Elaboration and thermal analysis of nanocomposites based on poly(methyl methacrylate‐co‐4‐vinylpyridine) and Maghnia bentonite

Abstract

Nanocomposites based on an organically modified bentonite, from Maghnia Algeria (OBT) and a copolymer of methyl methacrylate with 4-vinylpyridine (PMM4VP) synthesized in dioxan at room temperature using a neutral Ni(II)a-benzoinoxime complex as a single component initiator, were elaborated via solution intercalation method and characterized by several techniques. X-ray diffraction and transmission electron microscopy investigations indicate that mainly exfoliated and intercalated PMM4VP/OBT nanocomposites were elaborated and that the degree of exfoliation decreases with an increase of the OBT loading. Thermal analyses of these nanocomposites compared with their virgin copolymer confirmed a significant improvement of their thermal stability as evidenced by an increase of 28 C in their onset degradation temperatures. In addition, differential scanning calorimetry displayed an increase in the range of 12-18 C in their glass transition temperatures relative to their virgin copolymer.

Thermal Behavior of Binary and Ternary Blends Based on Poly (Styrene‐co‐Allyl Alcohol)/Cellulose Acetate Butyrate and an Organically Modified Bentonite

“…Pure bentonite from Maghnia (Algeria) (PBT) was kindly supplied by Bentonite Company of Algeria and analyzed by the central laboratory of the Entreprise Nationale des Produits Miniers Non‐ferreux et des Substances Utiles (ENOF). This clay containing SiO 2 (55–65 wt%), Al 2 O 3 (12–18 wt%), Fe 2 O 3 (1–3 wt%), Na 2 O (1–3 wt%), CaO (1–5 wt%), K 2 O (0.76–1.75 wt%), and MgO (2–3 wt%), was organically modified by trimethyl hexadecyl ammonium chloride as previously described …”

“…This clay containing SiO 2 (55-65 wt%), Al 2 O 3 (12-18 wt%), Fe 2 O 3 (1-3 wt %), Na 2 O (1-3 wt%), CaO (1-5 wt%), K 2 O (0.76-1.75 wt%), and MgO (2-3 wt%), was organically modified by trimethyl hexadecyl ammonium chloride as previously described. [25][26][27] 2.2. Synthesis 2.2.1.…”