27205-03-4Relevant articles and documents
Modulation of Thermally Activated Delayed Fluorescence in Waterborne Polyurethanes via Charge-Transfer Effect
Li, Zongren,Wang, Tao,Xu, Dong,Zuo, Jie,Li, Xinyu,Li, Zhiwei,Xu, Fei,Zhang, Xingyuan
, p. 2302 - 2308 (2019)
Here, we designed several waterborne polyurethanes (WPUs) with efficient thermally activated delayed fluorescence (TADF) via serving charge-transfer (CT) states as a mediate bridge between singlet and triplet states to boost reverse intersystem crossing (RISC). By tuning substituents of diphenyl sulfone (DS), we found that O,O′- and S,S′-substituted DS covalently incorporated in WPUs solely show typical fluorescence emission with lifetimes in the nanosecond range. Interestingly, TADF appears by replacing the substituent with the nitrogen atom, of which lifetimes are up to ≈10 microseconds and ≈1 millisecond in air and vacuum, respectively, even though the energy gap between singlet and triplet states (ΔEST) is still large for generating TADF. To explain this phenomenon, an energy level mode based on CT states and an 3(n-π*) receiver state was proposed. By the rational modulation of CT states, it is possible to tune the ΔEST to render TADF-based materials suitable for versatile applications.
Ethoxylated (2) bisphenol S diacrylate and its preparation method
-
Paragraph 0037; 0038; 0039, (2017/07/14)
The invention provides an ethoxy (2) bisphenol S diacrylate and a preparation method thereof. The method comprises the following steps: carrying out esterification reaction on dihydroxyethyl bisphenol S and acrylic acid in a nitrogen protective atmosphere by using toluene as a solvent, organic acid as a catalyst and p-hydroxyanisole as a polymerization inhibitor; and after the esterification reaction finishes, removing the toluene by alkali washing, water washing, drying and depressurizing, recrystallizing the product with ethanol to obtain the ethoxy (2) bisphenol S diacrylate. The method is simple in technique, and can be used for preparing the bifunctional high-refractivity monomer ethoxy (2) bisphenol S diacrylate which simultaneously contains sulfur and benzene ring.
Aromatic ethers and process for producing aromatic ethers
-
Page 13, (2010/02/08)
According to a production process, aromatic ethers are producible by reacting phenols with an oxirane compound with use of an anion exchange resin as a catalyst. According to another production process, aromatic ethers having an alcoholic hydroxyl group are producible by a crystallization-purification step of using a solvent having a solubility parameter ranging from 7.5 to 12.5 for purification by crystallization. Further, according to still another production process, producible are aromatic ethers having an alcoholic hydroxyl group, wherein the content of a metal in the aromatic ethers is less than 100 ppm by mass, and the content of a halogen element in the aromatic ethers is less than 100 ppm by mass.