HDPE has very good electrical properties, especially its high dielectric strength, which makes it suitable for wire and cable. Medium to high molecular weight grades have excellent impact resistance, even at room temperature and even at low temperatures of F.
Linear low-density polyethylene LLDPE is almost inert to chemical reactions, does not react chemically with any substance, but just burns. Next: The main applications of stearic acid. Polyterephthalate plastics, mainly including polyethylene terephthalate PET and polybutylene t Application of sodium carboxymethyl cellulose CMC. E-mail: sales zbchiding. The level of branching gets reduced by having a more controlled polymerization process.
The use of catalysts allows for a more coordinated arrangement. Of monomers in the polymer chain. The reduced branching means that the polymer chains are more able to pack close. Thus resulting in a higher density compared to LDPE. Other than the higher density. HDPE also has superior properties like melting point and impact strength.
It also has a higher resistance to radiation and chemicals. Common applications of HDPE include. Bottle caps in drinking water bottles. It also finds use as shampoo bottles, pipes, and vegetable oil containers. MDPE has properties intermediate between low-density polyethylene and high-density polyethylene.
Its production was borne out of the need for a plastic that is a little stronger than LDPE. But it does not need to be as strong as HDPE. It has a moderate level of branching. The level of branching gets controlled by regulating the polymerization condition.
And the catalyst area available. MDPE finds use in applications like pond liners. And other low to moderate performance uses. In such applications, it is useful as a physical barrier and moisture resistant. Linear low-density polyethylene is a little advancement of low-density polyethylene.
Whereby the chains have shorter branches. These shorter branches are possible by the use of catalysts. And in some cases copolymerization. Copolymerization with other monomers like butane and propane. Which results in shorter branches, For example, propane only has the -CH3- pendant group. Whereas LDPE polymer chains can extend to branches with several carbon units. The shorter branches make for closer packing of the polymer chain. The idea is that it does not need the level of control of the polymerization process as HDPE.
So rather than preventing branching. The branches are shorter but still at the same level of branching. Although not as high a density as HDPE. It offers a lightweight plastic with similar density to LDPE but with more strength.
These films will also have improved toughness. The commercial advantage is being able to get material with superior properties. But without the expense required to make the polymer less branched. Applications of LDPE include plastic bags, pouches, and molded parts like toys. This form of polyethylene is a polymer with high flexibility. Its properties are like those of common elastomers.
When determining which polymer is right for your needs, you should ask yourself the following questions:. To sum it up, if your project requires durable or chemical resistant products, HDPE is probably the best option for you. We can help you choose the right products for your project. With our help, your next project will be a success!
Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. What are polyethylene? This is the reason for its flexibility, Stress Cracking — Is not sensitive to stress that would cause cracking, making it a smart choice when needing a material that can tolerate low temperatures. Here are some other qualities that make HDPE products different from other polyethylene: Thickness — 12 mils to mils; Density — 0.
How to choose the right polyethylene Now that you know more about the different polyethylene, how do you know which of the three is right for your project? The molecules all line up and strongly hold together as the film is stretched. The most common thickness range is from 0. It is very flexible, most often from 0. Due to its flexibility is conforms well to a variety of surfaces.
The downside is that this LDPE is not as strong or dense as some other types of plastic sheeting. It is not nearly as puncture resistant either. LDPE is used quite widely in construction, agriculture, surface protection applications, covers of all sorts, tarps and much more.
Its positive attributes is that it is stronger than LDPE and has a little more chemical resistant. It has a tighter cell structure making it more tear and puncture resistant.
0コメント