Nuevas mezclas con base en polipropileno de baja viscosidad en fundido obtenidas mediante la adición de ciclobutilentereftalato

Abstract

 In this work, polymeric blends based on polypropylene (PP)
combined with cyclic butylene terephthalate (CBT) and maleic
anhydride grafted polypropylene (PP-g-AM) have been prepared
and studied for applications in thermoplastic composites and as
multimaterial composites for automotive industry. The principal
aim has been to reduce the melt viscosity of thermoplastic
matrixes to values similar to thermosetting ones in order to be
able to use more economic equipment for the thermoplastic
composites development.. For that purpose, different polymeric
blends of CBT/PP have been prepared, and the effect of
the addition of a PP-g-AM compatibilizer in the fibrillar
morphology and in the rheological behavior of the compounds
has been analyzed. For compatibilized blends, apart from a
substantial reduction of the size of CBT, a thixotropic behavior
has been observed, with a marked reduction of the viscosity at
the beginning of the shear test followed by a slight restoration
at the conclusion of the shear stress. Stationary values as low
as 20000 mPa.s have been registered which corresponds with a
reduction greater than 90% from PP viscosity.