L1 /
11
CH1012
COPOLYMERS
• Crosslinking is a way of introducing stiffness into a polymer by bonding chains
together. In the case of natural rubber the
process is called
Vulcanization (sulfur, D )
(C. Goodyear, 1839)
- changes soft, reactive
cis-polyisoprene into
5% cross-linked flexible,
resilient, stable rubber.
together. In the case of natural rubber the
process is called
Vulcanization (sulfur, D )
(C. Goodyear, 1839)
- changes soft, reactive
cis-polyisoprene into
5% cross-linked flexible,
resilient, stable rubber.
• Plasticizers are low MW
cmpds added to a polymer to soften it
eg. PVC = pipes PVC +plasticizer = gumboots
cmpds added to a polymer to soften it
eg. PVC = pipes PVC +plasticizer = gumboots
• Copolymers are
polymers that are formed
from 2 different monomers. eg. Nylon 66
(adipic acid + hexamethylenediamine+
from 2 different monomers. eg. Nylon 66
(adipic acid + hexamethylenediamine+
Phthlalate esters
DEHP
(DiEthylHexylPhthalate)
