Sage-Tips

Why bulk polymerization is best for all polymerization techniques?

Bulk polymerization has several advantages over other methods, these advantages are: The system is simple and requires thermal insulation. The polymer obtained is pure. Large castings may be prepared directly.

What is the difference between suspension polymerization and emulsion polymerization?

The main difference between suspension and emulsion polymerization is that suspension polymerization requires a dispersing medium, monomer(s), stabilizing agents and initiators whereas emulsion polymerization requires water, monomer and a surfactant.

Why is bulk polymerization the simplest?

Bulk polymerization is carried out in the absence of any solvent or dispersant and is thus the simplest in terms of formulation. Bulk polymerizations are also difficult to stir because of the high viscosity, associated with high-molecular-weight polymers.

What is emulsion and bulk polymerization?

Emulsion polymerization is a type of radical polymerization that usually starts with an emulsion incorporating water, monomer, and surfactant. Rather than occurring in emulsion droplets, polymerization takes place in the latex/colloid particles that form spontaneously in the first few minutes of the process.

What are the various types of polymerization techniques such as bulk emulsion solution suspension etc )?

Emulsion Polymerization – It is a process of radical polymerization which involves a monomer, water that incorporates emulsion, and surfactant. Suspension Polymerization – In this process of heterogeneous radical polymerisation, mechanical agitation is used for mixing monomers in their liquid state.

What is emulsion polymerization method?

Emulsion polymerization is a polymerization process with different applications on the industrial and academic scale. It involves application of emulsifier to emulsify hydrophobic polymers through aqueous phase by amphipathic emulsifier, then generation of free radicals with either a water or oil soluble initiators.

What is the difference between bulk and solution polymerization?

Solution polymerization occur in existence of inert solvent and suitable catalyst, on the contrary of bulk polymerization which doesn’t need any additives just monomer and a suitable initiator, which has two types batch and continuous bulk polymerization.

What is the difference between suspension and emulsion?

An emulsion is similar to a suspension only in that it is a mixture of two components. Unlike a suspension, which can consist of two components of any phase, an emulsion is a mixture of two liquids.

What are the polymerization techniques?

What is emulsion polymerization technique?

Why is solution polymerization disadvantageous over suspension polymerization?

The advantage of solution polymerization over bulk polymerization is better heat control; the disadvantage solution polymerization is the removal of the diluent from the polymer. This requires a distillation, and that costs an appreciable amount of money.

How is the polymerization rate in emulsion polymerization dependent on the rate of radical generation?

How is the polymerization rate in emulsion polymerization dependent on the rate of radical generation? Explanation: The polymerization rate per cubic centimeters of aqueous phase is given by- Rp= kp (N/2)[M] Thus the rate Rp is independent of rate of radical generation, Ri. 7.

What are the advantages of emulsion polymerization over bulk polymerization?

The products obtained in latex form are directly usable. With emulsion polymerization, we can achieve a high molecular weight product very quickly–within 1-2 hours. Disadvantages include the fact emulsion polymerization yields a less pure end-product than the slower bulk polymerization.

What is the kinetics of suspension polymerization?

The kinetics of suspension polymerization is similar to that of bulk or solution polymerization. The equations derived for polymerization rate and polymer molecular weight in bulk/solution apply to suspension with the lower reactor volume efficiency.

How do you change the molecular weight distribution of a polymer?

Molecular weight distribution can be easily changed with the use of a chain transfer agent. Heat transfer and mixing become difficult as the viscosity of reaction mass increases. The problem of heat transfer is compounded by the highly exothermic nature of free radical addition polymerization.

What is the solvent used in polymerization?

The liquid solvent used in the solution polymerization procedure usually remains a solvent for the resulting polymer or copolymer. This process is only suitable for the creation of wet polymer types, as the removal of excess solvent is difficult.