Photocrosslinking reactions of polyfunctional monomers with vinyl ether or propargyl ether groups

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Abstract
Photocrosslinking reactions of di(2‐vinyloxy)ethyl ether of bisphenol‐A (BPAEVE), dipropargyl ether of bisphenol‐A (BPAPE), and diglycidy ether of bisphenol‐A (BPAGE) were carried out using various cationic photoinitiators in 1,2‐dichloroethane. The reaction of BPAEVE occurred with high conversion to give the gel products, and the reaction rate of BPAEVE was higher than that of BPAGE. While, the photocrosslinking reaction of BPAPE did not take place under the same conditions.Photoinitiated Michael addition reactions of BPAEVE, BPAPE, and other dipropargyl ethers or ester with pentaerythritol (2‐tetramercapto)propionate (PETMP) also proceeded very smoothly to give the gel products by using benzophenone as a photosensitizer in THF. Although the rate of addition reaction of BPAEVE was strongly influenced by the photosensitizer concentration, the addition reaction of BPAEVE with PETMP propagated effectively to give the gel products even without the presence of photosensitizer when irradiated with UV light in THF or toluene solution.

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