What is meant by chain polymerization?
IUPAC definition. Chain polymerization: Chain reaction in which the growth of a polymer chain. proceeds exclusively by reaction(s) between monomer(s) and active site(s) on the polymer chain with regeneration of the active site(s) at the end of. each growth step.
How are polymers formed by chain polymerization mechanism?
A ‘chain polymerization’ is a chain reaction in which the growth of a polymer chain proceeds exclusively by reaction(s) between monomer(s) and active site(s) on the polymer chain with the regeneration of the active site(s) at the end of each growth step.
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 are the three major reactions that occur during chain polymerization?
Usually an initiator compound reacts with the monomer to start the reaction, and the mechanism of chain polymerization consists of three phases, called initiation, propagation, and termination.
What type of polymers they are based on polymerization?
Polymers range from familiar synthetic plastics such as polystyrene to natural biopolymers such as DNA and proteins that are fundamental to biological structure and function. Polymers, both natural and synthetic, are created via polymerization of many small molecules, known as monomers.
How can you differentiate the types of polymerization reaction?
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 happens in a polymerisation reaction?
Polymerisation is the reaction of monomer molecules to form long chain polymer molecules. A monomer is a small reactive molecule that can be joined with other monomers to form long chains. Addition polymerisation is the type of polymerisation reaction that occurs when you take the monomers and simply add them together.
How many types of chain polymerization are there?
1.1. Chain initiation—usually by means of an initiator which starts the polymerization process. The reactive initiation molecule can be a radical (free radical polymerization), cation (cationic polymerization), anion (anionic polymerization), and/or organometallic complex (coordination polymerization).
Which of the following do not undergo the chain polymerization?
Which of the following do not undergo the chain polymerisation? Explanation: The polyester do not undergo the chain polymerisation. The compounds having the double bond undergo chain polymerisation. Olefins, vinyl, allyl and dienes undergo chain polymerisation.
What is the mechanism of addition polymerization?
We indicated in Chapter 1 that the category of addition polymers is best characterized by the mechanism of the polymerization reaction, rather than by the addition reaction itself. This is known to be a chain mechanism, so in the case of addition polymers we have chain reactions producing chain molecules.
What are the different types of polymerization?
1 Step Growth Polymerization. In step-growth polymerization, the polymers are formed by the independent reaction between the functional groups of simple monomer units. 2 Chain Growth Polymerization. In chain-growth polymerization, the molecules of the monomers are added together to form a large chain. 3 Polymerization Chemical Reaction.
What is a termination reaction in polymerization?
The chemical reactions which terminate polymer chain growth are also an important part of the polymerization mechanism. Killing off the reactive intermediate that keeps the chain going is the essence of a termination reaction. Some interesting polymers can be Chapter Three, Chain-growth polymerization, Version of 1/5/05
What is cationic polymerization?
Polymerization reactions classified on the basis of using cations with the reacting monomers are known as Cationic Polymerization. In this polymerization, both the initiation and propagation steps occur with the help of a cation. So, the chain growth occurs when the cation transfers its charge to the reacting monomers to make them reactive.