An UV‐curable epoxy acrylate oligomer with high refractive index containing fluorene: Preparation, characterization, and application

Abstract

In this article, a novel UV-curable epoxy acrylate oligomer (BPEFPGMA) with high refractive index is successfully prepared through semi-esterification reaction of 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene and phthalic anhydride, followed by endcaping of glycidyl methacrylate. After 15 times' repetitions, the process and properties of this oligomer are stable and reliable. The resulting BPEFPGMA exhibited low solvent content (1600 ppm), low viscosity (1900-2500 mPa s at 608C), high refractive index (1.587 6 0.003 at 208C), and normal M w (2550-3536 g/mol). The coating formulations of 1.57 UV-curable glue are mixed with BPEFPGMA as reactive oligomer. Through the technology of UV-curing forming, the corresponding brightness enhancement films are obtained. The resulting films exhibit normal structure, excellent adhesion (5B), good scratch resistance (50 g), and good abrasion resistance (50 g). They show excellent performance, and have reached the quality standard for use in liquid crystal display industry.

Synthesis and evaluation of novel aromatic acrylic monomers for optically clear adhesive with high refractive index

“…The consumption of oxiran groups resulted in higher EEW values so that the EEW number over 2400 g eq À1 may be considered as a good indication of the reaction completion. 11,30 The simultaneous lowering of acid number is in agreement with the increase in EEW values, whereas the acid number lower than 100 mg KOH g À1 may be considered a good measure of the reaction progress. Note that the acid numbers much lower than 100 mg KOH g À1 resulted in gelation of the composition.…”

“…The high EEW value give a good indication of the progress in esterification reaction of epoxy. 11 Further investigations on chemical structure of the synthesized monomer (PA.BA.GMA) were continued using FTIR spectroscopy. Figure 7 shows the infrared spectra of the monomer (PA.BA.GMA), BA and PA.…”

“…10 The aromatic ring of bisphenoxy ethanol fluorine (BPEF), phthalic anhydride, and glycidyl methacrylate (GMA) were found to improve the RI of up to 1.58. 11 Some reports clearly indicate the positive effect of the aromatic polyphosphonate, 12 sulfurcontaining aliphatic and alicyclic methacrylates or even bisphenol-S [13][14][15] on RI values.…”

Photosensitive Composite Inks for Digital Light Processing Four-Dimensional Printing of Shape Memory Capture Devices

“…The reaction for synthesizing the photosensitive epoxy ink takes place in the resin synthesizer at a constant temperature as shown in Figure a. Figure S1 exhibits the reaction equation between EP and AA in the presence of a catalyst, which is essentially an addition esterification reaction between the epoxy and carboxyl groups. − Compared with the conventional esterification, no water is produced . The ingredient EP is a colorless and transparent liquid and the reaction product EPAc is a yellow transparent liquid.…”

“…38−40 Compared with the conventional esterification, no water is produced. 41 The ingredient EP is a colorless and transparent liquid and the reaction product EPAc is a yellow transparent liquid. The viscosity versus shear rate curves in Figure 1b show that the initial viscosity of EP and EPAc is 10.8 and 12.0 Pa•s, respectively.…”