How many repeating units are in a trimer

However, the number of atoms in the repeat unit is not always the same as the monomer, if there are chemical byproducts of the polymerization reaction and we would call this a polycondensation polymerization. A good example of this would be nylon 6,6 produced from the polymerization of hexamethylenediamine and adipic acid Figure 1.

Notice that the repeat unit of nylon 6,6 is a combination of both monomers, and that some atoms were lost during the polymerization so that the chemical structure of the repeat unit is not just the simple addition of both monomers; we have lost H 2 O in this reaction. Can you identify the bond formed between the hexamethylenediamine and the adipic acid in the nylon polymer?

Skip to main content. Now since this molecule has ester as its functional group which is biodegradable hence this polymer is biodegradable. Similar to functional groups in biopolymers, these biodegradable polymers contain functional groups.

Hence, Nylon 2-nylon-6 is a biodegradable polymer. So, the correct answer is option B. Note: Buna-S is a synthetic rubber and nylon -6, nylon — 6, 6 is synthetic fibers. A polymer that can be decomposed by bacteria is called a biodegradable polymer.

Some of these useful biodegradable polymers are poly vinyl alcohol PVA and poly caprolactone PCL , which can be blended with a synthetic polymer such as poly vinyl chloride PVC to facilitate their biodegradation in the environment. Complete biodegradation is said to occur when there are no oligomers or monomers left.

The breakdown of these polymers depend on a variety of factors including the polymer and also, the environment the polymer is in. Polymer properties that influence degradation are bond type, solubility, and copolymers among others. Begin typing your search term above and press enter to search. Press ESC to cancel. Skip to content Home Engineering How do you identify repeating units in polymers? Ben Davis November 26, How do you identify repeating units in polymers?

The polymer is formed by enchaining a number of glucose monomers together. At the ends of the polymer chain, there are two hydroxyl end groups. When drawn this way, the etching of the polymer hardly differs from how we would depict the monomer. The world's second-most common, naturally-occurring polymer is lignin. Like cellulose, lignin is found in the cell walls of plants, where it provides strength and structural support. However, lignin is generally associated with woody plants, and it is much stronger, less flexible and more durable than cellulose.

In fact,because of this durability, the removal of lignin from wood pulp poses a significant obstacle during the paper manufacturing process.

Lignin has a more complicated structure than cellulose. It is also formed from monomers, but the structures of those monomers are less regular than in cellulose. Furthermore, they are put together in more complicated ways, rather than all being joined together in an identical fashion.

Like lignin, proteins are also formed from multiple types of monomers. However, these monomers are all enchained in exactly the same way. Proteins have a perfectly repeating "backbone", although the "pendant" groups attached to this backbone vary from one unit to another. In the picture, this backbone is shown in red. We can simplify the drawing by denoting all of the black, variable pendant groups as "R".

As with cellulose, the picture of the polymer, when drawn this way, looks very much like a picture of the monomer. In either case, there is an acid-base equilibrium involving the amine group and carboxylic acid group in the monomer, or what are termed the N-terminus and C-terminus in the polymer.