Modification of isotactic polypropylene by a cold plasma or an electron beam and grafting of the acrylic acid onto these activated polymers

Abstract

SYNOPSISSurface grafting of polymeric materials, such as films and fibers, may improve their reactive surface properties. Polypropylene active sites that should initiate a surface postgrafting can be formed by either nitrogen cold plasma or an electron-beam irradiation. The plasmamodified polymer surface is cross-linked and functionalized with primary amino groups and with oxidized groups, and it is almost not degraded. Electron-beam-modified polypropylene is also functionalized through an aging reaction, emphasized by a high radical concentration. In both cases, active surface films are susceptible to react with monomers in a postgrafting reaction. The grafting yield and rate of acrylic acid were shown to be dependent on the formed amino group concentration: The hydrophilic character of the modified polypropylene surface enhances the acrylic acid approach. The electron-beam treatment leads also to a reactive surface that can initiate a grafting reaction. But its yield and rate are dependent on the radical concentration: radicals formed during the irradiation. 0 1994 John Wiley & Sons, Inc.

Model compounds and13C NMR increments for the characterization of maleic anhydride-grafted polyolefins

“…The chemical shifts of the other protons subsequently were determined easily by homonuclear correlation spectroscopy. Analogously, in the 1 H NMR spectra of the other compounds (2)(3)(4)(5)(6)(7)(8), the ring protons gave rise to characteristic, easily recognizable signal patterns, which allowed the full interpretation of the 1 H NMR and 13 C NMR spectra aided by correlation spectroscopy. In the 100-MHz noise decoupled 13 C NMR spectrum of hept-4Ј-yl succinic anhydride (1) [Fig.…”

Surface wetting processing on BNNT films by selective plasma modes

“…On the other hand, the 5CW+10P plasma also creates BN x O y species, with O/B ratio increased to 0.24 by N 2 /H 2 plasma treatment. The C 1s spectra of the films treated with both plasma modes show peaks consistent with amide (288.1 eV) and amine (285.8 eV), but also indicate the presence of imine (nitrile) (286.7 eV) [44,45]. While the N 2 alone plasma treated films in figure 6(f) presented more imine grafted.…”

Effect of Plasma on Dyeability of Fabrics

“…EB modified PP was also functionalized through an aging reaction, emphasized by a high radical concentration. Active surface films are susceptible to react with monomers in a postgrafting reaction (Poncin-Epaillard, Chevet, & Brosse, 1994). In this work, the PP fabric is irradiated with electrons to form oxygen containing groups on its surface.…”