What are the advantages of coordination polymerization?

The coordination polymerization of olefins has many advantages over conventional polymerization. For example, it allows for excellent control of the molecular weight (MW), tacticity, and comonomer incorporation and results in narrow MW distribution. Usually, only very small quantities of catalyst is required.

What are the different types of polymerization techniques used in polymer synthesis?

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. This type of polymerization is a three step process involving two chemical entities.

What coordination catalyst is commonly used for polymerization of PP and PE?

Ziegler–Natta catalysts
For example, special Ziegler–Natta catalysts are used in the polymerization process to synthesize isotactic polypropylene (i-PP) and high density polyethylene (HDPE).

How is co polymerization diff from addition polymerization?

The main difference between addition and condensation polymerization is that in addition polymerization the polymers are formed by the addition of monomers with no by-products whereas in condensation polymerization, the polymers are formed due to the condensation more than one different monomers resulting in the …

What is meant by coordination polymerization?

Coordination polymerisation is a form of polymerization that is catalyzed by transition metal salts and complexes.

Which one is disadvantage of bulk polymerization?

Disadvantages: 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 importance of polymerization process?

A basic understanding of polymerization processes is important not only because polymerization affects structure, and hence properties, but also because some processing routes can convert monomers directly to a finished shape. They offer manufacturing industry considerable benefits both in direct and indirect costs.

What are advantages of bulk polymerization?

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 are the advantages of Ziegler-Natta polymerization over free radical polymerization?

Ziegler-Natta catalysis is especially useful, because it can make polymers that can’t be made any other way, such as linear unbranched polyethylene and isotactic polypropylene. Free radical vinyl polymerization can only give branched polyethylene, and propylene won’t polymerize at all by free radical polymerization.

Which catalyst is used in coordination polymerization explain?

HDPE is produced by coordination polymerisation using a catalyst, usually Ziegler-Natta (ZN). This controls the combining of the monomer, polymerisation taking place on the catalyst’s surface.

Why is addition polymerization also known as vinyl polymerization?

Why is vinyl polymerization also known as addition polymerization? Explanation: In addition polymerisation, polymer are formed by simple linking of monomers without the co-generation of other products. Most of the monomers involves in chain polymerization contains (CH2=CH─) group, known as vinyl group. 3.

What is co polymerization explain with example?

Solution 1 The process of forming polymers from two or more different monomeric units is called copolymerization. Multiple units of each monomer are present in a copolymer. The process of forming polymer Buna−S from 1, 3-butadiene and styrene is an example of copolymerization.

What is co-coordination polymerization and why is it important?

Coordination polymerization has a great impact on the physical properties of vinyl polymers such as polyethylene and polypropylene compared to the same polymers prepared by other techniques such as free-radical polymerization. The polymers tend to be linear and not branched and have much higher molar mass.

What is coordination polymerization of olefins?

The coordination polymerization of olefins has many advantages over conventional polymerization. For example, it allows for excellent control of the molecular weight (MW), tacticity, and comonomer incorporation and results in narrow MW distribution.

What is the difference between free radical and co-ordination polymerization?

Coordination Polymerization. Free-radical polymerization of ethylene produces a low-density, branched polymer with side chains of one to five carbon atoms on up to 3\% of the atoms along the polymer chain. Ziegler-Natta catalysts produce a more linear polymer, which is more rigid, with a higher density and a higher tensile strength.

What is the difference between coordination polymerization and chain shuttleling?

In contrast to conventional coordination polymerization, CCTP and chain shuttling processes can be run such that practically every polymer chain is end-capped with a reactive metal–carbon bond. Various researchers have used this as a chemical handle to add polar functionality to the polyolefin.