An addition polymer is a polymer which is formed by an addition reaction, where many monomers bond together via rearrangement of bonds without the loss of any atom or molecule. This is in contrast to a condensation polymer which is formed by a condensation reaction where a molecule, usually water, is lost during the formation.The discharge of plastics after usage cause a pollution problem ,to decrease this problem we depend on recycling especially for thermoplastics.
To assist recycling of disposable items, the Plastic Bottle Institute of the Society of the Plastics Industry devised a now-familiar scheme to mark plastic bottles by plastic type. A plastic container using this scheme is marked with a triangle of three "chasing arrows", which encloses a number giving the plastic type:
- PET (PETE), polyethylene terephthalate
- HDPE, high-density polyethylene
- PVC, polyvinyl chloride
- LDPE, low-density polyethylene,
- PP, polypropylene
- PS, polystyrene
Some products and the type of plastic they are manufactured from:
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| LDPE |
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| Polyethylene bag |
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| polystyrene |
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| PVC pipes |
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| PP |
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| HDPE |
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