Polymericaly modified clays to preparation of polystyrene nanocomposite by nitroxide mediated radical polymerization and solution blending methods

Abstract

Polymericaly modified clays that contain an oligomeric poly (styrene-co-chloromethyl styrene) ammonium salt have been prepared and used to preparation of polystyrene (PS) nanocomposites. First, PS and poly(styrene-co-chloromethyl styrene) [P(St-co-CMSt)] were synthesized by nitroxide mediated living free radical polymerization (NMRP) by TEMPO iniferter .Then the copolymer was coupled with N, N-dimethyl hexadecyl amine to prepare polymeric modifier by anion exchange of chlorine group of chloromethyl styrene (CMSt) by quaternary amine. The synthesized polymeric modifier was mixed with nanoparticle of silica to change the property of clay surface from hydrophilic to hydrophobic via cation exchange of Na 1 with alkylammonium ions. For synthesizing of nanocomposites, we used polymericaly modified montmorillonite and PS that was synthesized by NMRP technique. Intercalated nanocomposites and in some cases, exfoliated or mixed intercalated/exfoliated nanocomposites of all of these polymers have been produced by solution blending method. The prepared materials were characterized by X-ray diffraction, Transmission electron microscopy, Fourier-transform infrared, 1 H nuclear magnetic resonance, and gel permeation chromatography techniques. Effect of layered silicates on thermal properties and glass transition temperature of PS was investigated using TGA and DSC techniques. POLYM.

A Review of the Synthesis and Applications of Polymer–Nanoclay Composites

“…The resulting composite is a promising material for 3D-printing-based applications. Abbasian et al [64] employed well-defined, polymerically-modified clay nanoparticles for the preparation of PS composite by nitroxide-mediated radical polymerization and solution blending methods. This approach produced exfoliated or mixed intercalated/exfoliated composites.…”

Insights into functional polymer-based organic-inorganic nanocomposites as leather finishes

“…Combining nanoparticles with polymer matrix to form nanocomposites has been explored for decades, while blending is recognized as the most facile and direct approach [35]. Blending can be accomplished by several ways, including mechanical blending, melt blending, solution blending or emulsion blending, which mainly depends on the nature of polymer [36][37][38]. Nowadays, blending method has been extensively employed in the industry by relatively wider acceptance of inorganic particles with various shapes, sizes, or characters [35].…”

Improvement of organoclay dispersion into polystyrene-based nanocomposites by incorporation of SBS and maleic anhydride-grafted SBS

“…In these research works, it was confirmed that dispersion and arrangement of clay layers into PS matrix were greatly enhanced in the presence of several modifiers. 16 –28 There are various types of block copolymers used for impact modification of PS, but commercially available styrene–butadiene–styrene (SBS) block copolymer is the most preferred candidate due to its ability to form distinct styrene (hard phase) and diene (rubber phase) domains with well-defined morphologies. Elastomeric character of SBS leads to improved mechanical ductility in addition to level up the compatibilization with an organoclay phase.…”