CONCHEM 3RD LESSON

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  • Polymers are very large molecule structures that are chain-like in nature.
  • Polymers are defined as high molecular mass macromolecules, which are composed of repeating structural units, on a large scale, derived from their corresponding monomers.
  • Polymerization is the process of the formation of polymers.
  • Most polymers are made up of hydrocarbons (H and C).
  • Saturated hydrocarbons are those where each carbon is bonded to four other atoms.
  • Natural Polymers are found on living organisms such as plants and animals.
  • Semi-synthetic Polymers are derived from natural sources but are synthesized.
  • Synthetic Polymers are man-made polymers.
  • Linear Polymers are long and straight chains.
  • Branched Chain Polymers are linear chains with branches.
  • Cross linked or Network Polymers are formed from bi- and tri-functional monomers bounded by strong covalent bonds between linear polymers.
  • Addition Polymers, also known as Chain Growth Polymers, are formed by repeating addition of monomers.
  • Homopolymers are single monomeric species.
  • Copolymers are two different monomers.
  • Condensation Polymers, also known as Step Growth Polymers, are formed by repeated condensation between bi- and tri-functional monomers, with a byproduct of usually alcohol and water.
  • Elastomers are rubber-like solids with elastic properties.
  • Fibers are thread forming solids with high tensile strength and high modulus.
  • Thermoplastics Polymers are linear or slight branched chains, examples include thermoplastics like polyethylene, polystyrene, polyvinyls.
  • Thermosetting Polymers are crosslinked or heavily branched long chains.