Tian, Yanxin; He, Yulin; Liu, Pan; Zhang, Hui; Zheng, Qiuying; Liu, Jialiang; Xiao, Linghan; Wang, Xibin; Ao, Yuhui; Li, Ming published their research in Journal of Materials Science in 2021. The article was titled 《Mild and in situ photo-crosslinking of anthracene-functionalized poly(aryl ether ketone) for enhancing temporal stability of organic NLO materials》.Quality Control of 4-Bromobutanoic acid The article contains the following contents:
Developing a mild and efficient method to simultaneously enhance poling efficiency and temporal stability is meaningful and challenging for organic second-order nonlinear optical materials. In this paper, a new poly(aryl ether ketone) and chromophores functionalized with anthracene groups have been designed and prepared Poling and crosslinking process could be separated by the mild and photo-initiated cycloaddition of anthracene group. As the UV-Vis spectrum, DSC and TGA curves, the networks had formed by 30-min irradiation of the lower-power UV light which led little decomposition of dipolar chromophores. The maximum electro-optic coefficient (r33) of these polymers is 28.5 pm V-1 (at 1.3μm), and the order parameter reaches 0.22. Moreover, the depolarization temperature of α peak, related to the dipole relaxation, has been increased to 129°C after crosslinking, which is 17°C higher than uncrosslinked ones. All these results indicated that the photo-crosslinking of anthracene exhibited promising potential for improving alignment stability and NLO activity at the same time. After reading the article, we found that the author used 4-Bromobutanoic acid(cas: 2623-87-2Quality Control of 4-Bromobutanoic acid)
4-Bromobutanoic acid(cas: 2623-87-2) belongs to carboxylic acids. The chief chemical characteristic of the carboxylic acids is their acidity. They are generally more acidic than other organic compounds containing hydroxyl groups but are generally weaker than the familiar mineral acids (e.g., hydrochloric acid, HCl, sulfuric acid, H2SO4, etc.).Quality Control of 4-Bromobutanoic acid
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary