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Silane functionalization of sodium montmorillonite nanoclay and its effect on rheological and mechanical properties of HDPE/clay nanocomposites
AbstractThe present research reveals novel results about the silane functionalization of sodium montmorillonite (Na-Mt) by comparing the interlayer space and thermal stability of the nanofiller at different initial silane concentrations. XRD and TGA results indicate an increased d001 and a high thermal stability for the silane-modified Na-Mt, which makes it a promising nanofiller for polymer nanocomposites. The amounts of intercalation and chemical grafting are estimated from TGA results using equations developed in this work; the silane intercalation is found to be the highest (0.504mmol/g clay) for 9mmol/g clay initial silane concentration, which is consistent with the d001-value (22.6Å). Intercalation increases with increase in initial silane concentration up to 9mmol (intercalated amount≈0.504mmol/g clay), then decreases at higher concentrations, e.g., 15mmol silane have an intercalated amount of 0.405mmol/g clay. However, the chemical grafting value for 15mmol silane is greater (0.18mmol/g clay) relative to that of the 9mmol silane initial concentration (0.15mmol/g clay). This can be explained by the occurrence of the side reactions at the edges for 15mmol silane, which reduces the intercalation amount. The rheological and tensile properties of HDPE/silane functionalized clay suggest that the storage modulus, damping factor and mechanical behavior of the composites depend on the clay nanofiller, as well as the nanocomposite preparation procedure (i.e. masterbatch technique). The tensile modulus showed ~15% enhancement for 85%HDPE/15%PEMA/2% modified clay over the pure polymer. TEM images revealed a well-dispersed clay structure for the HDPE/2wt% modified-clay/PEMA nanocomposite that is prepared through the masterbatch technique.
HighlightsSilane-modified nanoclay with different silane concentrations was synthesized.Two equations for the amounts of intercalation and chemical grafting were proposed.The optimized concentration was evaluated based on intercalation and d001-value.High silane concentration caused lower d001-value due to side reactions.TEM showed well-dispersed nanosheets in composites prepared by masterbatching.
Silane functionalization of sodium montmorillonite nanoclay and its effect on rheological and mechanical properties of HDPE/clay nanocomposites
AbstractThe present research reveals novel results about the silane functionalization of sodium montmorillonite (Na-Mt) by comparing the interlayer space and thermal stability of the nanofiller at different initial silane concentrations. XRD and TGA results indicate an increased d001 and a high thermal stability for the silane-modified Na-Mt, which makes it a promising nanofiller for polymer nanocomposites. The amounts of intercalation and chemical grafting are estimated from TGA results using equations developed in this work; the silane intercalation is found to be the highest (0.504mmol/g clay) for 9mmol/g clay initial silane concentration, which is consistent with the d001-value (22.6Å). Intercalation increases with increase in initial silane concentration up to 9mmol (intercalated amount≈0.504mmol/g clay), then decreases at higher concentrations, e.g., 15mmol silane have an intercalated amount of 0.405mmol/g clay. However, the chemical grafting value for 15mmol silane is greater (0.18mmol/g clay) relative to that of the 9mmol silane initial concentration (0.15mmol/g clay). This can be explained by the occurrence of the side reactions at the edges for 15mmol silane, which reduces the intercalation amount. The rheological and tensile properties of HDPE/silane functionalized clay suggest that the storage modulus, damping factor and mechanical behavior of the composites depend on the clay nanofiller, as well as the nanocomposite preparation procedure (i.e. masterbatch technique). The tensile modulus showed ~15% enhancement for 85%HDPE/15%PEMA/2% modified clay over the pure polymer. TEM images revealed a well-dispersed clay structure for the HDPE/2wt% modified-clay/PEMA nanocomposite that is prepared through the masterbatch technique.
HighlightsSilane-modified nanoclay with different silane concentrations was synthesized.Two equations for the amounts of intercalation and chemical grafting were proposed.The optimized concentration was evaluated based on intercalation and d001-value.High silane concentration caused lower d001-value due to side reactions.TEM showed well-dispersed nanosheets in composites prepared by masterbatching.
Silane functionalization of sodium montmorillonite nanoclay and its effect on rheological and mechanical properties of HDPE/clay nanocomposites
Asgari, Mohammad (author) / Abouelmagd, Ahmed (author) / Sundararaj, Uttandaraman (author)
Applied Clay Science ; 146 ; 439-448
2017-06-30
10 pages
Article (Journal)
Electronic Resource
English
Nanoclay , Silane , Montmorillonite , Intercalation , HDPE , Nanocomposite
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