PET bottle

Synthetic resin

Natural resin

A substance with the characteristic of a natural resin is made artificially, and we are calling it the synthetic resin.
　　

Thermosetting resin

Thermosoftening resin

Cold hardening resin

　After heating materials and changing a shape, it is the thermoplastic resin which was cooled and hardened.
　　　

Polyethylene

Polyvinyl chloride

Polypolypyrene

　Polyethylene is PE,Polyvinyl chloride is PVC,and Polyethylene terephthalate is PET.

Atom

Molecule

Crude oil

　All material, such as a natural object or artificial material, is made of an atom.

A simple atom

Easy homework

A simple molecule

　"Poly" of polymer means a lot. The plastic consists of the molecule with which atoms are connected.
　

Polymer

Monomer

Trimmer

　The basic structure of a plastic is the chemical structure of a monomer.
Therefore, the character of a plastic changes by a monomer.

Russia

Japan

United States

　The United States enacted it in order to classify and recycle a plastic.
　　　

Ink

Rubber

Magnet

　Rubber is a natural plastic.
　　

Rubber tree

The flower of rubber

Grass of rubber

　If a crack is given to a rubber tree, what becomes the origin which makes rubber will come out.

Sulfuric acid

Hydrogen chloride

Sulfur

　By adding and heating sulfur to crude rubber, rubber becomes strong and can also have elasticity.

cool it

stir it

neglect it

Pine resin becomes hard only by leaving it alone, and becomes a transparent yellow plastic.
　　

Foaming object

All directions object

Firing object

　Styrene foam, a urethane mat, etc. are called "foaming object."
　　　

Plasticizer

Softening agent

Stabilizer

　Thanks to a plasticizer, we adjust the hardness of a plastic freely and can also make the leather and water pipe of a sofa from the same kind of plastic. 　

Polypyrene

Polypilon

Polypropylene

　The plastic which exists truly in three choices is only polypropylene.

Polyethylene

Polyethylene terephthalate

Polyvinyl chloride

　Polyethylene is used for daily necessaries and polyethylene terephthalate is used for a PET bottle.
　

Because it is light

Because it is cheap

Because it is strong against a shock

　Since the plastic can change character according to a use, we can also make a plastic which is strong against a shock.

Styrene foam

Polyethylene terephthalate

Polyvinyl chloride

　Since there is the heat insulation effect in the bubble of styrene foam, we use it.
　　　

Because it can be printed finely

Because it is light

Because it is cheap

　Since we do not understand what is contained unless it is printed, the styrene foam which can be printed finely is used.
　　

Mold

Microbe

Light

　Since a plastic lets light and oxygen pass, it is important that they prevent degradation of the food of a cause.

Yes

No

There is, if it is not oxygen but hydrogen.

　It's Polyvinyl alcohol(PVAL).

Prosthetic device

Mobile phone

Stationery

Since it becomes the minimum about contamination by bacteria or a virus, the plastic is suitable as a charge of medical material.
　　

It is heavy.

It is bitter.

It is soft.

　Although PVAL has the strong point in which it does not let oxygen pass, there is a weak point where it is soft and weak.
　　　

Around 1900

Around 1950

Around 2000

　After about the middle of the 20th century,a plastic began to be used . 　

It remains still.

It will be decomposed.

It melts.

　Since a plastic is stable material, if it is abandoned in nature, it will remain into environment forever.

We burn it.

We put it around there.

We bury it.

　Since poisonous gas will be emitted, or there is much calorific value and a plastic will damage an incinerator if it burns, we bury it or recycle it. 。
　

Polyphenol

Xylitol

Dioxin

　We are advancing improvement to the incinerator which can burn a plastic by carrying out countermeasures against dioxin.

Reduce

Reuse

Recycle

　It's "Recycle".
　　

Refuse

Rehearsal

Returns

　It's Refuse.