Preview

Polymerization Reactions

Better Essays
Open Document
Open Document
1879 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Polymerization Reactions
Polymerization reaCTIONS polymers are high-molecular-weight compounds, fashioned by the aggregation of many smaller molecules called monomers.
Ex. plastics that have so changed society and the natural and synthetic fibers used in clothing are polymers.
Classification of polymers
Homopolymers - consist of repeated long chains or structures of the same monomer unit.
Ex. PVC(polyvinyl chloride)
Copolymers - polymers that consist of more than one molecule.
Trimers - molecules consisting of 3 monomer units.
Tetramers- 4 monomer-unit compounds polymerization In polymer chemistry, is a process of reacting monomer molecules together in a chemical reaction to form polymer chains or three-dimensional networks.
In IUPAC definition, it is the process of converting a monomer or a mixture of monomers into a polymer. occurs via a variety of reaction mechanisms that vary in complexity due to functional groups present in reacting compounds and their inherent steric effects.
Two basic ways to form polymers
1. linking small molecules together, a type of addition reaction.
2. combining two molecules (of the same or different type) with the elimination of a stable small molecule such as water.
This latter type of polymerization combines addition and elimination reactions and is called a condensation reaction .
Types of polymerization reactions
Addition Polymerization
Chain Polymerization/ Free radical Polymerization
Condensation Polymerization
Addition Polymerization Also known as Chain-growth polymerization involves the linking together of molecules incorporating double or triple carbon-carbon bonds.
These unsaturated monomers (the identical molecules that make up the polymers) have extra internal bonds that are able to break and link up with other monomers to form a repeating chain, whose backbone typically contains only carbon atoms.
Addition Polymerization involved in the manufacture of polymers such as polyethylene, polypropylene, and

You May Also Find These Documents Helpful

  • Powerful Essays

    Ap Biology Unit 1 Summary

    • 2660 Words
    • 11 Pages

    * Condensation reaction/dehydration synthesis: a reaction that creates a covalent bond between two interacting subunits. Removal of H from one functional group and an OH from the other, and the H come together to form a water molecule (H2O). Anabolic process because it results in the construction of large molecules from smaller subunits…

    • 2660 Words
    • 11 Pages
    Powerful Essays
  • Good Essays

    Monomers join together to form polymers by removing water to form covalent bonds. It takes OH from sugar on the 5th carbon and takes H from phosphate group to…

    • 877 Words
    • 4 Pages
    Good Essays
  • Good Essays

    Hydrolysis: a chemical reaction that breaks bonds between two molecules by the addition of water;…

    • 1171 Words
    • 4 Pages
    Good Essays
  • Powerful Essays

    Combination reactions, also known as synthesis reactions, involve the combination of two or more substances into a single new substance:…

    • 2947 Words
    • 12 Pages
    Powerful Essays
  • Good Essays

    Polyurethane Analysis

    • 666 Words
    • 3 Pages

    the polyaddition reaction, which is a special case of polycondensation, with the difference that the reaction product is exclusively the polymer. In the classical polycondensation reactions, the products are: the polycondensation polymer and a low molecular weight (MW) compound (water, alcohols, and so on). The fact that in the polyaddition reactions the product is only the polymer is of great technological importance, especially for the purity and the morphology of the resulting macromolecular…

    • 666 Words
    • 3 Pages
    Good Essays
  • Better Essays

    Apple sauce lab

    • 700 Words
    • 7 Pages

    chemical reactions on the substrate (kind of like a catalyst). a catalyst is any substance which…

    • 700 Words
    • 7 Pages
    Better Essays
  • Satisfactory Essays

    biology unit 4

    • 341 Words
    • 2 Pages

    Dehydration Synthesis (Condensation): two hydrogen atoms and one oxygen atom are removed from the monomers to form water, and the two monomers are joined together.…

    • 341 Words
    • 2 Pages
    Satisfactory Essays
  • Powerful Essays

    Biol1002 Notes Usyd

    • 2028 Words
    • 9 Pages

    * RNA: ribonucleic acid: polymer made up of a number of identical subunits—(nucleotide monomers). They are polymers that can:…

