Crystallinity and mechanical properties of recycled, gamma irradiated HDPE/EPDM blends
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2017
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WORLD CHEMISTRY CONGRESS, 46th; ANNUAL MEETING OF THE BRAZILIAN CHEMICAL SOCIETY, 40th; IUPAC GENERAL ASSEMBLY, 49th
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High Density Polyethylene (HDPE) is a commodity and its wide range of uses comprises several plastic
processing in the industry due its conformability, high thermal and chemical resistance and a relative low cost
[1]. Also, this material can be recycled many times, which is an important characteristic to decrease the
environmental impact when plastic goods reach their end of life. EPDM is one of thermosetting elastomers
widely applicated in automotive industry because of its high mechanical, thermal and ageing resistance [2].
The mixture of this both components generate a material with high impact resistance and tensile strength at
break [3]. HDPE/EPDM blends are obtained by extrusion of these polymeric components with addition of
compatibilizers agents to achieve a homogenous and compatible mixture [4].
In this work the High Density Polyethylene (HDPE) matrix has been recycled four times from original
substrate and mixed to non-vulcanized EPDM rubber in proportions from 1 % to 10 % with no addition of
compatibilizer agents. The gamma irradiation process was applied at 50 kGy and 100 kGy to both original
and recycled blend samples.
Characterization of samples was performed by X-ray diffraction and stress-strain assay. These results
showed an increase of degree of crystallinity at recycled non-blended HDPE compared to this same
parameter to pristine HDPE. It was also observed that crystallinity decreases as EPDM concentration
increases. In irradiated samples, this parameter increase with high absorbed doses. The crystallite grain size
increases in EPDM concentration from 1 % to 5 %; however, this parameter decreases in blends with 10 %
of EPDM contents. This behavior suggests a co-crystallization effect on each polymeric component present
in the blend and it may explain the miscibility and compability of both components in this material without
addition of other agglutinative substances. The parameter stress at yield is high in pristine HDPE and low in
recycled HDPE; this parameter decreases with as EPDM concentration increases in the non-irradiated
polymeric blend. In irradiated blends the stress at yield increases in high doses. The irradiation process
promotes blend crosslinking, and it is evident in blends with high EPDM concentration where high stress at
100 % strain is observed.
Como referenciar
GABRIEL, LEANDRO; MOURA, EDUARDO; GERALDO, AUREA B.C. Crystallinity and mechanical properties of recycled, gamma irradiated HDPE/EPDM blends. In: WORLD CHEMISTRY CONGRESS, 46th; ANNUAL MEETING OF THE BRAZILIAN CHEMICAL SOCIETY, 40th; IUPAC GENERAL ASSEMBLY, 49th, July 07-14, 2017, São Paulo, SP. Abstract... Durham, NC, USA: International Union of Pure and Applied Chemistry, 2017. Disponível em: http://repositorio.ipen.br/handle/123456789/31177. Acesso em: 31 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.