Access over 20 million homework & study documents

search

Synthesis, properties and applications of epoxy resins and polyurethanes.

Subject

Chemistry

Type

Homework

Rating

Showing Page:
1/3

Sign up to view the full document!

lock_open Sign Up

Sign up to view the full document!

lock_open Sign Up

Sign up to view the full document!

lock_open Sign Up

Unformatted Attachment Preview

Synthesis, properties and applications of epoxy resins and polyurethanes.Epoxy resinsSynthesis: Epoxy resins or plastics are typically formed by the reaction of epichlorohydrin andbisphenol A:The reaction actually involves the sodium salt of bisphenol A since polymerization is carriedout in the presence of an equivalent of sodium hydroxide. Reaction temperatures are in the range 5095 C. Side reactions (hydrolysis of epichlorohydrin, reaction of epichlorohydrin with hydroxyl groupsof polymer or impurities) as well as the stoichiometric ratio need to be controlled to produce aprepolymer with two epoxide end groups. Either liquid or solid prepolymers are produced by controlof molecular weight; typical values of n are less than 1 for liquid prepolymers and in the range 2-30for solid prepolymers.A variety of coreactants are used to cure epoxy resins, either through the epoxide ...
Purchase document to see full attachment
User generated content is uploaded by users for the purposes of learning and should be used following Studypool's honor code & terms of service.

Anonymous
Great! 10/10 would recommend using Studypool to help you study.

Studypool
4.7
Trustpilot
4.5
Sitejabber
4.4