Effect of SiO2@PEGMA Composites on Mechanical Properties of Oil Well Cement

Gang Wang; Hua Tan; Chunjing Lu; Ao Sun

doi:10.1021/acsomega.2c03202

Effect of SiO₂@PEGMA Composites on Mechanical Properties of Oil Well Cement

ACS Omega. 2022 Jun 30;7(27):24012-24019. doi: 10.1021/acsomega.2c03202. eCollection 2022 Jul 12.

Authors

Gang Wang^{1

2}, Hua Tan¹, Chunjing Lu³, Ao Sun⁴

Affiliations

¹ School of Chemistry, Guangdong University of Petrochemical Technology, Maoming 525000, China.
² Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, Guangdong University of Petrochemical Technology, Maoming 525000, China.
³ School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China.
⁴ Center of Chemistry for Frontier Technologies, Zhejiang University, Hangzhou 310058, China.

Abstract

SiO₂@PEGMA composites were synthesized by grafting poly(ethylene glycol) methacrylate (PEGMA) on SiO₂ nanoparticles via radical polymerization. The chemical structures of the SiO₂@PEGMA composites were analyzed by Fourier transform infrared, ¹H NMR, and transmission electron microscopy methods. The mechanical and fresh properties, hydration products, heat of hydration, microtopography, and pore structures were studied. The shell formed by the grafted PEGMA gave the SiO₂@PEGMA composite a steric hindrance effect, which enabled it to have excellent dispersion stability even in the cement pore solution. The SiO₂@PEGMA composites could not only effectively facilitate hydration reaction and generate calcium silicate hydrate (C-S-H) through the seeding effect but also make the pore structure more compact by the filling effect. Compared with other control groups, SiO₂@PEGMA composites could obviously enhance the compressive strength of cement samples, which was increased by 36.7% after curing for 28 days.