Fabrication and characterization of graphene oxide modified polycarboxylic by in situ polymerization

Abstract

Graphene oxide (GO) was modified by in situ esterification reaction with isopentenol polyoxyethylene ether (IPEG) to obtain GO precursor (GO‐IPEG) with some polymerization activity. GO‐modified polycarboxylic (GO‐PCE) was prepared by GO‐IPEG and acrylic acid (AA) using the method of in situ polymerization. The molecular structure of GO‐IPEG and GO‐PCE was characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectra, and nuclear magnetic resonance (NMR). The dispersion properties and dispersion stability of GO‐IPEG and GO‐PCE in water solution were studied by ultraviolet–visible (UV–vis) absorption spectra, zeta potential, and atomic force microscope. The results of FTIR, Raman, 1H‐NMR, and 13C‐NMR indicate that IPEG was successfully grafted onto the surface of GO and then fabricated with AA by in situ free‐radical polymerization. The results of UV–vis and zeta potential show that GO nanosheets have a better dispersion in GO‐IPEG or GO‐PCE system when the reaction time of GO and IPEG is 1 h, and the dispersion stability can reach up to 1 month. The better dispersion and application property are confirmed by atomic force microscopy image and cement fluidity, water reducing rate, and compression strength. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48316.

Study on the activity difference of macromonomers for preparing polycarboxylic superplasticizers

“…The polyether macromonomers used in the production of PCE mainly include methoxy‐PEG, allyl‐PEG, methallyl‐PEG (HPEG), and isoprenol‐PEG (IPEG) macromonomers. According to the usage statistics, HPEG and IPEG are still the most commonly used macromonomers, when such two macromonomers be used to synthesize PCE, a heating reaction process is usually employed (the reaction temperature is 30–60 °C, even 80 °C sometimes), and the production cycle is about 4–5 h . By analyzing the structure of these two commonly used macromonomers, it can be found that they are all the same type of vinyl alcohol‐based macromonomers because their starting agents are both vinyl alcohol.…”