Effect of organoclay impurities on mechanical properties of EVA-layered silicate nanocomposites

Abstract

The purification process of commercial organoclays and the beneficial effect of the impurities removal on the mechanical properties of the EVA exfoliated and intercalated nanocomposites are described in this paper. Mechanical properties such as Young modulus are improved, without any change in morphology in the exfoliated nanocomposites and an improvement of intercalation degree in the intercalated nanocomposite as demonstrated by rheological test is observed.

Thermal stability of nanoclay polypropylene composites by simultaneous DSC and TGA

“…The susceptibility of organo-modifiers and polymers toward thermal and thermooxidative degradation and the role of Al +3 ions on MMT platelets are the important concerns and recently they have been a subject of several studies [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Some of the aspects were reviewed recently in [35]].…”

Synthetic, layered nanoparticles for polymeric nanocomposites (PNCs)

“…Bellucci et al 140 compared the mechanical behavior of EVAc-19 with natural and semi-synthetic clays. The polymer was compounded with FM-MHT2EtOH and MMT-2M2HTA.…”

“…139 The rheological measurements were more sensitive to the aspect ratio and platelets distribution. Overall, better results were obtained with MMT-MHT2EtOH than with the FM-ODA.Bellucci et al 140 compared the mechanical behavior of EVAc-19 with natural and semi-synthetic clays. The polymer was compounded with FM-MHT2EtOH and MMT-2M2HTA.…”

Flammability and Thermal Stability in Clay/Polyesters Nano-Biocomposites

“…10.2 shows that the alkylammonium ions intercalated between the clay layers, decompose to volatile compounds in more than one step and in a larger temperature range (e.g. 200-500°C) [10,11,[17][18][19]. These differences are explained by the interaction clay-organic compound and they help in understanding the thermal behaviour of clay-organic polymer nanocomposites.…”

“…The first event of decomposition is usually due to the unconfined fraction of alkylammonium, that consists of alkylammonium surfactant which has not undergone the ion exchange reaction and is either complexed on the outer surface of the clay or within void spaces between primary particles or inside the interlayer space but in a peripheral position [10,[17][18][19]. This behaviour shows that the Lewis and/or Brønsted acid sites behave as catalytic sites affecting the initial stage of decomposition of the alkylammonium molecules accelerating the carbon-carbon bond scission at high temperature.…”