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    Preparation and characterization of polyacrylate emulsion pressure-sensitive adhesives with various lengths of fluorinated side chains

    Year: 2022

    Journal: J. Adhes. Sci. Technol., Volume 36, MAY 19, page 1041–1059

    Authors: Fang, Cheng; Xue, Junjie

    Organizations: Jiangsu Province Higher Education College Students Innovation and Entrepreneurship Training Program [201910298012Y]; Scientific Research of High-level (Highly educated) Talents of Nanjing Forestry University [GXL2018038]; Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

    Keywords: Fluorine monomers; polyacrylate emulsion; pressure-sensitive adhesive; surface morphology; adhesive property

    A series of fluorinated polyacrylate emulsion pressure-sensitive adhesives (PSA) with various lengths fluorinated side chains were synthesized by using n-butyl acrylate (nBA), acrylic acid (AA), 2-hydroxyethyl acrylate (HEA) together with three kinds of fluorine monomers trifluoroethyl methacrylate (TFEMA), hexafluorobutyl methacrylate (HFBMA) and dodecafluoroheptyl methacrylate (DFHMA). The influences of fluorocarbon chains' length on the particle size of the latex, as well as on thermostability (DSC, TG) and surface properties (XPS, CA, AFM) of the PSA films were investigated. The results showed that T-g and thermal stability of the PSA were both increased with the introduction of F-monomers with various lengths of fluorinated side chains, and the shorter the side chain, the more the T-g and thermal stability increased. The XPS results indicated that the surface atom percentage of F element of film increased with the escalation of the length of fluorocarbon lateral chain, which results in the water contact angle and surface roughness increment of the PSA films. Finally, effects of fluorocarbon chains' length on the adhesive properties (i.e. loop tack, peel strength and shear strength) of the fluorinated latex PSA were also evaluated.
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