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    Fluoroalkyl polyhedral oligomeric silsesquioxane initiated methylmethacrylate polymer to produce hydrophobic coatings by low fluorine content

    Year: 2021

    Journal: Soft Mater., Volume 19, APR 3, page 231–242

    Authors: Li, Yanan; Pan, Aizhao; He, Ling; Jia, Mengjun

    Organizations: National Nature Science Foundation of China(NSFC) [51873173, 51573145]; National Key Research and Development Project [2019YFC1520504]

    Keywords: Fluorinated polyhedral oligomeric silsesquioxanes; core-shell micelles; hydrophobic Surface; self-assembled films; thermostability

    In order to improve hydrophobic surfaces with low fluorine content, an incomplete fluoroalkyl-capped polyhedral oligomeric silsesquioxane (ap-FPOSS) was synthesized as an initiator and used to initiate methylmethacrylate (MMA) to produce polymer ap-FPOSS-PMMA(100,150,200)by atom transfer radical polymerization (ATRP). Compared with fluorine-free ap-POSS-PMMA and PMMA polymers, the films cast from 200 to 470 nm core-shell micelles self-assembled by the obtained ap-FPOSS-PMMA presented higher water contact angles (114 degrees-124 degrees), lower surface energy (9.6-14.9 mN center dot m(-1)), lower water absorption (Delta f = 270 Hz), and lower viscoelasticity (Delta f/Delta D = -1.7 HZx10(6)), which were attributed to their increased surface roughness and fluorine content. Additionally, ap-FPOSS-PMMA exhibited a much higher thermostability (T-g>120 degrees C, T-d>380 degrees C) and light transmission (>97%) than fluorine-free polymer of ap-POSS-PMMA. The application of ap-FPOSS-PMMA proved that the low fluorine component in ap-FPOSS was able to produce a highly hydrophobic coating on a cotton surface (122 degrees-124 degrees).
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