What is stepwise 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 step-growth polymerization explain the steps involved in this process?
Step-Growth Polymerization: Step-Growth Polymerization is a type of polymerization which sees bi-functional & multifunctional monomers reacting to form dimers, then trimers, then oligomers and finally long chain polymers.
What are the examples of step-growth polymerization?
Some examples of polymers produced via the step growth polymerization mechanism are polyesters, polyamides, polyurethanes, etc. Because of the stepwise mechanism of step growth polymerization, a high extent of reaction is required to achieve high molecular weight.
Which one of the following is step polymerization?
Solution : Polyester is a step growth polymer and others are chain growth polymers.
Which of the following is step polymerization?
Which one of the following is step polymerisation?
Solution : Step growth polymers (or condensation polymers) are prepared by reaction between two functional groups and thereby eliminating small molecules during polymerization. Nylon-6,6 is an example of step growth polymer.
What are the three stages of addition polymerization?
Addition polymerization (also known as free-radical polymerization) has three stages: initiation, propagation and termination.
What are the conditions of step polymerization?
Step growth polymerization relies on the presence of reactive functional groups within a monomer; usually these functional groups form the end groups of the monomers [8,9]. The presence of at least two functional groups on the monomers is required to form a long polymer chain (Table 2).
Is Bakelite example of step growth polymer?
Bakelite is an example of step growth polymer.
Which is not the three step polymerization?
Which one of the following is not the three step polymerisation? Explanation: Step polymerisation or the condensation polymerisation is not the three step polymerisation like initiation, propagation and termination.
Which of the following is an example of step growth polymer?
How many types of polymerisation are there?
two
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.
How many methods are to polymerization?
two methods
What are the two methods of polymerization? Polymerization can be classified into two types: chain-reaction (or addition) polymerization and step-reaction (or condensation) polymerization.
What is the first step in addition polymerization?
There are three steps in this type of polymerization: initiation, propagation, and termination. During initiation, the monomer acquires an active site to become a free radical. The addition of initiators or other approaches such as absorption of heat, light or irradiation can trigger the initiation process.
What is the difference between step-growth polymerization and addition polymerization?
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. Two growing chains can’t join together the way they can in a step-growth polymerization.
Is Teflon a step growth polymer?
Out of the given polymers, Teflon is a chain-growth polymer as the molecules of tetrafluoroethene (monomer) simply add together to form the polymer.
Is nylon-6 a step growth polymer?
Nylon-6,6 is an example of step growth polymerization as monomers adipic acid and ‘hexamethylenediamine are bifunctional and form bond with the loss of simple molecules.
Which one of the following is a step polymerization?
Which one of the following polymers may be classified as step growth polymer? Solution : Step growth polymers (or condensation polymers) are prepared by reaction between two functional groups and thereby eliminating small molecules during polymerization. Nylon-6,6 is an example of step growth polymer.
What are the different methods of polymerization?
What are the two methods of polymerization? Polymerization can be classified into two types: chain-reaction (or addition) polymerization and step-reaction (or condensation) polymerization.