Question

how many types of plastic are there and name them

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Answer 1

Plastics can be divided into two major categories:

Thermoset or thermosetting plastics. ...

Thermoplastics. ...

Polyethylene terephthalate (PET or PETE): John Rex Whinfield invented a new polymer in 1941 when he condensed ethylene glycol with terephthalic acid.

The seven types of plastic

1) Polyethylene Terephthalate (PETE) Can it be recycled? ...

2) High-Density Polyethylene (HDPE) Can it be recycled? ...

3) Polyvinyl Chloride (PVC - U) Can it be recycled? ...

5) Polypropylene (PP) Can it be recycled? ...

6) Polystyrene or Styrofoam (PS) Can it be recycled? ...

7) OTHER. Can it be recycled?

Answer 2

Answer:

There are 2 types of plastics: Thermoplastic and thermosetting plastic.

The most most easiest way to remember the difference between these 2 is thermoplastics can change shape when heated at anytime whereas thermosetting plastic cannot change shape once moulded. Below are some more differences between them.

• Thermoplastic can be synthesized by the process called addition polymerization.
• Thermosetting plastics are synthesized by condensation polymerization.
• Thermoplastic is processed by injection moulding, extrusion process, blow moulding, thermoforming process, and rotational moulding. Thermosetting Plastic is processed by compression moulding, reaction injection moulding.
• Thermoplastics have secondary bonds between molecular chains. Thermosetting plastics have primary bonds between molecular chains and held together by strong cross-links.
• Thermoplastics have low melting points and low tensile strength. Thermosetting plastics have high melting points and tensile strength.
• Thermoplastic is lower in molecular weight, compared to thermosetting plastic.
• Thermosetting Plastic is high in molecular weight.

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