    • 2028 Words
    • 9 Pages
    Powerful Essays
  • Satisfactory Essays

    Document2

    • 480 Words
    • 2 Pages

    What are polymers? They are substances made up of many atoms in a repeated pattern. When two atoms are joined together by chemical ties they form molecules.…

    • 480 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Polymers a large molecules made up of a chain of smaller molecules, known as monomers. The monomers that a polymer is made up of decide its structure and therefore it's function. These monomers are linked and coiled in a very specific manor giving the polymer a specific tertiary structure (an extensively coiled and linked polymer chain caused as a result of the formation of more bonds forming). This tertiary structure is crucial to the function of a polymer as it denotes the necessary shape of the complementary molecule. This is easier explained through an example.…

    • 808 Words
    • 4 Pages
    Good Essays
  • Good Essays

    Ap biology notes

    • 1204 Words
    • 5 Pages

    Dehydration Reaction- A chemical reaction in which two molecules become covalently bonded to each other with the removal of a water molecule.…

    • 1204 Words
    • 5 Pages
    Good Essays
  • Good Essays

    Lab Stuff

    • 2229 Words
    • 9 Pages

    Cells make large macromolecules by bonding smaller molecules together into chains called polymers (from the Greek polys, "many," and meris, "part"). Polymers are large molecules composed of many identical or similar subunits called monomers.…

    • 2229 Words
    • 9 Pages
    Good Essays
  • Good Essays

    Biology

    • 2208 Words
    • 8 Pages

    How do you build a polymer? How do you breakdown a polymer? Build by dehydration from monomers and take out wather, break down by hydrolysis add water to form monomers…

    • 2208 Words
    • 8 Pages
    Good Essays
  • Good Essays

    Types of Polymerisation

    • 4714 Words
    • 19 Pages

    Techniques of Polymerisation: 1) Bulk or Mass Polymerisation: Method: Pre-polymerisation stage. Monomer is in liquid state and initiator dissolved in monomer is taken in a vessel and heated initially to poln temp. by a hot jacket to initiate the reaction. Monomer is added with constant agitation/ stirring for effective heat and mass transfer. Polymerisation reaction involves extensive bond formation in homogenous system and is exothermic. (25 – 30% poln) Post poln stage :- As the reaction proceeds, the reaction mixture becomes viscous and is then transferred to the main reactor and is placed in a thermostat maintained at a higher temperature. After a known period of time the content is poured into methanol when the polymer gets precipitated out. It can be extracted into rods or fabricated into sheets. The polymer product being free from any contaminations except the monomer can be used without further purification. BP is mainly used for the manufacture of condensation reaction where the reactions are mildly exothermic. Eg PS, PVC, PMMA. Advantages • Method is simple and needs simple equipment • Percentage of conversion is high – 100% • Easy work up procedure, no isolation or purification steps. Disadvantages: • As reaction proceeds agitation is difficult as the product becomes more and more viscous as concentration of mass increases. • Heat control is more difficult as poln progresses. The viscosity increases and local hot spats develop due to difficulty in agitation. Uncontrolled exothermic reactions lead to sudden temperature rise that may result in explosion. • The gel effect observed – As poln proceeds, viscosity increases, termination becomes difficult. Rate of poln increases rapidly. Auto acceleration of pol rate with decrease in termination rate is gel effect or auto acceleration. • The polymer molecules with wide range of molecular masses will be obtained • Removal of the last traces of monomers becomes extremely difficult 2) Solution…

    • 4714 Words
    • 19 Pages
    Good Essays
  • Good Essays

    Chemical Reaction Essay

    • 476 Words
    • 2 Pages

    Lastly, we have an Acid/Base reaction. This is considered to be a neutralization reaction (meaning they even each other out) that occurs when an acid and base are mixed together. An example of this is the reaction between hydrochloric acid and sodium…

    • 476 Words
    • 2 Pages
    Good Essays