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Flashcards in C2 Deck (7)
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1

What are the fraction in fractional distillation?

2

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

more flexiblity

stronger intermolecular forces

3

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

added sulphur

4

What is crystallization?

Process of partial alignment of the polymers

chain fold together and form ordered llamellae

higher density of polymers

increased strength

limited flexiblity

-Freezer draws

5

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

6

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

in suncream

7