What is a bimodal HDPE?
What is a bimodal HDPE?
Bimodal HDPE is a type of HDPE that has both amorphous and crystalline regions. As a result, it benefits from the bimodality by having strength and stiffness of HDPE and high stress crack resistance and processability of a unimodal medium density polyethylene.
What are two properties of HDPE?
PROPERTIES. Flexible, translucent/waxy, weatherproof, good low temperature toughness (to -60’C), easy to process by most methods, low cost, good chemical resistance.
What is bimodal molecular weight distribution?
Bimodal molecular weight distribution of a resin indicates that a resin comprises to components of different molecular weight, and implicitly requires a relatively higher molecular weight component (HMW) and low molecular weight (LMW) component. Physical blending of two different polymers will produce a bimodal blend.
What is the strength of HDPE?
38 MPa
Although the density of HDPE is only marginally higher than that of low-density polyethylene, HDPE has little branching, giving it stronger intermolecular forces and tensile strength (38 MPa versus 21 MPa) than LDPE.
How is bimodal HDPE made?
Bimodal HDPE resins are produced by tandem processes that use reactor combinations of loop, slurry, and gas-phase by themselves or in combination with one another. In the first reactor, high amounts of hydrogen are fed with ethylene. This process leads to the formation of low-molar-mass polyethylene.
What are the mechanical properties of HDPE?
Mechanical Properties at 23 °C
| PROPERTY | UNIT | VALUE / RANGE |
|---|---|---|
| Tensile Strength, Yield at 23 C | MPa | 23.0 – 29.5 |
| Tensile Strength, Break at 23 C | MPa | 30.5 – 33 |
| Elongation, Yield | % | 9 – 18 |
| Elongation, Break | % | 600 – 1350 |
What are the properties of PET?
Polyethylene terephthalate (PET)
| Chemical formula | (C10H8O4)n |
|---|---|
| Monomers | Terephthalic acid, Ethylene glycol |
| General properties | Transparency to visible light and microwaves. Very good resistance to ageing, wear and heat. Lightweight, impact and shatter resistant. Good gas and moisture barrier properties |
What are the mechanical PROPERTIES of HDPE?
What is the advantage of HDPE?
Advantages. Advantages of HDPE include good low temperature impact resistance and excellent chemical resistance.
How do you increase tensile strength of HDPE?
Due to low glass transition temperature of HDPE (−110 ◦C), it is in its rubbery phase at −40 ◦C. By increasing temperature, strain at ultimate tensile strength increases, indicating higher ductility.