You have heard about extruded dielectrics, semi-conductive compounds, and cable jackets terms used for medium and high voltage cables. But do you know what and how they are made? XLPE power cable manufacturers are explaining the chemistry of polyethylene insulation. You will learn about the features making the polyethylene insulation popular among industrial clients.
The two major subdivisions of growing family plastic are thermo-sets and thermoplastic. Thermo-sets soften only once when heat is applied. It means you cannot soften them again once they are cooled and rigid.
Thermoplastics are different and can be softened again by heating. Polyethylene is a thermoplastic and in this post, we will learn about polyethylene and its copolymers.
The Physical Properties of a Polyethylene Resin is Regulated By,
Cross linked polyethylene or polyethylene copolymer resins are usually applied to wire and cable coating. Such types of resins may be compounded with higher content of carbon black or other fillers.
Controlled cross linking provides outstanding physical and heat resistant properties in a resin. When polyethylene molecules are cross-linked, the polymer is transformed to a thermo set from a thermoplastic and this is why you cannot recycle it.
You can crosslink the polyethylene by introducing peroxide and heating the mixture and irradiating the final product with gamma rays or electrons. Both the processes are free radical methods.
The arrangement of polyethylene
All the molecules of polyethylene are not arranged parallel to each other. Some of them are closely packed and lined up parallel in some areas of plastic mass in an orderly crystalline fashion. Rest is randomly arranged liked boiled noodles. This is known as amorphous structure.
Difference between amorphous and crystalline polyethylene
Completely amorphous polyethylene remains soft and greasy at room temperature and thus, you cannot use them for extrusion or molding applications. Crystalline polyethylene is harder and brittle in use.
The right blend of crystalline and amorphous regions is what will deliver brilliant end products. Which molecular properties affect resin and final product properties?
There are three basic molecular properties affecting the mechanical and thermal properties essential for processing polyethylene and acquiring premium end products:
- Short chain branching
- Average molecular weight
- Molecular weight distribution
The electrical properties of polyethylene resin are bit affected by these three stated factors. These properties make chemically inert polyethylene a great insulator for electrical cable and wire. These polyethylene materials are tough, flexible, and abrasion resistant and can withstand mechanical abuse.
It is the high dielectric strength and lower electric conductivity making polyethylene a perfect insulator for electrical power cable that can be applied for low and high transmission voltages.
Polyethylene is also ideal dielectric for all types of high frequency cables due to its low dielectric loss at high frequencies and outstanding mechanical properties.
XLPE Power Cable Manufacturers are aware of the power factor or polyethylene. They use XLPE polyethylene as insulator material to construct power cables for industrial use. If you wish to know more about XLPE polyethylene, you can write down to the experts today!