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    Hydrophobic and Durable Adhesive Coatings Fabricated from Fluorinated Glycidyl Copolymers Grafted on SiO2 Nanoparticles

    Year: 2019

    Journal: ACS Appl. Nano Mater., Volume 2, JAN, page 617–626

    Authors: Wang, Jianli; He, Ling; Pan, Aizhao; Zhao, Yanrui

    Keywords: SiO2 particles; fluorinated glycidyl copolymer; hydrophobic surface; durability of adhesive strength; coatings

    To obtain durable adhesive, highly hydrophobic, and thermostable coatings, novel fluorinated glycidyl copolymers grafted on SiO2 nanoparticles were prepared by SiO2-Br initiating covalent adhesion of glycidyl methacrylate (GMA) and low surface free energy of dodecafluoroheptyl methacrylate (12FMA) via surface initiated atom transfer radical polymerization. In tetrahydrofuran solution, the obtained random-structured SiO2-g-(PGMA-co-P12FMA) behaves with 120 +/- 10 nm core-shell morphology as SiO2-core (110 +/- 10 nm) and (PGMA-co-P12FMA) shell (8 +/- 2 nm). The films cast by these core-shell particles reveal stronger hydrophobic surfaces (SAC = 114-119 degrees), higher resistance to water absorption (Delta m = 2478 ng.Hz(-1).cm(-2)), and harder viscoelasticity (Delta D/Delta f = -0.379) compared to the SiO2-g-PGMA film (SAC = 90 degrees, Delta m = 6153.7 ng.Hz(-l).cm(-2) , and Delta D/ Delta f = -0.271) due to the accumulated fluorine-rich surface and increased surface roughness. The introduction of antiaging P12FMA obviously improves the durability of adhesive strength of SiO2-g-(PGMA-co-P12FMA) (1.82 MPa) compared with that of SiO2-g-PGMA (decreased from 1.92 to 1.56 MPa) during the humidity thermal aging cycles. Meanwhile, SiO2-g-(PGMA-co-P12FMA) displays thermostability higher than that of both SiO2-PGMA and PGMA-co-P12FMA, attributed to the contribution of SiO2 and P12FMA. Therefore, it is believed that SiO2-g-(PGMA-co-P12FMA) could be an excellent potential candidate for highly hydrophobic and durable adhesive coatings.
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