L1 /
7
CH1012
STERIC
STABILISATION
Polymer molecules may adsorb on the surface of
lyophobic colloid particles.
• If the polymer
coat surrounding a particle is dense
enough then significant repulsive interactions
will occur with the polymer coat on a
colliding particle ® Steric Stabilisation
• The rep. interactions prevent
flocculation
eg. natural gums+ink
pigments (Chinese 3000BP)
comb-polymer +
oil-paints
· high
gloss paint - no floc
· matt paint - high floc
