Synthesis of Polyamide-6/Montmorillonite Nanocomposites by Direct In-situ Polymerization Catalysed by Exchanged Clay

Kherroub, Djamal Eddine; Belbachir, Mohammed; Lamouri, Saad; Bouhadjar, Larbi; Chikh, Karim

doi:10.13005/ojc/290419

Cited by 34 publications

(12 citation statements)

References 18 publications

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“…For MMT-Na + , the peak of montmorillonite was found at 2θ = 6.27°, corresponding to a d(001) spacing of 14.06 Å. This increase in the d(001) spacing of MMT-Na, + also reported by Kherroub et al, 41 could be attributed to the aggressive ion exchange of the calcium cations (100 pm) by sodium cations (102 pm). Similar results were found in the work of El Acha-by et al, 38 Fourier transform infrared spectroscopy (FTIR).…”

Section: Characterization Of Montmorillonitesupporting

confidence: 69%

Elaboration of nanostructured polyurethane foams/OMMT using a twin-screw extruder in counter-rotating mode

Mahmoud

Safidine

Zeghioud

2018

JSCS

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In this work, a new elaboration method for nanostructured foam polyurethane/organo-modified montmorillonite (PUR/OMMT) by in situ polymerization is proposed. A twin-screw extruder in the contra-rotation mode combined with reaction injection molding (RIM) as the polymerization process was used. The blended polyols, copolymer polyol (CPP) were included between the OMMT layers via the twin-screw extruder. Both the formulation of the PUR and the inter-foliar distance in the montmorillonite (MMT) were optimized. The effect of some parameters such as OMMT content and catalyst (triethylenediamine for PUR 3 and triethylenediamine+diamino-1,2 propane for PUR 4) was also investigated. The synthesized materials (OMMT, PUR and PUR/OMMT) were characterized by different methods, i.e., Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results of evaluation tests, such as flammability and the tensile for the PUR 3+OMMT foams revealed that the optimum properties were obtained for PUR 3+2 % OMMT. The PUR 4 foam showed better mechanical and flame--retardant properties than the PUR 3 (r = -NCO/-OH = 1.15) foam. However, the PUR 4 + 2 % OMMT formula exhibited the most delayed flame diffusion and pronounced rigidity.Available on line at www.shd.org.rs/JSCS/ 1364 MAHMOUD, SAFIDINE and ZEGHIOUD motive, naval, furniture and building industries, and for shock absorption, padding and thermal or acoustic insulation. 1-5 PUR foams are present in all areas of daily life due to their various properties and applications. Despite all these advantages, these foams can constitute a peril in the event of fire. Currently, public opinion is very aware of this inflammability problem. Among the solutions to address this issue is the addition of organic flame-retardants in the polymer matrix. 6-8 However, most organic flame-retardants emit toxic gases.Nevertheless, both researchers and industrialists are interested in finding other solutions, such as the addition of graphite, 9-12 fibers, 13,14 montmorillonite, 15-26 nanocoating, 27,28 etc. The addition of montmorillonite in the polyurethane imparts noteworthy improvement to the relevant properties, especially if it is distributed on the nanometric scale. It enhances mechanical, thermal, barrier and flame retardant properties. 3 These improvements depend on the type of polymer, the ingredients used, the preparation process and the dispersion of the clay in the matrix. 3,29,30 Much work on the development of polyurethane foams modified with montmorillonite are reported in the literature. 15,[21][22][23][31][32][33] However, the use of a combination of grafted polyol (CPP) and polymeric diphenylmethane diisocyanate (PMDI) and/or diamino-1,2 propane as a catalyst has not been considered.The main goal of the present study consisted in the preparation of nanostructured foam polyurethane/OMMT with enhanced mechanical and flame-retardant properties. In order to incorporate the grafted polyols into the OMMT galleries, a twin-screw extruder oper...

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Section: Characterization Of Montmorillonitesupporting

confidence: 69%

Elaboration of nanostructured polyurethane foams/OMMT using a twin-screw extruder in counter-rotating mode

Mahmoud

Safidine

Zeghioud

2018

JSCS

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“…The intercalation step associates the protons present in the acid with the sheets. This new catalyst was used to initiate the polymerization of various monomers [6,7], and also to synthesize different types of nanocomposites [8][9][10]. We are interested in the polymerization of D8 (Scheme 1a) by Maghnite-H + .…”

Section: Introductionmentioning

confidence: 99%

Green Polymerization of Hexadecamethylcyclooctasiloxane Using an Algerian Proton Exchanged Clay Called Maghnite-H+

Kherroub¹,

Belbachir

Lamouri

2017

Bull. Chem. React. Eng. Catal.

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The purpose of this study was to synthesize polydimethylsiloxanes by heterogeneous catalysis, based on the polymerization of the hexadecamethylcyclooctasiloxane (D8) by an environment-friendly solid catalyst (Maghnite-H + ). Maghnite-H + is a natural Algerian clay of the montmorillonite type, prepared by activation with sulfuric acid, the impact of this activation was observable in the XRD spectrum, by the increase in the interlayer spacing (d001) resulting from the intercalation of hydronium ions between layers. The molecular structure of the obtained polymer was determined by different chemical methods of analysis such as IR, 1 H NMR, and 13 C NMR. The thermal behavior of the polysiloxane obtained was confirmed by DSC. In order to achieve the best possible yield and at the same time to get a polymer of high molecular mass, the operating conditions have been set at t = 8 h and T = 70 °C after the reaction was repeated several times. The average molecular mass and the polydispersity index were measured by GPC. A reaction mechanism has been suggested to show the action of the Maghnite-H + during the reaction.

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“…Several studies have been carried out at the LCP concerning the introduction of Maghnite-H + in the initiation of polymerization reactions [6][7][8]. In other works, Maghnite has been used as an inorganic reinforcement and as an initiator at the same time in different reactions in order to synthesize nanocomposite materials [9][10][11]. In this case, we will study the possibility of using Maghnite-H + as a catalyst to obtain a new class of widely used polymers which are silicones.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Activity of Maghnite-H+ in the Synthesis of Polyphenylmethylsiloxane under Mild and Solvent-free Conditions

Kherroub

Belbachir

Lamouri

et al. 2017

Period. Polytech. Chem. Eng.

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Synthesis of Polyamide-6/Montmorillonite Nanocomposites by Direct In-situ Polymerization Catalysed by Exchanged Clay

Cited by 34 publications

References 18 publications

Elaboration of nanostructured polyurethane foams/OMMT using a twin-screw extruder in counter-rotating mode

Elaboration of nanostructured polyurethane foams/OMMT using a twin-screw extruder in counter-rotating mode

Green Polymerization of Hexadecamethylcyclooctasiloxane Using an Algerian Proton Exchanged Clay Called Maghnite-H+

Catalytic Activity of Maghnite-H+ in the Synthesis of Polyphenylmethylsiloxane under Mild and Solvent-free Conditions

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