Unsaturated Polyester and Vinyl Ester Resins

Unsaturated Polyester Resin for Specialty Applications

“…Unsaturated polyester resin was prepared in the present work by the technique reported by B.Parkyn [171]. A mixture of 1.25mol Propylene glycol (PG), 0.5mol Phthalic anhydride, 0.2% p-Toluene sulfonic acid (PTSA) and Xylene as distillating solvent was charged in a three-neck reaction kettle equipped with stirrer, thermometer, nitrogen-gas introducing tube, Dean & Stark apparatus, and water condenser.…”

“…Unsaturated polyester resins are one of the most important matrix resins for commodity glass fibre reinforced composites [171]. They are obtained in a two step process; first unsaturated and saturated acids or anhydrides are reacted with diols in a polycondensation reaction, secondly the resulting linear polyester prepolymer is dissolved in styrene into syrup-like resin [172][173].…”

Influence of tribological test on the global conversion of natural composites

“…These vibrations can be overlapped. Characteristic vibration of aromatic ring are observed at 1607 and 1508 cm -1 [34] . Table 2 summarizes the main vibrations of the uncured vinyl ester resin dissolved in styrene.…”

“…On the other hand, the curing and poscuring evolution of vinyl ester resins have been studied using different types of techniques such as thermal analysis DSC test, DMA test, FTIR spectroscopy or RAMAN spectroscopy [34] . FTIR spectroscopy and its variations such Attenuated total reflection (ATR) could be an interesting technique of analysis to obtain the curing process and to obtain the initial information about the potential alteration of resin structure due to modifications or alterations of conversion during applications or test.…”

New trends in vinyl ester resins

“…Although acrylate VERs are more susceptible to hydrolysis than methacrylate VERs are, they are preferred in radiation cure inks and coatings because of better reactivity (Launikitis 1982). The use of other unsaturated acids such as crotonic and cinnamic acids has also been reported (Jackson 1980, Zaske 1998). Although considerable work has been done on VERs, a comprehensive review dealing with the state of the art of these resins has not been published.…”