Solvent-free microwave-assisted synthesis and characterization of polybenzoxazine as a thermochromic material for smart coatings

Mehta, Linchon B.; Wadgaonkar, Kunal K.; Suryawanshi, Milind; Jagtap, R. N.

doi:10.1007/s00396-019-04491-9

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…According to whether the thermochromic ink can be recovered after discoloration, it can be divided into reversible thermochromic ink and irreversible thermochromic ink. In recent years, thermochromic materials have been extensively researched because of their potential applications in anti-counterfeiting signs, temperature indicators, wearable electronic devices, medical diagnostics, safety materials, aerospace and other fields [1][2][3][4][5][6][7][8]. Thermochromic material has special thermal memory function, and the color of compounds and mixtures will change significantly during heating or cooling [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Reversible Thermochromic Ink based on Crystal Violet Lactone/Boric Acid/Hexadecyl Alcohol for Anti-Counterfeiting Printing

Liu¹,

Zhang²,

Chen³

et al. 2022

jist

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The purpose of the study is to prepare reversible thermochromic materials with good discoloration properties, which are used as fillers to prepare a new type of reversible thermochromic ink. Reversible thermochromic materials were prepared by solid phase method with crystal violet lactone as chromogenic agent, boric acid as chromogenic agent and hexadecanol as cosolvent, and reversible thermochromic ink was prepared by using thermochromic material as filler. The scanning electron microscope images of reversible thermochromic materials showed that the prepared materials were spherical and had the advantages of non-adhesion. The printability of reversible thermochromic ink was discussed by changing the parameters including content of thermochromic material, printing pressure, ink sequence and using printability tester. The test of color change performance of thermochromic ink showed that the color change temperature range was 47.5–51.1 ◦ C, the color change time was 46 s, the recolor time was 29 s, and the stability was excellent. The reversible thermochromic ink has a certain application value in anti-counterfeiting printing.

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Section: Introductionmentioning

confidence: 99%

Reversible Thermochromic Ink based on Crystal Violet Lactone/Boric Acid/Hexadecyl Alcohol for Anti-Counterfeiting Printing

Liu¹,

Zhang²,

Chen³

et al. 2022

jist

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“…31,32 There are multiple conditions that a reactive diluent for UPRs applications must satisfy, for example, low volatility, adequate dissolving capacity, and controllable copolymerizability with the UPPs. 33,34 Despite a number of reactive diluents such as methyl methacrylate, 35,36 acrylated epoxidized soybean oil, [37][38][39] itaconates, 40,41 and vinyl levulinate 42 have been reported to be of good dissolving capacity with UPPs, many of them bring satisfying thermomechanical properties for the thermosets due to the lack of rigid structure.…”

Section: Introductionmentioning

confidence: 99%

Enhanced performance of a bio‐based diluent with both vinyl and epoxide groups for unsaturated polyester resin applications

ShangGuan

Zheng

Jiang

et al. 2022

Journal of Polymer Science

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Styrene has been widely used as a reactive diluent for a variety of commercial unsaturated polyester resins (UPRs), but suffered from high volatility. In this work, we developed a bio-based reactive diluent, 4-vinylguaiacol glycidyl ether (DE4VG), via an epoxidation of 4-vinylguaiacol (4VG). Excellent miscibility and high reactivity of DE4VG were demonstrated by a series of copolymerization tests with an unsaturated polyester prepolymer (named PMSD) synthesized from maleic anhydride, 1,3-dihydroxypropane and succinic acid. While, significant advantages in terms of viscosity and volatility were confirmed. Additionally, DE4VG provides both vinyl and epoxide groups and the epoxide groups were cured using 4,4-diamino diphenylmethane (DDM) to participate the network formation of the cured PMSD/DE4VG/TBPB/DDM resin, result-

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“…The thermochromic coating can not only be used for surface temperature measurement [5], 3D printing [6], overtemperature warning [7], and anti-counterfeiting identification [8], but also for decoration [9]. At present, most of the thermochromic coatings are prepared by adding thermochromic materials into the coatings [10]. In addition, thermochromic materials can be generally divided into three categories: organic, inorganic, and liquid crystal thermochromic materials [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Coating Process on Performance of Reversible Thermochromic Waterborne Coatings for Chinese Fir

2020

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The effect of the coating process on the properties of reversible thermochromic waterborne coating on the surface of Chinese fir was examined. The results demonstrated that the most critical process parameter affecting the color difference and gloss of the coating was the way of adding thermochromic ink. The coating process had little influence on the adhesion, impact resistance adding, liquid resistance, and original properties of the coating. There was no obvious gloss variation in the coating under different coating processes. For the (3+3) layered coatings, when the thermochromic ink was added to the topcoats, the discoloration performance was the most obvious and the comprehensive performance of coating was better. Meanwhile, the gloss was 55.6%, the adhesion grade was grade 0, the impact resistance was 5.0 kg·cm, the liquid resistance grade of the coating to sodium chloride, ethanol and detergent was grade 1, and the liquid resistance grade to red ink was grade 3. The discoloration performance of the coating was stable under the conditions of aging and time change. This study provides new insight into preparing thermochromic intelligent waterborne wood coatings with potential practical applications on Chinese fir wood surfaces, and also lays a foundation for its application in furniture engineering.Coatings 2020, 10, 223 2 of 15 consumption. Wang et al. [14] prepared a poly-3,4-ethylene dioxythiophene coating, which provided a new idea for the preparation of a highly conductive coating with an obvious thermochromic effect on the textile pattern. Pan et al. [15] prepared the thermochromic vanadium dioxide films co-sputtered by vanadium and stainless-steel. It has good durability in high-temperature environments, whether humid or dry. The thermochromic coatings in these studies are chiefly used in the fields of windows, buildings, fabrics, infrared sensors, etc., while research on the thermochromic waterborne coatings applied to the surface of furniture and wood is relatively rare.Organic reversible thermochromic materials are mainly composed of chromogenic agents and solvent, which have significant characteristics in the temperature of color change, color combination, and color contrast before and after color change [16]. Therefore, compared with inorganic and liquid crystal thermochromic materials, organic thermochromic materials are more popular because of their sensitive color change, rich color, good durability, long shelf life, and low cost. Organic reversible thermochromic ink has the advantages of convenient detection. They are fast, accurate, have no need for additional auxiliary equipment, and have a broad application prospect in thermochromic coatings [17]. Chinese fir is highly applied to construction, in bridges, house furnishings, woodwork, and other domains [18], on account of its light weight, good machinability, resistance to deforming, insect-resistance, anti-corrosion, and other excellent properties [19]. Waterborne wood coatings are free of volatile organic compounds (VOCs) [20] and air co...

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Solvent-free microwave-assisted synthesis and characterization of polybenzoxazine as a thermochromic material for smart coatings

Cited by 8 publications

References 13 publications

Reversible Thermochromic Ink based on Crystal Violet Lactone/Boric Acid/Hexadecyl Alcohol for Anti-Counterfeiting Printing

Reversible Thermochromic Ink based on Crystal Violet Lactone/Boric Acid/Hexadecyl Alcohol for Anti-Counterfeiting Printing

Enhanced performance of a bio‐based diluent with both vinyl and epoxide groups for unsaturated polyester resin applications

Effect of Coating Process on Performance of Reversible Thermochromic Waterborne Coatings for Chinese Fir

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