Which polymerization is always alive?

Living ring-opening metathesis polymerization Given the right reaction conditions ring-opening metathesis polymerization (ROMP) can be rendered living. The first such systems were described by Robert H.

What are two types of polymers?

Polymers are of two types: naturally occurring and synthetic or man made.

What exactly is a polymer?

Polymers are large molecules made up of long chains or networks of smaller molecules called monomers. Natural polymers include silk, hair, proteins and DNA, while synthetic (man-made) polymers include polyethylene, polypropylene and polyester.

Why anionic polymers are called living polymers?

Thus, since the propagating chain end maintains its reactivity and is still “living,” the resulting polymer and the polymerization system are called as “living polymer” and “living polymerization,” respectively.

What is the difference between Atrp and RAFT?

The main difference of RAFT with ATRP is that RAFT is based on the transfer of activity between polymer chains bearing dithioester moieties and not on the reversible deactivation of growing polymer chains. Mostly dithiocarbonyl derivatives are used as chain transfer agents.

Why are plastic called polymers?

Plastics are considered polymers because, like polymers, plastics are high molecular weight compounds containing several repeating units. These repeating units are the basic molecules called monomers. Polythene contains more than 50000 monomers linked together to form a long chain.

What are the 4 categories of polymers?

They can be classified into four main categories: thermoplastics, thermosets, elastomers, and synthetic fibers. They are commonly found in a variety of consumer products. Various main chains and side chains are used to make different synthetic organic polymers.

What is another name for a polymer?

Hypernym for Polymer: polyurethane, polyamide, silicone, synthetic resin, lignin, trimer, rna, polymeric amide, dna, copolymer, silicone polymer, ribonucleic acid, polyurethan, deoxyribonucleic acid, Desoxyribonucleic Acid.

What does it mean when a polymer is dead?

A dead polymer means a polymer which is left with no active centers left to polymerize.They are not capable of further growth even after new monomers are introduced. What is the difference between polymer science, polymer chemistry, and polymer physics?

What is the molecular weight of a polymer?

The molecular weight of a polymer is a way of describing how long the polymer chains are Each monomer has a molecular weight (often called the formula weight) Adding the monomers together to make polymers increases the molecular weight The longer the chains, the higher the molecular weight.

How do you describe the length of the polymer chain?

Samples of synthetic polymers alwayscontain polymer chains with a range of chain lengths One way to describe the length of the polymer chains is in terms of an average molecular weight, i.e the average of all the chain lengths in the sample HOWEVER….

What is an example of a copolymer?

Many commercially important polymers are copolymers. Examples include polyethylene-vinyl acetate (PEVA), nitrile rubber, and acrylonitrile butadiene styrene (ABS). The process in which a copolymer is formed from multiple species of monomers is known as copolymerization.