Photoinitiated crosslinking of the Polimal type unsaturated polyester resins in the presence
of benzoin ethers as photoinitiators
The Polish-made unsaturated polyesters of the Polimal type have been photopolymerized in UV-range with the use of lower alkyl ethers of benzoin as initiators. For the system of Polimal 103 — benzoin isobutyl ether the dependence of the surface hardness, impact strength and softening temperature of the cured samples on photolnitiator concentration has been determined. Using an original measuring system the thermal e ffe cts of the photoinitiated polymerization In the presence of various amounts of initiator have been measured. The course of the photo- and tbermoinitlated by benzoyl peroxide crosslinking of Polimal resins as well as the properties of crossllnked resins from both processes have been compared.
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