Cationic photopolymerization of p-methylstyrene initiated by phosphonium and arsonium salts

Polymerization of 4-Vinyl-1-Cyclohexene Diepoxide by Rhenium Carbonyls Compounds

“…Isolated polymer was washed with dichloroethane, filtered, dried and weighed. The rate of polymerization was calculated gravimetrically as a function of reaction time [7]. Polymerization of CHO monomer 1 proceeds through the opening of the epoxide ring to give soluble polymer poly (cyclohexene oxide), the product is long sequences of cyclohexane rings interlinked by oxygen atoms, Figure 3, however; the polymerization of the diepoxide monomer 2 was found to proceeds through the opening of both epoxide ring to give crosslinked polymer of poly (4-VCHD), as shown in Figure 4.…”

Arsonium Ylides in Organic Synthesis

“…It was proposed that the origin of the radical initiator is from homolysis of one of the phenyl C-As bonds. Abu-Abdoun and Ali reported the cationic photopolymerization of p-methylstyrene 97 and cyclohexene oxide 98 initiated by the phenacyltriphenylarsonium salt BJ′. The mechanism of this polymerization process was proposed to proceed via dissociation of the excited state 85 (Scheme 69).…”

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“…The reactivity of parasubstituted styrene towards cationic polymerization depends on the type of substituent with the following order; OCH for the cationic polymerization of epoxide and vinyl monomers [6]. Recently, we reported on the use of phenacyltriphenyl phosphonium and arsonium salts as photoinitiators for the cationic polymerization of cyclohexene oxide [7], and styrene [8] and p-methylstyrene [9]. This paper will further examine the photoinitiated polymerization of p-methyl styrene by onium salts [1][2][3] and thermally by cation radical salts [4][5][6] at room temperature, and in dichloromethane.…”