Preparation of Nanocomposites Based on Poly (Methyl Methacrylate-co-4-Vinylpyridine) via Solution Method: Thermal Properties

摘要

Polymer nanocomposites, defined as a combination of only a few percent of a filler of at least one dimension in the nanoscale and a polymeric matrix, exhibit in many instances improved thermal and barrier properties compared to the virgin polymer. Contradictory results have been however reported in the literature concerning the effect of organomodified clays on polymer stability. In general, the clay has two opponent effects in the thermal stability of the polymer/clay nanocomposites: the barrier effect and the catalysis effect. We will in this contribution report in a first step on the elaboration via solution intercalation method and characterization by different and complementary techniques, of nanocomposites containing 2 or 4% of an algerian bentonite modified by Hexadecylammonium chloride (OBT) and a copolymer of methyl methacrylate containing 32 mol % of 4-vinylpyridine (PMM4VP32) synthesized as reported (1) at 30°C using a new neutral Ni(II)α-benzoinoxime complex (NBO) as a single component initiator in dioxan.