Thermal Transitions Define melting, what is measured, what classes of polymers e

Question

Thermal Transitions Define melting, what is measured, what classes of polymers exhibit melting Define glass transition, what is measured, what classes of polymers exhibit a glass transition Describe the properties of a polymer above and below the glass transition If given a heat vs. temp curve, label the glass transition temp. and the melt temp Why is there such a large undercooling in polymers? Why is there a difference in the crystal size with different undercooling temperatures How can you lower the undercooling temperature but cause crystallization in reasonable time periods? What does the Lauritzen-Hoffman theory state? Define lamella and spherulite Why don't polymers have well-defined melting points? Why would the melt temp. depend on the temp. used to form a crystal? What factors influence the melt. Temp besides temp to crystallize? Describe what "glassy" means as if you were explaining it to a non-science major. What influences the glass transition of a polymer? What does a plasticizer do to the glass transition and why? What does cross-linking do to the glass transition and why?

Explanation / Answer

2. Glass transition:The Glass Transition Temperature (Tg) is one of the most important properties of any epoxy and is the temperature region where the polymer transitions from a hard, glassy material to a soft, rubbery material. from DSC and TG curve it can be measured. nearly all polymers have glass transition behavior.

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