SILVA, M. A.; http://lattes.cnpq.br/2504013054091301; SILVA, Maristela Alves da.
Resumen:
The mechanical properties of low-density polyethylene composites
densities with different conventional fillers (talc and calcium carbonate) and
unconventional (atapulgite treated with mineral acids and untreated), were
studied. The evaluated properties were the tensile strength,
flexural strength and impact strength. The hardness and the degree of
crystallinity of the polymer and its composites. The experimental results
showed that atapulgite, due to its fibrous constitution, acted as a charge
reinforcement for polyethylene, which was evidenced by the increase in resistance
to the composite traction with up to 30% by weight of incorporated filler.
Comparisons made with low density polyethylene composites using
such as talc and calcium carbonate, classified as inert, have shown
that only hardness and impact resistance showed an increase, being
that the composite that presented the highest energy absorbed in the impact test was
or 20% by weight of the filler (talc) incorporated. The effect of
treatments of atapulgite with hydrochloric and nitric acids, and it was verified,
after treatment, increased porosity of the load and increased resistance
mechanics of the composite, attributed to the phenomenon of "mechanical coupling" and
greater physical adsorption of the charge to the polymer. Treatment with nitric acid was
which promoted a greater mechanical resistance to the composites, and the effect of the
The addition of fillers in polyethylene showed that only 10% by weight of
there was an increase in the degree of crystallinity and that, for the other
percentages (20 to 40% by weight), the charges acted as inhibitors of
crystallization.