PINTO, M. R. O.; http://lattes.cnpq.br/9225790526299506; PINTO, Maria Roberta de Oliveira.
Abstract:
The influence of mica content and granulometry on mechanical, thermal and
thermo-mechanical properties of compression molded polypropylene composites was
investigated. Filler at 10-40% weight contents were added to polypropylene on an internal
mixer coupled to a Haake-Buchler's Rheocord System 90 Torque Rheometer. Experimental
results showed filler granulometry to affect the composite's properties and that best results
were obtained for the mica sieved through an ABNT n° 200 (d = 75 jura) sieve. It is believed
that this filler size promotes better filler-matrix interaction, better filler dispersion and a
greater number of tie molecules in the matrix cristalline structure. Mica surface treatment
with an UCARSIL system PCI A PC IB considerably increased the composite's properties up
to 20% filler content. By contrast mica surface treatment with an A-174 silane coupling agent
was ineffective to promote better properties in this system.