01736nas a2200157   4500008004100000022001400041245010700055210006900162260005700231300001200288490000700300520109800307100002501405700002001430856012801450       2008                        eng d  a0170-083900aCationic polymerization of epoxides using novel xanthenyl phosphonium salts as thermo-latent initiator0 aCationic polymerization of epoxides using novel xanthenyl phosph  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcJUN  a755-7630 v603 a<p>The present article describes the effect of steric and electronic factors on the efficiency of initiators based on novel xanthenyl phosphonium salts for cationic polymerization of epoxide monomers. 2-substituted (I(H), I(Cl), I(Me), and I(OMe)) xanthenyl phosphonium hexafluoroantimonate were synthesized and characterized by NMR ((1)H, (13)C and (31)P) and IR spectroscopy. The order of initiator activity in polymerization of glycidyl phenyl ether (GPE), was found as I(H)&gt; I(Cl)&gt; I(Me)&gt; I(OMe). To understand the effect of steric factor, the polymerization of cyclohexene oxide (CHO) was performed and the order of activity was found as I(Cl)&gt; I(H)&gt; I(Me) &gt; I(OMe). All the initiators were found to be latent at ambient temperature and initiates polymerization on thermal initiation. The order of initiator activity was influenced by electronic and steric factors in the system. The thermal stability of these salts was measured by Thermo gravimetric analysis (TGA). The solubility of the initiators in various organic solvents and epoxy monomers is also discussed.</p>1 aGupta, Mukesh, Kumar1 aSingh, Raj, Pal  uhttps://library.ncl.res.in/content/cationic-polymerization-epoxides-using-novel-xanthenyl-phosphonium-salts-thermo-latent-0