Mechanism of Polymerization. Generally, polymerization consists of three steps which include initiation, propagation, and termination. As for the reaction mechanism, the process of polymerization mainly involves two different methods. These include the step-growth mechanism and chain-growth mechanism.

What is the mechanism of polymerization reaction?

Mechanism of Polymerization. Generally, polymerization consists of three steps which include initiation, propagation, and termination. As for the reaction mechanism, the process of polymerization mainly involves two different methods. These include the step-growth mechanism and chain-growth mechanism.

What are the different types of polymerization mechanism?

There are two basic types of polymerization, chain-reaction (or addition) and step-reaction (or condensation) polymerization.

What is polymer structure?

A polymer is composed of many simple molecules that are repeating structural units called monomers. A single polymer molecule may consist of hundreds to a million monomers and may have a linear, branched, or network structure.

How are polymers classified on the basis of mechanism of polymerization?

Polymers can also be classified on the basis of mode of polymerisation into two subgroups. Addition polymers: The addition polymers are formed by the repeated addition of monomer molecules possessing double or triple bonds, e.g., the formation of polythene from ethene and polypropene from propene.

What is polymer explain the free radical and cationic mechanism of polymerization?

A free Radical Polymerization is a polymerizing approach by which successive addition of free radicals takes place to form a polymer unit. It is a type of chain-growth polymerization, with a cationic, anionic and coordination polymerization.

What is the polymer principle?

As you will see in the following text, the four most fundamental molecular characteristics of polymer chains that determine the physical behavior of a polymer are chain stiffness, chain composition or polarity, chain architecture or regularity, and molecular mass.

What are the three structure of polymers?

The four basic polymer structures are linear, branched, crosslinked, and networked.

What determines the structure of a polymer?

Polymers are a range of materials that are composed of long chains of repeating molecules called monomers. The long molecular chains intertwine to form complex compositional arrangements. The backbone of these long molecules is the carbon, C, atom.

How many types of polymers are on the basis of structure?

Polymers can be classified into three main types based on structure. These are linear polymers, branched chain polymers and cross- linking polymers. Linear polymers are formed of long, straight chains.

What are the two types of polymerization reactions?

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.

How do you represent polymerization in chemistry?

The polymerization can be represented by the reaction of a few monomer units: The bond lines extending at the ends in the formula of the product indicate that the structure extends for many units in each direction.

How do functional groups affect the length of a polymer chain?

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. The presence of polar functional groups on the chains often enhances chain-chain attractions, particularly if these involve hydrogen bonding, and thereby crystallinity and tensile strength.

How are addition polymers made?

The reaction is done at high pressures in the presence of a trace of oxygen as an initiator. Some common addition polymers are listed in Table 27.8. 1. Note that all the monomers have carbon-to-carbon double bonds.