Functional Polymers. 4. Polymers of 2,4-Dihydroxy-4'-vinylbenzophenone, New Polymeric Ultraviolet Absorbers

The synthesis of 2,4-dihydroxy-4’-vinylbenzophenone was accomplished in five steps, with an overall yield of 15%, starting with p-ethylbenzoic acid. Pure 2,4-dihydroxy-4’-vinylbenzophenone was polymerized with azobis(isobutyr0)nitrile as initiator; radical copolymerizations with methacrylic acid and styrene were also accomplished. In polymerizations with azobis(isobutyro)nitrile, no interference of the phenol groups of 2,4-dihydroxy-4’-vinylbenzophenone was observed. In copolymerization with styrene using benzoyl peroxide as initiator, the molecular weight of a copolymer containing 3 mol % 2,4-dihydroxy-4’-vinylbenzophenone was found to be significantly higher than that of styrene homopolymer prepared under identical conditions. This effect was also observed in the polymerization of styrene in the presence of a model compound, 2,4-dihydroxy-4’-ethylbenzophenone

Controllo di cottura alimentare in un forno industriale

Nell’articolo viene presentata un’applicazione di visione artificiale utilizzata per il controllo della cottura di biscotti in un forno continuo industriale della Colussi SpA. L’articolo illustra una strategia di controllo che consente di ottenere una migliore qualità del prodotto e una maggiore efficienza del processo di cottura. La retroazione del sistema di controllo è ottenuta mediante un sistema di visione artificiale che determina lo stato di cottura analizzando le caratteristiche di colore dei biscotti