What are the fraction in fractional distillation?
What Does increasing the length of polymer chain do?
-Increases the boiling point, more viscosity, dark in colour,
polymers with less than 5 carbon are uaually a gas
stronger intermolecular forces
What is cross linking?
This wher polymers are combined with other polymers in a cross link of covalent bonds to increase strength
Eg. rubber for tires
What is crystallization?
Process of partial alignment of the polymers
chain fold together and form ordered llamellae
higher density of polymers
What is a plasticiser?
-added to polymers to increase strength and flexibility, and durability
-most common plasticiers phthalate esters
space out chains to makes them more flexible and less britle
What is Nanotechnolgy?
10 to the -9
1 billionth of a meter
can cure cancer, used to make vaccines
used to increase strngth without weight
silver particles added to socks to absorb sweat