Carlos Villavicencio - Preparation and Characterization NanoBioComposite  of Poli(Acid Lactic) and mixed PLA/Polyethylene with Sepiolite

Document created by Carlos Villavicencio on Apr 25, 2016Last modified by Carlos Villavicencio on Apr 25, 2016
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    ØIt can     be assumed that the presence of nano–clay     loading modified in this case, sepiolite     with CTAB, has a promoting     effect, according to the properties     studied.

    ØThe case     of morphology seems to exert a compatibilizer     effect between the two polymer phases, which originally     polymers are not compatible, due to unrelated     structures and their properties.

    ØRegardingthermalstudies (calorimetric), the presence of this burden, seems to exert an influence as a nucleating agent, observed in the slight shift of the crystallization peak temperature for the cases shown.


    ØAccording to the mechanical properties studied, this load, influence the changes listed in an increased stiffness of the material, even     when the presence of PE, a sufficiently     ductile material.




The use of thermoplastics and thermoplastic matrix composites has increased enormously in recent years. It has been said, the fillers are usually added to the polymer   matrix in order to improve   their thermal and mechanical   characteristics. Consequently,   considerable efforts have been   made to find suitable reinforcing   fillers.  Filled with organic particles are commonly added to commercial thermoplastic   resins to achieve economic as well as to favorably modify certain properties such as stiffness, heat distortion or heat and malleability. However, there are usually   compensated with some important properties such as hardness and ultimate   elongation at   break, which   usually deteriorate.  In fact, one of the largest main   disadvantages of using mineral filler is the use of processing equipment.   Also, the   properties of the composite are significantly affected by   the type of materials and the mixing   conditions.


Sepiolite is a magnesium–silicate fibrous, naturally occurring hydrated belonging to the family of the clay [Si12O30Mg8(OH)4(H2O) 4•8H2O]   as the ideal   formula of the   unit cell. Similar to other types of silicate   minerals, the   structure of sepiolite can be described as consisting of talc  a set   of narrow bands   formed by two layers of units (typically silica)   dimensional tetrahedral T2O5  continuous (T =   Si, Al, Be, etc.). Linked to a central octahedral sheet   or non–continuous   sheet of magnesium atoms by oxygen   atoms by reversing the direction of O, SiO4  tetrahedral apical, ie the addresses of the apical ends of the tetrahedral   sheet of silica reversed after six   tetrahedral units.  This feature determines the structure of needle–shaped   particles, which   have channels (3,6 x   10–6 Å) oriented along the   fibers and   can adsorb or fix   water and other liquids by adsorption.    Therefore, the rectangular channels occur or   occur in the longitudinal direction of the strips.  The   sepiolite can have a surface area of up to 200–300   g/m2, 0,2 to 4 microns length,   a width of   10–30 nm and thickness of  5–10 nm. Sepiolite usually appears   stuck together to build bundles of fibers that can form micro–agglomerates. This   fibrous structure with interior channels only allows the   penetration of organic and inorganic ions in the structure of sepiolite and sepiolite as signed great   importance to   industrial applications   sorptivity, rheological and catalytic   properties.

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