Poly (Ethylene–Co–Vinyl Acetate)/Clay Nanocomposites: Effect of Clay Nature and Compatibilising Agents on Morphological Thermal and Mechanical Properties

Abstract

A series of nanocomposites based on an ethylene vinyl acetate (EVA) copolymer with two types of inorganic clays was\ud prepared by melt blending and film blowing.The tested clays were Hydrotalcite (a layered double hydroxide) and Dellite\ud 72T (an organo-modified montmorillonite) in different percentage, the exfoliation degree of which has been evaluated\ud in the presence of three types of compatibilisers. The nanocomposite morphology, thermal behaviour and mechanical\ud properties were analysed as function of the nature and content of clays and in the presence of compatibilisers

Water absorption and mechanical properties of PP/HIPS hybrid composites filled with wood flour

“…This was mainly attributed to the MFI value of polymers. The higher the value of MFI, the higher is the mobility of macromolecules and it is possible to obtain highest the elongation at break results [17]. This result was also observed for the wood-filled thermoplastic composites.…”

Ethylene vinyl acetate/nanoclay‐based pigment composites: Morphology, rheology, and mechanical, thermal, and colorimetric properties

“…The peak broadens, which indicates that there is an increase in the disorder of the clay layers and a better dispersion. When the diffraction peak disappears, it is accepted that the clay layers are completely exfoliated . Peak broadening was largely observed in the EVA composites [EV–NCP( X / Y ) set] obtained with nanopigments, as shown in Figure (a).…”

“…In general, the Young's modulus ( E ) values were quite similar, and only the samples with a higher concentration of NC or NCP (5 phr) presented a higher value. Several authors have observed an increase in E values in EVA nanocomposites with increasing concentration of NC, as was observed in this study. We believe that the increase in E was due to an increase in the rigidity provided by the NC, and as the specific surface area was increased, the stress was better transferred through the matrix to the NC.…”

“…On the other hand, almost all of the samples presented a lower energy absorbed at break ( E ab ) than the EVA. The presence of NC tactoids reduced the capacity of the material to absorb energy as a consequence of a reduction in the mobility of the polymer chain . Consequently, E ab decreased when the amount of nanoadditive increased.…”

Rheological and thermal properties of EVA-organoclay systems using an environmentally friendly clay modifiera

“…However, it is not always possible to obtain a sufficient interaction between the polymer and the organoclay to achieve the desired level of exfoliated structures. Previous studies have indicated that the nature and alkyl-chain length of the modifier affect the structure of nanocomposites [19,20] . The rheological behavior of nanocomposites may reveal information about the relationship of the polymer chain and organoclays structure.…”