12 Questions
What is the function of water in chemical foaming of polyurethane?
To react with isocyanate group to form carbamic acid
What are the two primary raw materials used to prepare polyurethane?
Isocyanate compounds and polyol
What is the purpose of chain extenders in polyurethane chemistry?
To react with isocyanate group to form a crosslink
What is the repeating unit of polyurethane chemistry?
Polyester-polyol and isocyanurate trimer
What is the result of the reaction between isocyanate group and water in chemical foaming?
Formation of carbon dioxide and amine
What are the two types of foam formation in polyurethane chemistry?
Chemical Foaming and Physical Foaming
Which of the following statements about polyurethane is true?
It can be altered in many different ways through addition polymerization of isocyanates and polyols
What is the typical structure of a polymeric foam material?
A gas phase dispersed in a solid plastic phase
Who pioneered the chemistry of polyurethane?
Otto Bayer
What is the internal phase of a foam?
The dispersed gas phase
What type of materials can be used to form foams?
Natural rubber, synthetic rubber, and other elastomeric materials
What has Mobay Corporation introduced for use in the formulation of different types of polyurethane?
Monomeric and polymeric isocyanates, polyesters, polyether's, melamine and urea derivatives and acrylic polymers
Learn about the chemistry of polyurethane, its raw materials, synthesis, and types including rigid foam and flexible foam. Discover the structure and properties of polyurethane.
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