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Polymers introduction

PostPosted: Wed Oct 17, 2012 10:27 pm
by raviraj
Polymer - a large molecule consisting of (at least five)
repeated chemical units (`mers') joined together, like
beads on a string. Polymers usually contain many more
than five monomers, and some may contain hundreds or
thousands of monomers in each chain.
Polymers may be natural, such as cellulose or DNA, or
synthetic, such as nylon or polyethylene

Many of the most important current research problems involve
polymers. Living organisms are mainly composed of
polymerized amino acids (proteins) nucleic acids (RNA and
DNA), and other biopolymers. The most powerful computers -
our brains - are mostly just a complex polymer material soaking
in salty water! We are just making first small steps towardsunderstanding of biological systems.

Polymer molecules:
 Polymer molecules are very large: macromolecules
 Most polymers consist of long and flexible chains with
a string of C atoms as a backbone.
 Side-bonding of C atoms to H atoms or radicals
 Double bonds are possible in both chain and side bonds
 A repeat unit in a polymer chain (“unit cell”) is a mer
 A single mer is called a monomer