Aspectos de degradação de geomembranas poliméricas de polietileno de alta densidade (PEAD) e de poli (cloreto de vinila) (PVC) / Aspects of degradation of high density poly ethylene (HDPE) and polyvinylchloride (PVC) polymeric geomembranes

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

This work evaluates the degradation of high density poly ethylene (HDPE) and polyvinylchloride (PVC) geomembranes after exposure to a variety of aggressive agents. HDPE (0.8, 1.0, 1.5 and 2.5 mm) and PVC (1.0 and 2.0 mm) geomembranes were exposed to weathering, leachate, heat (conventional and air oven), UV radiation, niobium (50°C) and water (65° and 85°C). The analyses were performed periodically with measurements of physical and mechanical properties. Thermal analyses were also carried out to quantify the variations at molecular level. Properties varied in function of the type of exposure and incubation period. Exposure to heat, for example, leads to decreases in deformability with increases in stiffness for the PVC geomembranes. Conversely, the HDPE geomembranes became softener. After exposure to weathering and leachate, deformability decreased for the PVC and increased for the HDPE. The PVC became stiffer while some oscillations in the rigidity occurred for the HDPE. These oscillations occurred mainly for the thicker specimens that showed trends of decreases in this property at the last period of observation. MFI and OIT tests were very useful in the quantification of the degradation processes.

ASSUNTO(S)

thermal analyses análises térmicas propriedades físicas e mecânicas degradação physical and mechanical properties degradation geomembrana geomembrane

ACESSO AO ARTIGO

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