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How do you increase the density of a polymer?

How do you increase the density of a polymer?

For most polymers density is a constant; polypropylene is 0.90 g/cm3, polycarbonate is 1.2 g/cm3, etc. Adding filler such as talc or glass will increase the density; incorporating an impact modifier may lower it slightly; but the density of the base polymer does not change.

What affects density of polymer?

The more crystalline a polymer, the more regularly aligned its chains. Increasing the degree of crystallinity increases hardness and density.

Is it possible to change the properties of polymers?

Many fundamental properties that can be changed with polymers. Overall, the main ways to change and tune the properties of a polymer include changing the length of the polymer chains, creating branched chains from linear polymer chains, crosslinking the polymer chains and adding plasticizers into the polymer.

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What affects the density of plastic?

It is calculated by dividing the material’s mass by volume and is generally expressed in g/cm3. The density of plastics usually varies with temperature changes. It may also change due to absorption of solvent, loss of plasticizers, and change in crystallinity.

How can you change the density of plastic?

The methods of reducing the density of plastics include foaming modification, adding light filler and blending light resin. Foaming molding is the most effective way to reduce the density of plastic products.

Do polymers have low volume?

Since polymeric molecules are much larger and hence generally have much higher specific volumes than small molecules, the number of molecules involved in a polymeric mixture is far smaller than the number in a small molecule mixture of equal volume.

Does density always increase when molecular weight increases?

yes, high molecular weight means high density and vice versa. polymers with high molecular weight have high density and vice versa.so,the relation is direct.

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How can you increase the thermal stability of a polymer?

It is well known that aromatic structures in the polymer backbone and cross-linking processes improve the thermal stability of polymers. On the other hand, double bonds or oxygen-containing structures in the main chain make polymers less resistant to high temperatures [25].

Do polymers expand or contract when heated?

The extent to which the polymer expands or contracts when heated or cooled. As a result, polymers can expand by differing amounts in different directions.) Crystallinity. The extent to which the polymer chains are arranged in a regular structure instead of a random fashion.

What determines tensile strength of a polymer?

There is tensile strength. A polymer has tensile strength if it is strong when one pulls on it like this: Tensile strength is important for a material that is going to be stretched or under tension. Fibers need good tensile strength.

What is tensile strength of a polymer?

The tensile strength is the stress needed to break a sample45. It is expressed in Pascals or psi (pounds per square inch). The tensile strength is an important property for polymers that are going to be stretched.