Cross-linking of rubber and polyolefins with organic peroxides
Chemical cross-linking agents such as sulfur or organic peroxides can, under suitable conditions, link polymer chains to form a three-dimensional network. The crosslinking reaction changes many material properties of the polymer. The crosslinked polymers often show properties that are superior to the corresponding properties of the sulfur-vulcanized ones.
Advantages of peroxidic crosslinking of elastomers compared to vulcanization with sulfur:
There are the following disadvantages compared to vulcanization with sulfur:
Peroxidic crosslinking is possible with:
NR natural rubber
IR polyisoprene rubber
BR polybutadiene rubber
CR polychloroprene rubber
SBR styrene-butadiene rubber
NBR butadiene-acrylonitrile rubber
HNBR Hydrogenated Butadiene Acrylonitrile Rubber
Q silicone rubber
AO / EO polyurethane rubber
EPM ethylene-propylene copolymer
EPDM ethylene-propylene terpolymer
POE polyolefin elastomer
T polysulphite rubber
PE polyethylene
CM chlorinated polyethylene
CSM chlorosulphonyl polyethylene
EVA ethylene-vinyl acetate copolymer
ABS acrylonitrile-butadiene-styrene copolymer
EBA ethylene-butyl acrylate copolymer
FPM fluoro rubber
Peroxidic crosslinking is possible with mixtures of:
NBR / EPDM
SBR / EPDM
PE / EPDM
PE / EVA
NBR / EVA
EPDM / PP
POE / EP (D) M
Peroxidic crosslinking only limited or not possible with
ACM polyacrylate rubber
IIR butyl rubber
CIIR chlorobutyl rubber
CO epichlorohydrin rubber
ECO epichlorohydrin copolymer
PP polypropylene
PB polybutene-1
PIB polyisobutene
PVC polyvinyl chloride