What reacts with polyether phenolic resin to give polyurethane structure?(a) Diphenyl methane diisocynate(b) Triphenyl ethane diisocynate(c) Diphenyl ethane diisocynate(d) Triphenyl methane diisocynateI had been asked this question by my school principal while I was bunking the class.The above asked question is from Gas-Vapour Cured Resin Binders in section Binder Technology of Casting-Forming-Welding II

What reacts with polyether phenolic resin to give polyurethane structu

1.	What reacts with polyether phenolic resin to give polyurethane structure?(a) Diphenyl methane diisocynate(b) Triphenyl ethane diisocynate(c) Diphenyl ethane diisocynate(d) Triphenyl methane diisocynateI had been asked this question by my school principal while I was bunking the class.The above asked question is from Gas-Vapour Cured Resin Binders in section Binder Technology of Casting-Forming-Welding II
Answer» The CORRECT answer is (a) Diphenyl METHANE diisocynate To EXPLAIN I would say: In amine CURED PHENOLIC urethane, a tertiary vaporized amine is used to catalyze the reaction between polyether phenolic resin and Diphenyl methane diisocynate to give out polyurethane structure.

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