Surlyn®/[silicon oxide] hybrid materials. 2. Physical properties characterization

Surlyn®/titanate hybrid materials via polymer in situ sol–gel chemistry

“…The band in the region of CH 2 rocking, which is expanded in Figure 8 for close inspection, consists of two closely spaced peaks that are similar to those seen in spectra for Surlyn/silicate nanocomposites. 10 This feature is also present for the composites in this work, although the absorption envelope for the titanate filler is progressively stretched toward higher wave numbers with increasing titanate content. The persistence of band-splitting with the incorporation of the inorganic component supports the idea of undisrupted crystallinity, which is in harmony with the DSC evidence for crystallinity as discussed subsequently.…”

“…After polymer resin in situ sol-gel reactions and drying, resultant Surlyn-H/silicate (4 wt %) flakes were processed through a single-screw extruder to assess the effect of silicate structure of flow to zones of increasingly higher temperature and complex shearing forces. 10 All silicate IR fingerprint bands for the processed hybrid persist, and the spectrum closely resembles that of a comparable nonextruded hybrid. The 29 Si solid-state NMR spectrum of this silicate phase is consistent with spectra of nonextruded hybrids in that Si atom coordination around SiO 4 units is predominantly Q 3 and Q 4 with a bias toward the Q 3 state.…”

“…Mauritz et al, 10 as well as others, 29,30 discuss the two endothermic transitions that appear on the first heating scans of unfilled Surlyn-H. These transitions are inherent to both the acid and counterion-exchanged forms.…”

“…Also, previous experiments demonstrated that novel, nanostructured poly[ethylene-co-methacrylic acid (and Zn ϩ2 ion forms)]/silicate hybrids are achievable via polymer in situ sol-gel reactions for tetraethoxysilane (TEOS). 10,11 The copolymer used as the sol-gel polymerization matrix was commercial Surlyn 12 in the form of melt-pressed films. Fourier transform infrared (FTIR) spectra provided evidence of bonded silicate structures that were incorporated in both the acid (H) and Zn ϩ2 ionomer forms.…”

“…The mechanical tensile modulus of these hybrids increases, whereas elongation-at-break decreases monotonically with increasing silicate uptake, which demonstrates that this inorganic modification process increases material stiffness, a desirable property within the realm of some packaging materials. 10 Helium gas-permeation studies suggest a dual-mode sorption in which some gas molecules are associated with silicate particles, perhaps by their entrapment in pores, and the remaining molecules are dissolved in the amorphous regions of the hydrocarbon phase. 10 There is a mild decrease in the swelling capacity of these hybrids in organic solvents as silicate loading increases, which was attributed, in part, to an increasingly greater number of unfavorable nonpolar solvent interactions with polar SiOH groups.…”