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

Synthesis of hollow poly(aniline-co-pyrrole)–Fe3O4 composite nanospheres and their microwave absorption behavior

“…Figure 4 However, the binding energies were shifted to lower energy and were slightly different from those reported previously [17,25]. The energy level shifts can be accounted for by the dehydrogenation of pyrrolylium nitrogen and rearrangement of the pyrrole bonds to satisfy the nitrogen valences, and interaction between N and Fe atoms to form a coordinate bond, which could reduce the energy level of the composite nanospheres [19,26]. The C 1s spectrum of HPAP-Fe 04 nanospheres displays a large peak centered at about 285 eV, as shown in Fig.…”

Gold in polyaniline: Recent trends

“…polymer has been termed emeraldine (y = 0.5), and the 75% intrinsically oxidized polymer, is termed nigraniline (y = 0.75) (9). Figure 2 shows the mechanism involved in the polymerization of aniline.…”

Overview of emerging memristor families from resistive memristor to spintronic memristor

“…Therefore, by means of the adjustment of the actual potential of the active zone with respect to the reference potential, Li ? ions can be either injected to or removed from the PANI layer, thus providing the polymeric device with a memristive function [12,[44][45][46].…”