LLDPE
As its name implies, Linear Low Density Polyethylene is a
lower density polymer (<0.939 g/cm3), increasing the material
flexibility. LLDPE is mainly used where large settlements
are anticipated for long term consolidation such as landfill
covers. Capping contaminants with LLDPE geomembranes, not
only makes it possible to control the release of carbon dioxide
and methane, by-products of the decomposition of contaminants,
but allows their reuse. The flexibility of the LLDPE is also
useful to the production process of the petroleum industry,
with the installation commonly required of temporarily liner
pit.
Linear low density polyethylene (LLDPE) is a substantially
linear polymer, with significant numbers of short branches,
commonly made by copolymerization of ethylene with longer-chain
olefins.
LLDPE has higher tensile strength and higher impact and puncture
resistance than LDPE. It is very flexible and elongates under
stress. It can be used to make thinner films, with better
environmental stress cracking resistance. It has good resistance
to chemicals and to ultraviolet radiation. It has good electrical
properties. However it is not as easy to process as LDPE,
has lower gloss, and narrower range for heat sealing.
It is used for plastic bags and sheets (where it allows using
lower thickness than comparable LDPE), plastic wrap, toys,
lids, pipes, buckets and containers, covering of cables, geomembranes,
and mainly for flexible tubing.
Polyethylene comes in very-low-density, low-density, linear
low-density, medium-density and high-density varieties. The
range for all geomembrane polymers falls within the general
limits of 0.85 to 1.5mg/l. LLDPE geomembranes are available
in a smooth, textured or single textured finish. The co monomers
used to produce the resin can include hexane, octane, or methyl
pentene.
Low density polyethylene (LDPE) is not compatible with high
density polyethylene (HDPE), as the former has poor environmental
stress crack resistance (ESCR) and will adversely affect the
ESCR performance of the compound.
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