Superomniphobic SiO2@poly(1H,1H,2H,2H-heptadecafluorodecyl methacrylate-co-methyl methacrylate) (SiO2@poly(FMA-co-MMA)) core-shell spheres were synthesized via a thiol lactam initiated radical polymerization (TLIRP). SiO2 and poly(FMA-co-MMA)s were used as they imparted both surface roughness and low surface energy for superhydrophobic surfaces. SiO2 particles were synthesized using the Stöber method, and their surface was subsequently modified with (3-mercaptopropyl) trimethoxysilane and used as seeds for polymerization in the presence of γ-butyrolactam. The CH2 peaks (4.26 and 2.56 ppm) from poly(FMA) and the CH3 peak (3.53 ppm) from poly(MMA) were observed in the 1H-NMR spectra, indicating successful preparation of SiO2@poly(FMA-co-MMA) by TLIRP. The maximum water and hexadecane contact angles of an aluminum plate coated with particles were 164.0° and 130.1°, respectively. The cross-cut tape test of the coated aluminum plate showed that adhesion between the coating material and the substrate was classified as 5B, without damage. Furthermore, the substrate maintained superhydrophobicity after 40 cycles of tape peeling, although the water contact angle slightly decreased (163.1°) and the sliding angle slightly increased (2° to 3°). The mechanical strength of the coated aluminum plate was enhanced by heat treatment above the Tg of SiO2@poly(FMA-co-MMA)s. The SiO2 content of SiO2@poly(FMA-co-MMA)s affected the wettability of the coating surface due to roughness generated by the core SiO2 particles.
Bibliographical noteFunding Information:
This research is supported by Energy Research and Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20172010105890 ).
© 2020 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Surfaces, Coatings and Films
- Organic Chemistry
- Materials Chemistry