PsychoticSheepI just found this photo of one of the most disgusting preparations of my entire training… PU foam!
First, a highly branched polyester was synthesized from adipic acid, oleic acid, and phthalic anhydride with 1,1,1-tris(hydroxymethyl)propane using PTSA as an acid catalyst. The polycondensation ran for many hours at ~190 °C under nitrogen and vacuum while water was continuously removed as a by-product.
During the reaction, the acid number (determined by titration, mg KOH/g) was monitored until it dropped below 10, with a target around 5. The resulting viscous polyester polyol was then reacted with tolylene-2,4-diisocyanate to produce rigid polyurethane foam.
Chemically interesting.
Visually and olfactorily… slightly traumatic. 🧪😵
#chemistry #organicchemistry #polymerchemistry #polyurethane #polymer #lablife #chemistrylab #chemstudent #polyester #synthesis
First, a highly branched polyester was synthesized from adipic acid, oleic acid, and phthalic anhydride with 1,1,1-tris(hydroxymethyl)propane using PTSA as an acid catalyst. The polycondensation ran for many hours at ~190 °C under nitrogen and vacuum while water was continuously removed as a by-product.
During the reaction, the acid number (determined by titration, mg KOH/g) was monitored until it dropped below 10, with a target around 5. The resulting viscous polyester polyol was then reacted with tolylene-2,4-diisocyanate to produce rigid polyurethane foam.
Chemically interesting.
Visually and olfactorily… slightly traumatic. 🧪😵
#chemistry #organicchemistry #polymerchemistry #polyurethane #polymer #lablife #chemistrylab #chemstudent #polyester #synthesis
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