a type of polymer molecule in which groups of atoms are arranged randomly above and below the backbone chain of atoms, when the latter are arranged all in one plane
polypropylene is a soft, rubbery material with no commercial value The isotactic polymer is a rigid substance with an excellent resistance to mechanical stress Explain the difference between the physical properties of these two forms of polypropylene
Polymers in which the side chains are randomly distributed on either side of the polymer backbone
a type of polymer chain configuration where side groups are randomly positioned on one side of the chain or the other