The surface of hollow glass beads contains a large amou […]
The surface of hollow glass beads contains a large amount of silanol groups, but their activity is low and it is difficult to participate in chemical reactions. The plasma surface treatment can make the silanols on the surface of the glass beads become the active center, and then initiate the polymerization of the monomer on the surface of the beads. Plasma modification achieves effects through three aspects:
(1) Increase the surface roughness of the 4mm glass balls. Use inert gases such as argon and helium to etch the surface of the glass beads to increase the contact area between the glass beads and the resin, and also make the polymer segments of the resin "anchor" in it, increasing the interface compatibility of the composite material .
(2) Activate the surface of glass beads. Use carbon dioxide, nitrogen, ammonia, etc. to activate the surface of the microbeads, and introduce carboxyl, amino, hydroxyl and other groups to react with the molecular chain of the resin and increase the interaction between the glass beads and the resin interface.
(3) Plasma polymerization. First, plasma is used to activate the surface of the hollow glass microbeads, introduce active groups such as free radicals, and then carry out the grafting reaction to form a polymer film with specific groups on the surface of the microbeads.