Chemistry Essay

2402 Words10 Pages
Polymer is a substance made up of repeating molecules that are generally artificial. Polymers are created when catalysts, such as heat and pressure trigger reactions, and these reactions are known as polymerizations. There are both natural and synthetic polymers. Examples of natural polymers include wood, leather, cotton and also DNA. Isynthetic polymers are global too, with plastics being probably the best known. Polymers materials have become common in nearly every aspect of our daily lives. This ERT will focus on the two polymers (natural and synthetic??), and investigate the chemistry behind two chosen products with these polymers. Environmental and economic factors involved with producing these polymers will be analysed and discussed. Dispersion Forces: Dispersion forces (London forces) are present between molecules when they are almost touching. They are present between both non-polar and polar molecular compounds and ionic compounds. These forces are also the weakest type of intermolecular attraction. Dispersion depends on the polarizability of a molecule. For example Ultra high molecular weight polyethylene (UHMWP), which is used to make bullet prevent vests? UHMWP has a molecular weight more than 3000000g/mole. Dipole-dipole Forces: Dipole-dipole forces result from the attraction between polar molecules. Dipole-dipole attractions occur between the dipoles of two polar molecules and are caused by the permanent, uneven distribution of electrons, which is caused by the electronegativity differences of atoms in the molecule. These attractions are stronger than dispersion forces because the dipoles of polar molecules are permanent. Hydrogen Bonding: Hydrogen bonding is the strongest of all intermolecular forces. Hydrogen bonding occurs between different parts of the same molecule. The hydrogen bond involves a long pair of electrons on atom B.

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