3. Copolymerization
This section describes the copolymerization mechanism between the double bonds present in the polyester chain and those present in the monomer used to dilute the resin.
3.1 Principle
This copolymerization (also known as cross-linking) leads to the hardening of polyester resins by a radical mechanism analogous to that of vinyl polymerization.
This phenomenon may occur spontaneously during storage, in which case it is slow, irregular and incomplete. To prevent this uncontrolled gelling, stabilizers such as diphenols, quinones or alkali or alkaline-earth salts are added to the polyester solution.
This copolymerization can be controlled and carried out under precise conditions by the use of suitably selected catalyst...
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Copolymerization
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Bibliography
Standards and norms
International Organization for Standardization ISO
- Plastics – Compression molding of thermoset specimens - ISO 295 - 2004
- Plastics – Unsaturated polyester resins. Conventional determination of reactivity at 80°C - ISO 584 - 1998
- Plastics – (polyester resins) and paints and varnishes (binders). Determination of partial acid number and total acid number - ISO 2114 - 2000
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