Estudo da influência da composição em materiais compósitos de polipropileno com fibras de vidro por pultrusão termoplástica nas propriedades mecânicas
Resumen
The objective of this work is to evaluate manufacture variations over thermoplastic
composite materials of polypropylene reinforced with glass fibers (FV) regarding
their tensile and flexural mechanical properties (PMs). The samples are produced
by a partner company located in São Carlos - SP, Brazil, and manufacture
variation are as described: geometry of the heated die (pin, MP, and waves, MO),
the use and the position of the conformer (d = 0 of the heated die, upper part of
the conformer at d = 0 and the lower part at a distance “d” and completely away
at a distance “d”), pulling speed (7 and 15 m/min), fibers with different surfaces
and different concentrations of maleic anhydride (MA). The results show that the
crystallinity of the materials was influenced by geometry of the heated die (MP ~
28% and MO = 39%). The position of the conformer was shown to influence the
PMs and the crystallinity, which the material C2.O1122-CM, at position d = 0,
had the lowest tensile (73 MPa) and flexural (67 MPa) values and the highest
crystallinity value (~35%) within the sample of the group with conformer.
Through the optical microscopy it shows that the conformer did not perform well
on providing a cylindrical and uniform pellet. The variations of pulling speed
showed that it influences crystallinity (C2.O115 ~ 34% and C2.O215 ~ 30%) but
there is no difference in PMs. Through a multivariate analysis of the group of the
samples with variation of FV and MA, it was possible to observe the influence of
each variable on the PMs and verify that the best condition was achieved with an
intermediate FV texture and lower concentration of MA with the sample C2.O212
(tensile ~ 91 MPa and flexural = 163 MPa).
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