirooxazine chain extension

Abstract: A smart polyurethane material with good photoresponsiveness and reversible surface wettability based on a photoresponsive chain extender (SO–OH).

Cited by 30 publications

References 46 publications

Reinforcement of styrene‐acrylonitrile polymer bulk with glass nanofibers to introduce photoluminescent bricks

Reinforcement of styrene‐acrylonitrile polymer bulk with glass nanofibers to introduce photoluminescent bricks

Tunable Photochromism of Spirooxazine in the Solid State: A New Design Strategy Based on the Hypochromic Effect

Photochromic Polyurethane Coatings with Cross‐Linked Structure and Self‐Healing Behavior Based on the FRET Effect

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