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 bimodal polymers?

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.

Is HDPE a resin?

HDPE is a strong, multipurpose resin that many associate with 1-gallon milk containers which use this material in its natural state. This material can be used for a variety of products and has excellent chemical resistance to most acids and bases along with organic compounds and certain solvents.

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.

Are there different grades of HDPE?

Normally available in two grades. 300 grade and 500 grade. the higher number denotes the density of the material and can improve on performance. The majority of HDPE is available in either black or white although 500 grade sheet is available in a range of colors.

What is the advantages of HDPE?

Advantages of HDPE include good low temperature impact resistance and excellent chemical resistance.

What are the negatives of HDPE?

The Disadvantages of HDPE Include

• Poor Weathering.
• Highly Flammable.
• Sensitive to Stress Cracking.
• Not Biodegradable.
• Can’t Be Composted.
• Not Resistant to Oxidizing Acids.
• Not Resistant to Chlorinated Hydrocarbons.
• High Thermal Expansion.

Are all HDPE the same?

The difference in strength exceeds the difference in density, giving HDPE a higher specific strength. It is also harder and more opaque and can withstand somewhat higher temperatures (120 °C/248 °F for short periods).

Is unimodal a normal distribution?

The normal distribution is an example of a unimodal distribution; The normal curve has one local maximum (peak). A normal distribution curve, sometimes called a bell curve. Other types of distributions in statistics that have unimodal distributions are: The uniform distribution.

What is meant by bimodal distribution?

Bimodal Distribution. A Bimodal distribution is a type of Continuous Distribution that has two peaks. It commonly occurs when the output from two process streams are mixed. Each individual process stream conforms to a normal distribution, but each has a different Mean and Standard Deviation.

What does it mean for a distribution to be unimodal?

A unimodal distribution is a distribution with a single clearly visible peak or a single most frequent value. This means the distribution’s shape has only one main high point.

What is bimodal distribution, and what are some examples?

Bimodal distributions are a commonly used example of how summary statistics such as the mean, median, and standard deviation can be deceptive when used on an arbitrary distribution. For example, in the distribution in Figure 1, the mean and median would be about zero, even though zero is not a typical value.