What are thermoplastic materials and what are the two types of thermoplastics and thermosets?

Thermoplastic materials can be deformed by heating a kind of plastic, the opposite of thermosetting plastics.

Thermoplastics refer to the fact that after the plastic is processed and cured and cooled, it can still achieve fluidity by heating again, and can be processed and molded again, that is to say, it has good reprocessing and reuse. For example, our common PVC, PE, PP, ABS and other common plastics.

Thermoplastic materials

Thermoplastic materials are just that:Plastics can be applied again, heated, processed, cured, cooled and molded. It has good reprocessing properties. Like pp, pe, absare common thermoplastic materials.

Thermoplastics refer to plastics that have the characteristics of heating and softening, cooling and hardening. Most of the plastics we use in our daily lives fall into this category. When heated, it softens to the point of flowing, and cooling becomes hard, a process that is reversible and can be repeated.

Thermoplastics are the most widely used plastics, which are formulated into plastics with thermoplastic resins as the main components and various additives. Under certain temperature conditions, the plastic can be softened or melted into any shape, and the shape remains unchanged after cooling; This state can be repeated many times and is always malleable, and this repetition is only a physical change, and this plastic is called a thermoplastic.

Polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyamide, acrylic plastics, other polyolefins and their copolymers, polysulfone, polyphenylene ether

According to the different physical and chemical properties of various plastics, plastics can be divided into two types: thermosetting plastics and thermoplastics. Thermoplastics: refers to plastics that melt after heating, can flow to the mold after cooling, and then melt after heating; Heating and cooling can be used to cause reversible changes (liquid and solid), which is called physical change.

The continuous use temperature of general-purpose thermoplastics is below 100, and polyethylene, polyvinyl chloride, polypropylene, and polystyrene are called the four major general-purpose plastics. Thermoplastics are divided into hydrocarbons, vinyl containing polar genes, engineering, cellulose and other types. It softens when heated and hardens when cooled, and can be repeatedly softened and hardened to maintain a certain shape.

Soluble in a certain solvent, it has the property of being fusible and soluble. Thermoplastics have excellent electrical insulation, especially polytetrafluoroethylene (PTFE), polystyrene (PS), polyethylene (PE), polypropylene (PP) have extremely low dielectric constant and dielectric loss, and are suitable for high-frequency and high-voltage insulating materials. Thermoplastics are easy to mold and process, but they have low heat resistance and are prone to creep, and the degree of creep varies with the load, ambient temperature, solvent, and humidity.

In order to overcome these weaknesses of thermoplastics and meet the needs of applications in space technology, new energy development and other fields, countries are developing melt-moldable heat-resistant resins, such as polyetheretherketone (PEEK), polyethersulfone (PES), polyarylsulfone (PASU), polyphenylene sulfide (PPS), etc. Composites with them as matrix resins have high mechanical properties and chemical resistance, can be thermoformed and welded, and have better interlayer shear strength than epoxy resins. For example, polyetheretherketone is used as the matrix resin and carbon fiber to make composite materials, and the fatigue resistance exceeds that of epoxy carbon fiber.

It has good impact resistance, good creep resistance at room temperature, good processability, can be used continuously at 240 270, and is a very ideal high-temperature resistant insulating material. The composite material made of polyethersulfone as matrix resin and carbon fiber has high strength and hardness at 200 degrees, and can still maintain good impact resistance at -100 degrees. It is non-toxic, non-combustible, with the least smoke and good radiation resistance, and it is expected to be used as a key component of the spacecraft, and can also be molded into a radar radome.