Suspension copolymerization of unsaturated resins with styrene and acrylonitrile

Abstract

Investigations are reported on the polymerization kinetics of an unsaturated polyester resin, containing both styrene and acrylonitrile (AN), and on the possibility of making it water‐dilutable in order to use it for impregnating organic fibre materials. It is found that the unsaturated polyester resin, containing 31 wt.‐% styrene, can be diluted with almost no limits with acrylonitrile, but when the quantity of acrylonitrile is up to 14% the products are homogeneous and mono‐phase. After alkalizing with ammonium, the unsaturated polyester resin, containing acrylonitrile, becomes soluble in water in which it forms a fine emulsion. On polymerization of the resin, phase reversal takes place, water remaining dispersely included in the hardened resin. The copolymerization rate as a function of the water quantity is studied.

Novel magnetic composites based on water soluble unsaturated polyester resin and iron oxide nanoparticles

“…The method of preparation is described in references [17,20]. The unsaturated polyester resin is placed in a reactor where is tempered at appropriate initial temperature.…”

“…The obtained emulsion is stable enough with the time in order to undergo various technological processes. It is known the preparation of suspension copolymerization of unsaturated resins with styrene and acrylonytrile using a redox system consisting of metylketohydroperoxide and cobalt naphtenate [17]. The aim of this investigation is the preparation of magnetic nanocomposites on the basis of water soluble unsaturated polyester resin and aqueous solution of magnetic nanoparticles without using of any surfactant.…”

DSC curing study of catalytically synthesized maleic‐acid‐based unsaturated polyesters

“…Several kinetic models have been proposed, which have been empirical6–11 or theoretical 8. 12–13 Curing has been studied extensively in most of the cases by thermo‐analytical methods,6–11, 13–16 or by a combination of thermo‐analytical and other methods 17–21. The curing of unsaturated polyesters includes varyious concentrations of initiator19 or accelerator,15 the use of different accelerators,22, 23 the influence of styrene concentration,18 the use of a vinylic comonomer other than styrene,16 the effect of the molar mass of the pre‐cured resin14 as well as the influence of additives or fillers 20.…”

“…12–13 Curing has been studied extensively in most of the cases by thermo‐analytical methods,6–11, 13–16 or by a combination of thermo‐analytical and other methods 17–21. The curing of unsaturated polyesters includes varyious concentrations of initiator19 or accelerator,15 the use of different accelerators,22, 23 the influence of styrene concentration,18 the use of a vinylic comonomer other than styrene,16 the effect of the molar mass of the pre‐cured resin14 as well as the influence of additives or fillers 20. 24–29 The cis–trans isomerization during polyesterification of maleic acid has been investigated extensively,30–34 as well as the effect of isomerization on the curing reaction,14 but the effect of polyester composition on the isomerization reaction and especially on the curing reaction have not been studied properly.…”