Photochromic azo polysemicarbazides with biocompatibility behavior

Abstract

Two kinds of azo polysemicarbazides were prepared based on 3, 3'-azobis (benzoylhydrazide) (ABH) and two kinds of diisocyanates via solution polymerization. The structures were characterized by Fourier-transform infrared (FT-IR) technique and elemental analysis. Inherent viscosities of the polymers were 0.32 and 0.29 dL/g and both could be dissolved in H 2 SO 4 and polar organic solvents. Thermal gravimetric analysis (TGA) presented a multi-step degradation and a decomposition temperature range of 230-280 ℃. And photoisomerization of the azo polymers in solvent of N, N-dimethyl acetamide (DMAc) was confirmed by Ultraviolet-visible spectroscopy (UV-Vis), suggested the isomerization appearing under the ultraviolet irradiation at 365 nm and recovering completely by visible light irradiation or kept in the dark. Transmission electron microscopy (TEM) of polysemicarbazides before and after soaking in bovine serum albumin (BSA) solution confirmed the biocompatibility of azo polymers.

A Color Management Model for Color Sensors of Liquid Crystal Display

“…Tab. 1 provides a transformation accuracy statistics for all the 288 color blocks through the algorithm of the paper, the polynomial fitting algorithm which is widely used for its relatively high transformation accuracy and the BPNN algorithm in this experiment [3,5]. BS aberration unit is the one adopted by American National Standards Institute.…”

“…Lately, a new transformation method based on BPNN and machine learning emerges, which is fairly good in accuracy but leaves behind the question of slow convergence speed of its algorithm. Therefore, it is hard to put into effect in color management of liquid crystal display [2,3].…”

Novel “Rigid to Flexible” Biobased Polyesters Fully Derived from 5-Hydroxymethylfurfural: Promising as Sustainable UV Shielding and Gas Barrier Materials

“…The maximum decomposition rate in the second stage at 200−300 °C was caused by the cracking of the main chain unit and the long-chain polymer into short-chain molecules, as well as the cleavage of methylene and other bonds. 37 In the third stage, the decomposition temperature was between 300 and 500 °C, and as the small chain segments continued to break into small molecules, the weight decreased slowly. When heated to 600 °C, all the polyesters decomposed under nitrogen conditions and left more than 20% residue.…”