1 Age in years is for student at the start of the academic year-about early September for most schools in the UAE, early April for Indian and Pakistani schools. 2  Check the exact date with the school if your child has a birthday around this time.
The repeating structural unit of most simple polymers not only reflects the monomer(s) from which the polymers are constructed, but also provides a concise means for drawing structures to represent these macromolecules. For polyethylene, arguably the simplest polymer, this is demonstrated by the following equation.
Polymers are large molecules, a type of macromolecule. Their chemical properties are similar to those of simple molecules. For example, if the polymer contains a carbon-carbon double bond, as in poly(but-1,3-diene), it will undergo additions reactions with, say hydrogen or bromine.epending on the reactivities of the monomers, they may form polymers with different arrangements of the monomer units (Figure 2). SBS is an example of a block co-polymer. SBS is so named with S referring to Styrene (phenylethene) and B for Buta-1,3-diene. First, phenylethene is polymerized.