Synthesis and Catalytic Application of Poly(2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid‐co‐acrylamide) Grafted on Graphene Oxide

Abstract

Graphene oxide was grafted with poly(2-acrylamido-2-methyl-1-propanesulfonic acid-co-acrylamide) (GO-poly(AMPS-co-AM)) by free radical copolymerization of the corresponding monomers namely acrylamide (AM) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). The benzoyl peroxide (BPO) was used as initiator. The GO-poly(AMPS-co-AM) was characterized by Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray diffraction (XRD), thermal gravimetric analysis (TGA), differential thermal analysis (DTA), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), UV-Vis and fluorescence spectroscopy, and elemental analysis. The GO-poly(AMPS-co-AM) exhibited the acidic site loading of 0.85 mmol g À 1 , the maximum degradation temperatures (T max ) of 212, 292, and 406°C, the char yield of 30% at 800°C, the limiting oxygen index (LOI) of 29.5, an estimated band gap of 4.7 eV, and the fluorescence emission bands of 722, 800, and 880 nm at the excitation wavelengths (λ max ) of 360, 400, and 440 nm, respectively. The GO-poly (AMPS-co-AM) was used as a reusable catalyst for the preparation of 1,8-dioxo-octahydroxanthenes through the condensation of an aldehyde with 5,5-dimethyl-1,3-cyclohexanedione (dimedone) in H 2 O/EtOH (1:1) as green solvents at room temperature.[a] Prof.

Porous Organic Polymer with Free Carboxylic Acids (Carboxy‐POP) for Heterogeneous Catalytic One‐Pot Synthesis of Xanthenes and Acridines

“…The mechanism of the acid‐catalyzed synthesis of xanthenes is known [71,72] . Along the same lines, the mechanism for Carboxy‐POP −mediated synthesis is shown in Scheme S3.…”

“…The mechanism of the acid-catalyzed synthesis of xanthenes is known. [71,72] Along the same lines, the mechanism for Carboxy-POPÀ mediated synthesis is shown in Scheme S3. Accordingly, carboxylic acid functionalities of the polymeric skeleton are surmised to activate the carbonyl group of the aldehyde by H-bonding, cf.…”

Sulfonic Group Modified Binder Endows Rapid Lithium‐Ion Diffusion for SiOx Microparticle Anode

“…As shown in Figure a, the strong absorption peak at 3400 cm −1 in the spectrum of AMPS is associated with the bending vibration of imino group (‐NH‐). [ 16 ] There are several small peaks at about 2900 cm −1 ascribed to the stretching vibration of methyl and methylene groups (‐CH 3 and ‐CH 2 ‐) [16b,17] . Besides, two sharp peaks can be observed at 1662 and 1550 cm −1 due to the stretching vibration of amide I band (C = O) and amide II band (N‐H), respectively.…”

“…[ 18 ] Two characteristic peaks of AMPS appear at around 1240 and 1080 cm −1 , which correspond to the symmetric and asymmetric stretching vibration of S = O in sulfonic acid group, respectively. [ 16a,17 - 19 ] Another characteristic peak located at 500 cm −1 represents the existence of CS bond [16b,19] . In the spectrum of AA, the broad peak between 2750–3330 cm −1 corresponds to the stretching vibration of hydroxyl group in carboxyl group (‐OH in ‐COOH).…”

Thermal Decomposition Behavior and Thermal Hazard of Benzoyl Peroxide under Different Environmental Conditions

“…The flammability and reactivity of BPO evaluated by the American Fire Protection Association (NFPA) are the highest level 4 (severe). BPO is relatively stable at room temperature, but it is prone to combustion and explosion under the influences of impact and friction . For example, in Japan, an explosion occurred during the production of benzoyl peroxide to cause many casualties.…”