LDPE & LLDPE
Light Density Polyethylene & Linear Light Density Polyethylene
Their Diffrences
As we know, polyethylene is a thermoplastic polymer whose mechanical properties are dependent on the molecular density distribution and the type of its branches
Based on this, each polyethylene is placed in one of the following categories based on density and type of branching
Ultra-high-molecular-weight polyethylene (UHMWPE)
Ultra-low-molecular-weight polyethylene (ULMWPE or PE-WAX)
High-molecular-weight polyethylene (HMWPE)
High-density polyethylene (HDPE)
High-density cross-linked polyethylene (HDXLPE)
Low-density polyethylene (LDPE)
Linear low-density polyethylene (LLDPE)
Medium-density polyethylene (MDPE)
Very-low-density polyethylene (VLDPE)
Chlorinated polyethylene (CPE)
Each category has its own properties, for example, polyethylene that is included in the LDPE category are usually used in the packaging industry to produce plastic bags, while HDPEs are used in the production of detergent containers and trash bins, and UHWPEs are used in Bulletproof and medical device.
In this article, we are going to consider the properties and differences of two categories of Light Density Polyethylene (LDPE) and Linear Light Density Polyethylene (LLDPE), which are widely used in packaging industries
Light Density Polyethylene (LDPE) a homopolymer made of ethylene monomers, it has a branched structure similar to a tree
what is a homopolymer? a homopolymer is made of the monomers that are similar to each other
Monomers have low molecular weight, in fact they are the building blocks of a polymer, they have the capacity to form bonds with at least two molecules of another monomer to form a larger polymer chain under the name of polymerization
LDPE are used in the packaging industry in the production of plastic bags
Linear Light Density Polyethylene (LLDPE)
has a narrower molecular distribution and shorter branches than Light Density Polyethylene (LDPE)
Linear Light Density Polyethylene (LLDPE) is a copolymer, which means that it is formed from the combination of two or more different types of monomers
In fact, it consists of a combination of polyethylene with an olefin with a longer chain to show higher tensile strength in harsh environments
The polymerization process of monomers into copolymers is called copolymerization
LLDPE is used for plastic bags and sheets, plastic packaging, stretch packaging, bags, toys, covers, lids, pipes, buckets and containers, cable sheathing, geomembranes, and mainly flexible pipes
In summary, Light Density Polyethylene (LDPE) due to its low crystallinity, is more flexible and less dense than Linear Light Polyethylene (LLDPE), while LLDPE is softer and has higher environmental stress resistance and tensile strength than LDPE
Both LDPE and LLDPE are used in the production of plastic bags and have unique properties that make them suitable for different applications
LDPE:
Plastic bags for food and other items
Plastic cover for food packaging
Dispenser containers and bottles
Water pipes
Surface protection applications
LLDPE:
Stretchable and small packaging for food packaging
Bags for food and other items
Protective film for meat, bread and cheese
Pool liners and other films that need more flexibility and strength
Clothing packaging
Agricultural film
Carpet plastic film
All-purpose film
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