Surface modification of polytetrafluoroethylene filmsvia graft copolymerization for auto-adhesion

Abstract

The surfaces of Ar plasma‐pretreated polytetrafluoroethylene (PTFE) films are further functionalized via UV‐induced graft copolymerization with amphoteric N,N′‐dimethyl(methacryloylethyl)ammonium propansulfonate (DMAPS) either in Ar atmosphere, or under atmospheric conditions and in the absence of a polymerization initiator. The so‐modified PTFE films from either process are capable of exhibiting adhesive‐free adhesion or auto‐adhesion with one another when brought into intimate contact in the presence of a small quantity of water. The lap shear adhesion strength increases with increasing graft concentration and can readily exceed the yield strength of the PTFE substrate. Two plasma‐pretreated PTFE films also readily undergo thermal graft copolymerization with concurrent lamination when lapped together in the presence of a small quantity of the DMAPS monomer solution at elevated temperature in the atmosphere. The surface compositions of the graft‐copolymerized PTFE films and the delaminated surfaces were characterized by X‐ray photoelectron spectroscopy (XPS). In most cases, adhesional failure occurred near the graft‐substrate interphase. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 3107–3114, 1998

Preparation, characterization and enhanced visible light photocatalytic activities of polyaniline/Bi3NbO7 nanocomposites

“…However, the performances of Bi 3 NbO 7 in the photocatalytic reactions are still unsatisfactory. Polyaniline (PANI) is known as a good conductive polymer [20]. Furthermore, it is also regarded as an efficient photogenerated holes-transporting material, which can facilitate the separation of photo-generated electron-hole pairs and can promote interfacial electron transfer process [21].…”

p-benzoquinone diimines and thiophene based alternating copolymers: organometallic catalyzed syntheses and elementary characterization

“…The better solubility of these copolymers in CF 3 COOH is the possible reason for such bathochromic shift, which allows the detection of absorption signals of copolymers with bigger molecular weight. On the other hand, the polaron / bipolaron effect might be formed in CF 3 COOH doped copolymers, as was reported previously for the pernigraniline-type oligomers [27].…”

SDBS-assisted preparation of novel polyaniline planar-structure: Morphology, mechanism and hydrophobicity

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