How do you calculate average molecular weight?

How do you calculate average molecular weight?

To get the number average molecular weight you divide the total weight of the sample by the total number of the molecules.

What is size average molecular weight?

2.4. Weight average molecular weight (Mw) measuring system includes the mass of individual chains, which contributes to the overall molecular weight of the polymer. It is based on the fact that bigger molecules contain more mass than smaller molecules.

How do you find the molecular mass of polyvinyl chloride?

Divide the molecular weight of the polymer by the molecular weight of the monomer unit to calculate the degree of polymerization. 110 = x / 62, where x is the molec. mass and 62 is the mass of it’s monomer.

What is molecular weight of polymer?

A polymer’s molecular weight is the sum of the atomic weights of the individual atoms that comprise a molecule. It indicates the average length of the bulk resin’s polymer chains.

How do you find the molecular weight of a polymer?

Molecular Weight Calculations Number average of molecular weight is measured to determine number of particles. Number average of molecular weight is the total weight of polymer, 2.2. 13, divided by the number of polymer molecules, 2.2.

What is the average molecular weight of air?

As an example, the average molar mass of dry air is 28.97 g/mol.

What is the molecular structure of plastic?

Structure. Most plastics contain organic polymers. The vast majority of these polymers are formed from chains of carbon atoms, with or without the attachment of oxygen, nitrogen or sulfur atoms. These chains comprise many repeating units formed from monomers.

Why do polymers have an average molecular weight?

Unlike simpler pure compounds, most polymers are not composed of identical molecules. The HDPE molecules, for example, are all long carbon chains, but the lengths may vary by thousands of monomer units. Because of this, polymer molecular weights are usually given as averages.

Why different average molecular weight are considered for polymer?

Polymer molecular weight is defined as a distribution rather than a specific number because polymerization occurs in such a way to produce different chain lengths. Weight average molecular weight (MW) and number average molecular weight (MN) are two ways we can characterize the polymer molecular weight.

What is the average molecular weight of PVC?

Molar Mass, Molecular Weight and Elemental Composition Calculator Enter a chemical formula to calculate its molar mass and elemental composition: Molar mass of PVC is 93.92596 ± 0.00090 g/mol

What are the physical properties of PVC?

Physical and mechanical properties: PVC is an atactic polymer and therefore essentially uncrystallized. However, it sometimes happens that, locally, over short chain segments, PVC is syndiotactic and can assume the crystalline phase, but the percent shear fracture never exceeds 10 to 15 %. The density of PVC is 1.38 g/cm3.

What is the k value of PVC?

A measure of the molecular weight of PVC based on measurements of viscosity of a PVC solution. It ranges usually between 35 and 80. Low K-values imply low molecular weight (which is easy to process but has inferior properties) and high K-values imply high molecular weight, (which is difficult to process, but has outstanding properties).

What is the chemical reaction of PVC?

PVC is made using a process called addition polymerization. This reaction opens the double bonds in the vinyl chloride monomer (VCM) allowing neighboring molecules to join together creating long chain molecules. nC2H3Cl = (C2H3Cl)n vinyl chloride monomer = polyvinylchloride