Tg and TM can be measured experientally by plotting (AV/ AD, a characterization

Question

Tg and TM can be measured experientally by plotting (AV/ AD, a characterization 2. technique known transitions is by thermal analysis - observing endotherms or exotherms - through differential thermal analysis (DTA) or diff. scanning calorimetry (DSC). Re-read Allcock's discussion of DSC/DTA Chapter 17 pp. 540 546 approx. (depends on which edition you have). [30 pts] (a) During the transition from the glassy as dilatometry. A more convenient method of determining these state to the rubbery state, a polymer will absorb energy as the temperature passes through Tg. Are bonds of any type being broken during this transition? (b) Which has the higher specific (intrinsic) heat capacity (amount of heat necessary to raise sample's temperature by one degree) - a polymer sample below its Tg or above its Tg? (c) Many polymer samples will experience an exotherm (as determined by differential scanning calorimetry) between points Tg and TM if heated slowly enough. What is occurring?

Explanation / Answer

Tg and TM can be measured experientally by plotting (AV/ AD, a characterization

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