# How is silica bead bonded into polystyrene?

What kind of bonds silica bead forms with polystyrene? Silica is now as ~100 $\mu$m spherical particles in bulk polystyrene that is made by melting.

How can I bond the silica particles

1. more tightly

2. more loosely

to the polystyrene?

Can this be generalized to any nano/micro particle and plastics? I am thinking now metal oxides and other thermoplastics.

• The main chemical groups on the surface of silica beads are silanol groups –SiOH. The main control one over their surface chemistry is thus the functionalization of these silanol groups. – F'x May 12 '12 at 21:58
• First, You should define what You mean with "silica beads"! Some kinds of (the dozens of materials called silica) have maybe silanol groups, but most important Polystyrene will not form bonds to them. Why do You think there are bonds? – Georg May 15 '12 at 21:15
• Polymers do hydrogen bonding (van der Waals, etc.) with each other, right? Then silanol groups should bond with these? Lets assume that these particles are basic hardware stuff that is used for sand blasting (vwr part number 201-0481 [EN]GLASS BEADS SILIBEADS S D0,04-0,07MM). I would assume that they are very inert. And the question is, how can I activate or deactivate (functionalize/defunctionalize) these bonds to react with polystyrene? – Juha May 18 '12 at 8:02