Questions

What is the difference between cationic and free radical polymerization?

What is the difference between cationic and free radical polymerization?

The key difference between free radical and ionic polymerization is that free radical polymerization occurs through radicals that contain an unpaired electron whereas ionic polymerization occurs via ionic species that has no unpaired electrons.

What are the different types of polymerization?

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.

What are three types of polymerization?

There are three types of classification under this category, namely, Natural, Synthetic, and Semi-synthetic Polymers.

  • Natural Polymers:
  • Semi-synthetic Polymers:
  • Synthetic Polymers:
  • Linear Polymers.
  • Branched-chain Polymers.
  • Cross-linked Polymers.
  • Classification Based on Polymerization.
  • Classification Based on Monomers.
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What is free radical addition polymerization?

Free-radical polymerization (FRP) is a method of polymerization, by which a polymer forms by the successive addition of free-radical building blocks. Free radicals can be formed by a number of different mechanisms, usually involving separate initiator molecules.

What is the difference between H * * * * * * * * * * and copolymer?

The main difference between homopolymer and copolymer is that homopolymers are produced by using a single type of monomer, whereas copolymers are formed by using two different types of monomers.

What are the limitations of radical polymerization?

Some disadvantages related to the mechanism of free radical polymerization is the poor control of the molecular weight and the molecular weight distribution, and the difficulty (or even impossibility) of preparing well-defined copolymers or polymers with a predetermined functionality.

Which polymerization is faster?

Free-radical polymerization is the most widely used process for polymer synthesis. It is much less sensitive to the effects of adventitious impurities than ionic chain-growth reactions. Free-radical polymerizations are usually much faster than those in step-growth syntheses, which use different monomers in any case.

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What is the main difference between the two types of polymerization?

Difference Between Addition And Condensation Polymerization

Addition Polymerization Condensation Polymerization
Monomers must have either a double bond or triple bond Monomers must have two similar or different functional groups
Produces no by-products By-products such as ammonia, water and HCl are produced

Which type of polymerization are thermoplastics most commonly formed with?

6.2. Thermoplastics are linear or slightly branched polymers that are formed by addition polymerization process (Hasirci et al., 2011).

What is H * * * * * * * * * * and copolymer give one example of each?

Homopolymers are the polymers derived from the polymerization of only one kind of monomer. For example polythene is homopolymer which is made by only one monomer such as ethene. Copolymers are the polymers obtained by the polymerization of two or more kind of monomers.

What is the difference between heteropolymer and copolymer?

As nouns the difference between copolymer and heteropolymer is that copolymer is (chemistry) a polymer derived from more than one species of monomer while heteropolymer is (chemistry) a polymer derived from two or more different (but often similar) types of monomer.

What is the difference between free radical polymerization and anionic polymerization?

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The initiation of anionic polymerization has typically a much smaller activation energy than the corresponding free-radical polymerization. Free-radical polymerizations require potent initiators (and coinitiators). The rate constant for initiator dissociation is much smaller than that for propagation.

What are the steps in the radical polymerization process?

There are three main steps involved in the radical polymerization process: The initiation step creates a reactive point. It is the point where the polymer chain forms. The second step is the propagation step in which the polymer spends its time in growing the polymer chain. In the termination step, the growth of the polymer chain stops.

What is ionic polymerization?

Ionic polymerization is the process of forming a polymer material using ionic chemical species as initial reactants. This is a subtype of chain-growth polymerization; there are two types of chain-growth polymerization as ionic and radical polymerization.

How does temperature affect anionic polymerization reactions?

Anionic polymerization reactions are rather insensitive to temperature and can be carried out at very low temperatures but are only suitable for monomers with strong electron withdrawing groups. Initiation and propagation are strongly affected by the reaction temperature.