A substance that represents an intermediate stage in polymerization, and can be usefully manipulated before polymerization is completed.
- Siloxanes are prepolymers - the result of partial polymerization of silanes - in which the molecules are beginning to link, but only in sets of two or three, not yet in full chains.
- Some researchers believe that prepolymers achieve better results.
- Artificial clays containing a catalyst can initiate polymerization when the particles are mixed with a prepolymer matrix.
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