Summary: This contribution reports on a FT-IR study of the hydrogen bonding interactions within blends of different ratios of poly(styrene-co-methacrylic acid) containing 15 mol% of methacrylic acid PSMA-15 and poly(styrene-co-4-vinylpyridine) containing 15 mol% of 4-vinylpyridine PS4VP-15. Equilibrium constants describing both the self-association K 2 and inter-association K A in the (75:25) blend of poly-(styrene-co-methacrylic acid) containing 12 mol% of methacrylic acid PSMA-12 with poly(styrene-co-4-vinylpyridine) containing 22 mol% of 4-vinylpyridine PS4VP-22 were experimentally determined using a curve fitting analysis of the infra-red spectra. The FT-IR study at various temperatures confirms the miscibility of this blend up to 175 8C.
Poly(methyl methacrylate) (PMMA) and poly(methyl methacrylate)/clay nanocomposite (PMMA/ OBT) were successfully prepared in dioxan at room temperature via in situ radical polymerization initiated by a new Ni(II)a-Benzoinoxime complex as a single component in presence of 3% by weight of an organically modified bentonite (OBT) (originated from Maghnia, Algeria) and characterized by FTIR, 1 H-NMR and viscometry. Mainly intercalated and partially exfoliated PMMA/OBT nanocomposite was elaborated and evidenced by X-Ray diffraction (XRD) and transmission electron microscopy (TEM). The intrinsic viscosity of PMMA/OBT nanocomposite is much higher than the one of pure PMMA prepared under the same conditions. Differential scanning calorimetry (DSC) displayed an increase of 10 C in the glass transition temperature of the elaborated PMMA/OBT nanocomposite relative to the one of pure PMMA. Moreover, the TGA analysis confirms a significant improvement of the thermal stability of PMMA/OBT nanocomposite compared to virgin PMMA: the onset degradation temperature of the nanocomposite, carried out under nitrogen atmosphere, increased by more than 45 C.
Poly(styrene-co-methacrylic acid) containing 29 mol % of methacrylic acid (SMA-29) and poly(isobutyl methacrylate-co-4-vinylpyridine) containing 20 mol % of 4-vinylpyridine (IBM4VP-20) were synthesized, characterized, and used to elaborate binary and ternary nanocomposites of different ratios with a 3% by weight hexadecylammonium-modified bentonite from Maghnia (Algeria) by casting method from tetrahydrofuran (THF) solutions. The morphology and the thermal behavior of these binary and ternary elaborated nanocomposites were investigated by X-ray diffraction, scanning electron microscopy, FTIR spectroscopy, differential scanning calorimetry, and thermogravimetry. Polymer nanocomposites and nanoblends of different morphologies were obtained. The effect of the organoclay and its dispersion within the blend matrix on the phase behavior of the miscible SMA29/ IBM4VP20 blends is discussed. The obtained results showed that increasing the amount of SMA29 in the IBM4VP20/SMA29 blend leads to near exfoliated nanostructure with significantly improved thermal stability.
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