As a new information storage material, photochromic compounds have the characteristics of high resolution and large storage capacity, which can be widely used in frontier fields such as optical information storage, optical conversion devices and optical switches, and have aroused widespread interest. The countries that study photochromic materials… Read More »Application of photochromic polymers

Many studies have proved that the photochromic mechanism of Schiff base proposed by Cohen, namely the excited state proton transfer reaction mechanism, is reasonable. However, the structure of photochromic and thermochromic products has been a topic of debate. Cohen et al. believed that thermochromic products have a (cis-Keto)… Read More »Structure of photochromic and thermochromic products

Under the action of light, polymers that can reversibly change color are called photochromic polymers, which belong to polymer materials. According to Krongauz’s definition of a photochromic polymer, a photochromic polymer means that the photochromic pigment molecules are chemically bonded to large molecules. In the strict sense, photochromic… Read More »Definition of photochromic polymers

Preparation method(1) Preparation of acrylic prepolymer. Benzoyl peroxide was evenly mixed with styrene, methacrylic acid and methyl acrylate in proportion, and 20% of the mixture was added to the four-mouth flask with butanol, evacuated and filled with N, and the temperature was raised to 93℃. The remaining 80%… Read More »Preparation method of acrylic thermochromic paint

I. Use of pigment:Our products can be directly used to prepare printing inks (screen printing, offset printing, gravure printing and flexography), coatings and for injection/extrusion. Second, the choice of solvent:Temperature-sensitive color-changing powder has good tolerance to gasoline, kerosene, mineral oil, benzene, toluene, xylene, cyclohexanone, benzyl alcohol, turpentine, DBP/DOP… Read More »Method of Mix ink using thermo-sensitive powder

Preparation method:(1) Preparation of acrylic prepolymer. Add part of the diluent into the flask, pass N, heat up to the reflux state, add monomer and part of diisopropylbenzene peroxide, drop for 3h, and keep warm for 1h; Then add the remaining diisopropylbenzene peroxide and diluent, drop for 15min,… Read More »Preparation of polyester acrylic thermochromic paint

Color is a substance that has a certain color in itself and can color other objects. According to the solubility in the solvent, the color can be divided into two categories of dyes and pigments, in the relevant literature, the two are often mixed as – talk. Both… Read More »Classification of fluorescent environmental Friendly colors

Photochromism refers to the phenomenon that when A compound (A) is irradiated by a certain wavelength of light, it can undergo a specific chemical reaction to obtain a product (B), which results in a significant change in its absorption harmonic due to a change in structure. Under the… Read More »Definition and System of Photochromism

Cohen et al. systematically studied the absorption spectra of salicylaldehyde aniline compounds, and found that some crystals of these compounds were photochromic and some were thermochromic. According to the spectral properties and crystal structure, they divided the crystals of these compounds into two categories.There are many differences between… Read More »relationship between crystal structure and photochromism and thermochromism