Brush-like poly(ethylene glycol) grafting on SiO₂nanoparticles within-situpolymerization

Abstract

This work presents the grafting of poly(ethylene glycol) (PEG) on the SiO2 nanoparticles by the use of the azo‐groups bonded SiO2 as a radical initiator and poly(ethylene glycol) methyl ether methacrylate (PEGMA) as a macromonomer, respectively. Then a kind of organic–inorganic composite particles with brush‐like PEG fixed covalently on the SiO2 nanoparticles, SiO2–PEG, is synthesized. The successful synthesis of SiO2–PEG is confirmed by FT‐IR, XPS, and TEM techniques. Results show that the conversion degree of PEGMA can reach nearly 30% while the PEG graft amount accounts for ca. 43% of the total weight of the composite particles. After the PEG is grafted on the SiO2 nanoparticles, the mobility of PEG chains is hindered by the proximity of oxide phase of SiO2. As a result, PEG phase is strongly disturbed. Consequently, the grafted PEG melts at a low temperature with small quantity of heat enthalpy. Copyright © 2014 John Wiley & Sons, Ltd.

Synergistic effects of silica nanoparticles and reactive compatibilizer on the compatibilization of polystyrene/polyamide 6 blends

“…For the TG traces of SiO 2 , the weight loss before heating at 200°C was achieved because of the loss of absorbed water molecules and the release of structural water. By contrast, the weight loss at 200–900°C was attributed to the rupture of SiOH . Compared with pristine SiO 2 , all the other composites were found to exhibit considerable weight loss between the temperatures of 300 and 500°C, owing to the thermal degradation of the grafted polymer chains.…”

Preparation of poly(ethylene oxide) brush‐grafted multiwall carbon nanotubes and their effect on morphology and mechanical properties of rigid polyurethane foam

“…(b)), the adsorption peaks at 2924 and 2856 cm −1 are attributed to the CH 2  symmetric and asymmetric stretching vibrations, respectively. The methylene characteristic peak shifts to 2869 cm −1 in the spectrum of PEO‐ graft ‐MWCNT and the peak intensity increases markedly . The sharp peak at 1106 cm −1 is assigned to the CO stretching vibration of the PEO .…”

“…(c)), the C 1s signal can be fitted with four different Gaussian peaks corresponding to four different types of carbon atoms: CO, CC, CC and CO at 286.5, 285.2, 284.4 and 288.9 eV, respectively . The peak at 286.5 eV is assigned to CO bond resulting from the grafted PEO polymer . The high‐resolution oxygen elemental scans of MWCNTs and PEO‐ graft ‐MWCNT are shown in Fig.…”

“…The methylene characteristic peak shifts to 2869 cm −1 in the spectrum of PEO-graft-MWCNT and the peak intensity increases markedly. 29,30 The sharp peak at 1106 cm −1 is assigned to the C-O stretching vibration of the PEO. 31 The results indicate that PEO polymer brushes have been covalently grafted on the surface of MWCNTs.…”

“…32 The peak at 286.5 eV is assigned to C-O bond resulting from the grafted PEO polymer. 30 The high-resolution oxygen elemental scans of MWC-NTs and PEO-graft-MWCNT are shown in Fig. 4(d).…”