Methacrylate cross-link , tendency

Whereas monoallyl derivatives sdeld thermoplastic polymers, allyl esters containing two or more unsaturated groups yield thermosetting resins. Thus, monoallyl esters of unsaturated acids, e.g., allyl acrylate, allyl methacrylate, allyl crotonate, and allyl itaconate, and diallyl esters of dibasic acids, e.g., diallyl oxalate, diallyl phthalate, and diallyl itaconate, yield thermoset resins, which generally combine solvent resistance, toughness, hardness, transparency, and heat resistance. The cross-linking tendency of the allyl esters makes them useful in copolymerization wherein they impart these properties to normally linear polymers. 

Ethylene-glycidyl methacrylate copolymer (E-GMA) Epoxide 3-8 % GMA Moderate high reactivity with carboxyl group of PA Tg and hardness limit achievable toughness cross-linking tendency... 

In investigations carried out in our laboratory some years ago, but as yet unpublished, neither poly (isoamyl methacrylate) or the more commonly encountered poly(n-butyl methacrylate) were found to exhibit a similar tendency to chain break at lower temperatures. Analysis of the data by Charlesbys method indicated that these two polymers still tended to undergo cross-linking almost exclusively even when exposed to visible and near ultraviolet radiation at temperatures as low as 25°-35°C. 

---