Monomer means “one,” and monomers are small molecules containing one part. These molecules can join with other molecules to make a whole chain – a polymer.

Polymers are substances whose molecules have high molar masses and are composed of a large number of repeating units. There are both naturally occurring and synthetic polymers. Among naturally occurring polymers are proteins, starches, cellulose, and latex. Plastic is a polymer made in a lab or factory. It’s usually made from the carbon in oil or natural gas, but it can be made from other natural  products. 

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In 1907, the oldest recorded synthetic polymer was fabricated by Leo Baekeland, a thermosetting phenol-formaldehyde resin called Bakelite.  It became an excellent electrical insulator due to its hardness and high heat resistivity.

In 1920, Hermann Staudinger, published a paper on Macromolecules and Polymerization (chemical reaction in which two or more small, similar molecules are combined to make larger molecules).  He proposed that polymers consisted of long chains of atoms held together by covalent bonds (sharing of electron pairs between atoms).  From here there was intense research completed on macromolecules.

In 1941, Polyethylene (PE), a thermoplastic (meaning it can be melted to a liquid and remolded as it returns to a solid state) was developed.  It is now commonly used for making grocery bags and milk containers.  Polyethylene is a versatile synthetic resin made from the polymerization of ethylene.  Now we have different properties of Polyethylene that have been developed such as low density polyethylene (LDPE) and high density polyethylene(HDPE).