What is the difference between step and chain polymerization process?
Notice the difference from step growth. In chain growth, the polymer chain always grows one monomer at a time. In step growth, the polymer chain doubles with each step. As a result, the rate of growth of the polymer chain is very different in these two cases.
What is the difference between step reaction polymerization and addition polymerization?
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|
What is chain step growth polymerization?
Step-growth polymerization refers to a type of polymerization mechanism in which bi-functional or multifunctional monomers react to form first dimers, then trimers, longer oligomers and eventually long chain polymers.
What is difference between condensation step growth and addition chain growth polymers?
In a step-growth reaction, the growing chains can react with each other to form longer chains. This holds true for chains of all lengths. But in an addition polymerization, only the monomers can react with growing chains.
What happens in step growth polymerization?
A step-growth polymerization is a stepwise reaction between bi-functional or mult-ifunctional monomers in which high-molecular-weight polymers are formed after a large number of steps. In contrat to chain-growth, all monomers are reactive.
Why does living polymerization occur?
Living polymerization is a popular method for synthesizing block copolymers since the polymer can be synthesized in stages, each stage containing a different monomer. Additional advantages are predetermined molar mass and control over end-groups.
What are the two types of polymerization?
There are two general types of polymerization reactions: addition polymerization and condensation polymerization. In addition polymerization, the monomers add to one another in such a way that the polymer contains all the atoms of the starting monomers. Ethylene molecules are joined together in long chains.
What are the disadvantages of synthetic polymers?
They are not free from disadvantages. The raw materials used to produce them can get extinct, and disposing of synthetic polymers is a very difficult and time-consuming task. If proper care is not taken, it can result in environmental degradation.
What is chain growth polymerization with example?
Polycondensation is a kind of polymerization whose chain growth is based on condensation reaction between two molecules with various degree of polymerization. The typical example are polyesters, polyamides and polyethers. The degree of polymerization will increase steadily during the whole polymerization process.
Which of the following is step growth as well as condensation polymer?
Nylon-66, Bakelite, Nylon-6 are step growth Condensation polymers.
Which one of the following is a chain growth polymer?
Teflon is a chain growth polymer as the molecules of tetrafluoroethylene (monomer) simply add together to form the polymer. Hence Option A is the correct answer.
How is step growth and chain addition polymerization different?
Step growth polymerization takes place by reaction between monomers, oligomers and polymers. Chain addition polymerization takes place by repeated additions of monomers to the growing polymer chain. A polymer chain is formed at the beginning by the attachment of one monomer at a time.
What’s the difference between chain growth and step growth?
The main difference between chain growth polymerization and step growth polymerization is that the chain growth polymerization involves the growth a polymer chain at its ends whereas the step growth polymerization involves the combination of oligomers to form a polymer chain. 1. Libretexts. “Step-Growth Polymers—Condensation Polymers.”
How are oligomers used in step growth polymerization?
Step growth polymerization has oligomers instead of polymer chains at the beginning because the monomers involved in this process are composed of at least two different functional groups. Therefore, the monomers are able to attach to each other at any time.
Where does the growth of a polymer take place?
Molecular species of any length (oligomers) exist throughout the reaction, with the length distribution broadening and shifting to higher MW with increasing reaction time. takes place by reaction between monomers, oligomers, and polymers. takes place by repeated additions of monomers to the growing polymer chain.