[automatically translated] In recent years it has grown considerably interest in the nanocomposites. ie of materials characterized by a polymeric matrix in which are dispersed particles of nanometric dimension. In this context, the development of systems obtained by the combination of a biopolymer and a nanoclay can be an interesting way to realize new green materials technologically interesting. By virtue of this consideration has been conducted a chemical-physical study of dispersions of allosite nanotubes (HNTs) and nanodischi of laponite RD in biopolymer matrices (hydroxypropyl cellulose and pectin with a low degree of esterification) is in aqueous phase and in the solid phase (the bionanocompositi). The calorimeter studies and characterization of aqueous mixtures were allowed to investigate the interactions that control the surface adsorption of the biopolymer on nanoclay. The knowledge about the nature of these interactions is very useful to interpret the microscopic structure of the corresponding bionanocompositi.1 The morphology of the latter, prepared with the casting method, it was strongly dependent on the nature of the polymer. In particular, it was observed a sandwich structure composed of two surface layers of hydroxypropylcellulose between which are located the allosite nanotubes has been highlighted while a homogeneous distribution of HNTs in the pectin matrix. The different morphological characteristics have allowed to interpret the thermal, dielectric and wettability. Figure 2 schematically shows the correlation between the wetting properties (investigated by means of contact angle measurements) and the morphology of the nanocomposite. In conclusion, this work provides a contribution to the study of biopolymer composite systems / nanoclay potentially utiliazzabili to design new biomaterials for use in specific applications.
|Number of pages||1|
|Publication status||Published - 2011|