synthetic polymers

Question 1

properties of polymers

Answer 1

-high tensile strength
-non-biodegradable
-withstand high temps
-morphed into shapes
-strong

Question 2

LDPE structure

Answer 2

polymer chains that have side branches, stopping polymer molecules from lining up regularly. preventing tight packing

Question 3

LDPE forces

Answer 3

weak intermolecular

Question 4

LDPE formation

Answer 4

200°C, 2000 atm, no catalyst

Question 5

properties of LDPE

Answer 5

• low density
• weak forces of attraction between polymers
• less strong + lower MP than HDPE

Question 6

HDPE structure

Answer 6

no side branches, polymer molecules line up regularly and tightly packed chains

Question 7

HDPE forces

Answer 7

strong intermolecular forces

Question 8

HDPE formation

Answer 8

60°C, very low pressure, titanium chloride catalyst

Question 9

HDPE properties

Answer 9

• higher density, stronger, higher MP, stronger forces of attraction than LDPE

Question 10

thermosoftening structure

Answer 10

tangled long straight polymer chains

Question 11

thermosoftening forces

Answer 11

weak intermolecular, can be broken with heat

Question 12

thermosoftening formation

Answer 12

soften when heated and can be shaped again when hot, harden when cooled

Question 13

thermosoftening properties

Answer 13

can be reshaped when heated up again

Question 14

thermosetting structure

Answer 14

rigid with fixed chains

Question 15

thermosetting bonding and forces

Answer 15

strong intermolecular, polymer chains joined by permanent bonds

Question 16

thermosetting formation

Answer 16

cross-links form when polymer is heated which can’t be broken again so can’t be reshaped once moulded, strong

Question 17

how can different forms of poly(ethene) be produced from ethene?

Answer 17

use different reaction conditions