Quiz 2 Study Guide

Quiz 2 Study Guide - PTFE Quiz 2 Study Guide Heat capacity:...

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PTFE Quiz 2 Study Guide Heat capacity : the amount of heat required to increase the temperature of 1 gram of material by one degree at constant pressure Specific heat : heat capacity divided by molecular weight (J/kg-K) Latent heat : heat absorbed or given off without causing an increase in temperature First order thermal transition : any change brought about by heat, whether it is melting or freezing, or boiling or condensation, which has a change in heat capacity, and a latent heat involved Second order thermal transition : a thermal transition that involves a change in heat capacity, but does not have a latent heat Differential Scanning Calorimeter (DSC) o Measures the difference in thermal input rate while heating two pans in such a way that the temperature of the two pans rises at the exact same rate o Measures Glass transition temperature : the temperature at which a solid-state polymer shows a decrease in heat capacity and the polymer becomes softer Melting temperature : the temperature at which molecules become fluid like and lose three-dimensional order; first-order, endothermic Crystallization temperature : the temperature at which the heat capacity of the polymer shows an increase; molecules within the polymer become mobile and pack together tightly; exothermic Heat capacity Crystalline/amorphous fraction of the polymer o The order in which the temperatures are found in the graph: T g , T c , T m o Crystallization can be seen before or after T m , comes after melting when starting material is crystallized
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How are dynamic and static properties different? o Static Tested on Instron tester Static conditions, no motion o Dynamic Tested on Dynamic Mechanical Analyzer (DMA) Applies temperature and oscillations Measures Storage modulus Loss modulus Damping coefficient (storage modulus/loss modulus) Thermogravimetric Analyzer (TGA) o Measures changes in the weight (mass) of a sample as a function of temperature
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Quiz 2 Study Guide - PTFE Quiz 2 Study Guide Heat capacity:...

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