What is the mechanism of condensation polymerization?
When we talk about condensation polymerization, it is a form of a step-growth polymerization where smaller molecules or monomers react with each other to form larger structural units (usually polymers) while releasing by products such as water or methanol molecule.
What assumption is made when doing step-growth polymerization kinetics?
However, there are a few assumptions needed with this kinetic model. The first assumption is water (or any other condensation product) is efficiently removed. Secondly, the functional group reactivities are independent of chain length. Finally, it is assumed that each step only involves one alcohol and one acid.
What is kinetic of addition polymerization?
In the case of PDMS, an initiator reacts with the monomer to produce the polymer chain, which in turn can be extended through further reactions with the monomer. This reaction mechanism is known as addition polymerization, and is characterized by the absence of by-products.
Why is condensation polymerisation?
A condensation polymerization is a form of step-growth polymerization in which monomers and/or oligomers react with each other to form larger structural units while releasing smaller molecules as a byproduct such as water or methanol.
Why is condensation polymerization called step-growth polymerization?
The other common method is condensation polymerization (also called step-growth polymerization) in which the reaction between monomer units and the growing polymer chain end group releases a small molecule, often water as shown in Fig. 2.2. The monomers in this case have two reactive groups.
How can you define the difference between condensation polymers and step-growth polymerization?
Step growth polymerization is the formation of a polymer from bi-functional or multi-functional monomers. Step growth polymerization is also known as condensation polymerization. Unlike in chain growth polymerization, the polymer chains here are not formed at the beginning.
What are the differences between addition and condensation polymerization?
Addition polymerization is the process of repeated addition of monomers that possess double or triple bonds to form polymers. Condensation polymerization is a process that involves repeated condensation reactions between two different bi-functional or tri-functional monomers.
What is the relation between degree of polymerization and kinetic chain length for coupling termination?
Calculating chain length When the reaction goes to completion, [M] = 0, and then the kinetic chain length is equal to the number average degree of polymerization of the polymer. In both cases kinetic chain length is an average quantity, as not all polymer chains in a given reaction are identical in length.
Which is formed by condensation polymerization?
A condensation polymer is a polymer formed by condensation reactions. Monomers of condensation polymers must contain two functional groups so that each monomer can link up with two other monomers. One type of condensation polymer is called a polyamide.
How is a condensation polymerization reaction different?
Condensation polymerization is a process that involves repeated condensation reactions between two different bi-functional or tri-functional monomers….Difference Between Addition And Condensation Polymerization.
| Addition Polymerization | Condensation Polymerization |
|---|---|
| Addition of monomers results in polymers | Condensation of monomers result in polymers |
Which polymer is formed by condensation polymerization?
Condensation polymerization is a form of step-growth polymerization. Linear polymers are produced from bifunctional monomers, i.e. compounds with two reactive end-groups. Common condensation polymers include polyamides, polyacetals, and proteins.
Why is condensation polymerization slow?
Condensation polymers form more slowly than addition polymers, often requiring heat, and they are generally lower in molecular weight. The terminal functional groups on a chain remain active, so that groups of shorter chains combine into longer chains in the late stages of polymerization.