Effect of ammonium and aminosilane montmorillonites organoclays on the curing kinetics of unsaturated polyester (UP) resin nanocomposites

International Conference and Exhibition on Polymer Chemistry

November 14-16, 2016 Atlanta, USA

Maria de los Angeles Vargas

Tecnol�³gico de Estudios Superiores de Ecatepec, Mexico

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

The curing kinetics of UP nanocomposites prepared by incorporating different amounts of two kinds of organo-montmorillonite (organo-MMT): trimethyl octadecacyl ammonium chloride (TMOA) and aminopropyl-triethoxysilane (APTES) were studied by non-isothermal differential scanning calorimetry (DSC) experiments. Small angle X-ray scattering (SAXS) was used for measuring the d-spacings in the modified organoclays and no intercalation UP into these clays was observed for the nanocomposites. HRTEM images showed dispersed and agglomerated platelets in UP/APTES 2 and 10 wt%. DSC analysis showed two peaks in UP resins and UP/organo-MMT and a decrease in the exothermal peaks temperature (Tp1 and Tp2) for nanocomposites with the heating rate as compared with those of neat UP system; thus, the higher the heating rate, the higher the curing reaction rate. This effect was more clearly on the UP/MMT-APTES nanocomposites. The effective activation energies (Ea) were determined with the modelfree isoconversional Starik�s method. Sestak-Berggren model was chosen to simulate the reaction rate with a good match achieved. Thermal gravimetric analysis showed that the cured UP/APTES at high concentration were slightly more stable than UP and TMOA.

Biography :

Email: angelesvh@yahoo.com