Polymer

Polymer

1. Polimer comes from the greek poli=many and mer=molecules

   • Polymers can be tuned as we want for the job that we want, their properties allow us to build a polimer as a LEGO till the polimer fit the Job

2. Polymers is how we know the union of many monomers.

   • It can be represented as
     • A-A-A-A
     • (-A-)x Where x is the variable of how many times A repeats

3. As we can see the name of polymers varies from the functional group or molecule that is repeated

   • Polyesters
     • Is formed when you have many "ester" (functional group)
   • Examples
     • Uses
       • Polymers are used in the computers manufacturing
       • We use plastic in tools, for example the heat-schrincable cover for cables
       • Polymers are used for isolating the charges in a a elecetrical system
     • Polymers
       • Poliethylene is used in common plastic bags
       • Polipropilene is a hard plastic that can support straight impacts therefore is used in training equipment
       • Polystyrene is a polymer used for make heat resistant (low cost) glasses or for packing fragile things

4. Characteristics

   • It can change a lot, the properties depend of 3 factors
     • Connectivity
       • If the repeating molecule repats in a linear pattern or a branched pattern
     • Molecular Weight
       • How many times the constant molecule repeats
     • Composition
       • If we add another molecule to the reapiting pattern the properties chnge
         • Homopolymers are the polymers that have only one functional group
         • heteropolimers are the ones that have a altered composition, so they have more than one functional group
       • Example: (-a-) "normal" but if we add "b" the properties change (-a-)(-b-)(-a-)
     • Something we have to mention is that when we do a polymer double or triple bonds are eliminated

5. Types

   • Thermoplastics are molecules that have no covalent bonding, just intermolecular
   • Thermosets have many covalent bonds in the chain and have a 3d structure
   • Elastomers are molecules with a chain structure, therefore they can stretch
   • Steric Structure
     • Side Chains
       • Stereoregular
         • Regular Chain (pattern)
       • Atactic
         • Unregular Chain