What is long-chain branching?

Long-chain branches are defined as those long enough to entangle, i.e., the branch molecular weight is more than two times the entanglement molecular weight (Me) of the polymer (Graessley 1974).

What is LCB in polymer?

Two types of branching are long-chain branching (LCB) and short-chain branching (SCB), wherein the molar mass of the branches is larger or smaller than the entanglement molar mass, respectively. …

What is long chain polymers?

Polymers are materials made of long, repeating chains of molecules. The materials have unique properties, depending on the type of molecules being bonded and how they are bonded. Some polymers bend and stretch, like rubber and polyester. The term polymer is often used to describe plastics, which are synthetic polymers.

What are long chain polymers made by linking of several ester units?

Answer: Polyester, a class of synthetic polymers built up from multiple chemical repeating units linked together by ester (CO-O) groups. Polyesters display a wide array of properties and practical applications.

What is branched chain polymer?

Branched polymers are defined as having secondary polymer chains linked to a primary backbone, resulting in a variety of polymer architectures such as star, H-shaped, pom-pom, and comb-shaped polymers.

What are branched chain polymers?

What is a long chain monomer?

A monomer is a type of molecule that has the ability to chemically bond with other molecules in a long chain; a polymer is a chain of an unspecified number of monomers. Essentially, monomers are the building blocks of polymers, which are more complex type of molecules.

Is a long chain polymer of a chemical substance called?

Explanation: Polyester is a long chain polymer of a chemical substance called 2) ester. “Polyester” is a “synthetic Polymer” and it consists of multiple repeated chemical units are called esters.

What is polyester made of Class 8?

Polyester is manufactured from petroleum. It is a category of polymer which contain an ester group in their main chain. PET (Polyethylene terephthalate), the commonly used polyester, is made from two monomers by condensation polymerization.

Which of the following is branched chain?

nylon – 6,6.

How is branched polymer made?

2.3. The branches result from side reactions during polymerization. Monomers with two or more end groups are likely to support branching. For a polymer to classify as branched polymer the side chains or branches should comprise of a minimum of one complete monomer unit.

What branched means?

1 botany : to put forth secondary shoots or stems : to put forth branches (see branch entry 1 sense 1) : ramify an elm branching out over the rooftop. 2 : to extend in different directions from a main part or point : to spring out (as from a main stem) : diverge where the spring branches off from the river.