What is bulk polymerization technique?

Bulk polymerization or mass polymerization is carried out by adding a soluble radical initiator to pure monomer in liquid state. The initiator should dissolve in the monomer. The reaction is initiated by heating or exposing to radiation. As the reaction proceeds the mixture becomes more viscous.

What are polymerisation techniques?

Polymerisation Techniques Solution Polymerization – In this industrial polymerization method, a monomer is to be dissolved in the non-reactive solvent having an initiator or catalyst, which increases the speed of reaction. The polymer formed in the process is also soluble in the same non-reactive solvent.

What is the advantage of bulk polymerization?

Advantages of Bulk Polymerization: The polymer obtained is pure. Large castings may be prepared directly. Molecular weight distribution can be easily changed with the use of a chain transfer agent. The product obtained has the high optical clarity.

What are the uses of bulk and solution polymerization?

Both of bulk and solution polymerization used for manufacturing many polymers such as polystyrene, polyethylene, and polymethyl methacrylate for bulk polymerization and polyacrylonitrile, and polyesters such as nylon for solution polymerization.

Which monomer mixture is used in bulk polymerization?

undiluted monomer
4. Which of the following monomer mixture is used in bulk polymerization? Explanation: Bulk polymerization is the polymerization of undiluted monomer and is the simplest technique of polymer synthesis.

What is meant by gel effect in bulk polymerization technique?

Autoacceleration (gel effect, Trommsdorff–Norrish effect) is a dangerous reaction behavior that can occur in free-radical polymerization systems. It is due to the localized increases in viscosity of the polymerizing system that slow termination reactions.

How many types of polymerization techniques are there?

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 main components of the monomer mixture in bulk polymerisation?

1.3. Bulk polymerization, which may also be referred to as mass polymerization, involves a monomer and an initiator as the main components, without a solvent.

Which solvent is used in bulk polymerization?

Bulk polymerization is carried out in the absence of any solvent or dispersant and is thus the simplest in terms of formulation. It is used for most step-growth polymers and many types of chain-growth polymers.

What are the two types of polymerization?

Polymerization Reactions There are two basic types of polymerization, chain-reaction (or addition) and step-reaction (or condensation) polymerization. One of the most common types of polymer reactions is chain-reaction (addition) polymerization.

What is polymerization PDF?

polymerization;it is simply the process by which monomers are linked. together to generate long chains composed of repeat units.