Table of Contents
How does chain length Affect Polymers?
Modulus of Elasticity – A longer chain length is also associated with a material tends to be tougher and has a higher modulus of elasticity, E, also known as the Young’s modulus. The interaction of the chains causes the polymer to become stiffer.
Do polymers have long chains?
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.
How do you calculate the length of a polymer chain?
To get the chain contour length, divide MW of the polymer by the MW of the monomer unit and multiply by the length of the monomer unit.
How long is a polymer?
Some Common Addition Polymers
Name(s) | Formula | Monomer |
---|---|---|
Polypropylene (PP) different grades | –[CH2-CH(CH3)]n– | propylene CH2=CHCH3 |
Poly(vinyl chloride) (PVC) | –(CH2-CHCl)n– | vinyl chloride CH2=CHCl |
Poly(vinylidene chloride) (Saran A) | –(CH2-CCl2)n– | vinylidene chloride CH2=CCl2 |
Polystyrene (PS) | –[CH2-CH(C6H5)]n– | styrene CH2=CHC6H5 |
Are long chain polymers flexible?
Since many atoms that are part of a polymer’s backbone generally have at least one pendent group, the elements that typically appear in the polymer chain are ones that become stable with four bonds, such as carbon and silicon. Some polymers are flexible. Others are very stiff.
How do you increase the length of a polymer chain?
If you increase the amount of initiator relative to the amount of monomer, you get smaller chains. By adding more monomer, you get larger chains.
Why are polymers bad?
The monomers that are used to make polymers, though, are often toxic or stinky. That means that the companies that make polymers need to be very careful not to let the monomers get out before they’re made into polymers.
What is the chain length?
66 feet
The chain is a unit of length equal to 66 feet (22 yards). It is subdivided into 100 links or 4 rods. There are 10 chains in a furlong, and 80 chains in one statute mile. In metric terms, it is 20.1168 m long.
What is a polymer chain?
A carbon atom bonded to 2 hydrogen atoms can be considered a building block or unit of the polymeric chain. These units make up monomers, which are repeating units in the molecular chain structure. A series of monomers bonded together to form a molecular chain is known as a polymer.
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.
How do polymer chains behave?
The chain behaves as if it were an ideal chain. The quality of solvent depends also on temperature. For a flexible polymer, low temperature may correspond to poor quality and high temperature makes the same solvent good. At a particular temperature called theta (θ) temperature, the solvent behaves as if an ideal chain.