$1($a$)$ What are the two main mechanisms of polymerisation?

$(2$ marks$)$

b$)$ Describe these two polymerisation mechanisms, giving one example of a polymer produced for each type.

$(8$ marks$)$

c$)$ Give the potential for crystallinity in polymers including:

i$)$ Which type$/$s crystallise.

$(1$ mark$)$

ii$)$ The type of molecular arrangement that can occur.

$(2$ marks$)$

iii$)$ The influence of crystallinity on density, strength, Young's modulus, failure strain and impact energy.

$(5$ marks$)$