the method of melting point measurement. (for polymers)?

Question

can anyone explain this to me?

Answer 1

A lot of polymers do not have proper melting points; they instead undergo gradual phase transitions at certain temperatures. For this reason, the glass transition temperature is sometimes given as the melting point of a polymer. In general, the melting (or other characteristic) temperature of a substance is found by raising the temperature of the material under controlled circumstances and noting the temperature at which the material's properties change.