Differential Scanning Calorimetry (DSC)

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DSC: Effect of Hydrogen Bonding on the Tg Polyamide Tg (°C) HBonding Nylon 12,2 59 Least Nylon 10,2 56 Nylon 8,2 93 Nylon 6,2 159 Most DSC: Melting and Crystallization �Terminology �Observations of Melting and Crystallization �Crystallinity Calculations �Applications
DSC: Terminology �Amorphous Phase - The portion of material whose molecules are randomly oriented in space. Liquids and glassy or rubbery solids. Thermosets and some thermoplastics. �Crystalline Phase - The portion of material whose molecules are regularly arranged into well defined structures consisting of repeat units. Very few polymers are 100% crystalline. �Semi-crystalline Polymers - Polymers whose solid phases are partially amorphous and partially crystalline. Most common thermoplastics are semi-crystalline. �Endothermic - A transition which absorbs energy. �Exothermic - A transition which releases energy. �Melting - The endothermic transition upon heating from a crystalline solid to the liquid state. This process is also called fusion. The melt is another term for the polymer liquid phase. �Crystallization - The exothermic transition upon cooling from liquid to crystalline solid. Crystallization is a function of time and temperature. �Cold Crystallization - The exothermic transition upon heating from the amorphous rubbery state to the crystalline state. This only occurs in semi-crystalline polymers that have been quenched (very rapidly cooled from the melt) into a highly amorphous state. �Enthalpy of Melting/Crystallization - The heat energy required for melting or released upon crystallization. This is calculated by integrating the area of the DSC peak on a time basis. Heat Flow (W/g) Observation of Melting 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 236.94°C 45.30J/g 12.73°C 250.61°C Peak Temperature Extrapolated Onset Temperature Area under the curve (Heat of Fusion) Width @ half height
Page 1 and 2: Differential Scanning Calorimetry (
Page 3 and 4: DSC: Definitions A calorimeter meas
Page 5 and 6: DSC: Heat Flow Measurement Alumel w
Page 7 and 8: DSC: Heat Flux Principle The differ
Page 9 and 10: PDSC Pressure DSC (PDSC) : capabili
Page 11 and 12: DSC: Typical DSC Transitions Heat F
Page 13 and 14: DSC: Heating/Cooling Method Heating
Page 15 and 16: DSC: Calibration & Sample Preparati
Page 17 and 18: Heat Flow (W/g) DSC: Temperature Ca
Page 19 and 20: DSC: Traceable Calibration Material
Page 21 and 22: DSC: Effect of Heating Rate on Indi
Page 23 and 24: Heat Flow (W/g) 0.5 0.0 -0.5 -1.0 -
Page 25 and 26: DSC: Baseline Curvature Heat Flow (
Page 27 and 28: Cell Constant DSC: Recommended Purg
Page 29 and 30: DSC: Sample Preparation (cont.) �
Page 31 and 32: DSC: Experimental Conditions �Hea
Page 33 and 34: DSC: Sample Preparation - Hermetic
Page 35 and 36: DSC: Selecting Experimental Conditi
Page 37 and 38: Selecting Experimental Conditions
Page 39 and 40: Heat Flow (W/g) Heat Flow (W/g) DSC
Page 41 and 42: DSC: What is the Glass Transition?
Page 43 and 44: DSC: What Affects the Glass Transit
Page 45 and 46: Effect of Cooling Rate on Tg Heat C
Page 47 and 48: DSC: Effect of Molecular Weight on
Page 49: DSC: Effect of Side Chains on the T
Page 53 and 54: Baseline Types: Linear Heat Flow (W
Page 55 and 56: DSC: PET/ABS Blend "As Received" He
Page 57 and 58: DSC: Effect of Heating Rate on Nylo
Page 59 and 60: ∆T Exothermic DSC: Isothermal Cry
Page 61 and 62: DSC: Effect of Polymer Type on Melt
Page 63 and 64: DSC: Effect of Draw Ratio on Meltin
Page 65 and 66: DSC: Specific Heat Capacity �What
Page 67 and 68: DSC: Specific Heat Capacity Equatio
Page 69 and 70: DSC: Specific Heat Capacity Step 3.
Page 71 and 72: DSC: Effect of Aging on the Specifi
Page 73 and 74: DSC: Modulated DSC TM �Theory �
Page 75 and 76: Heat Flow Heat Flow Kinetic Heat Fl
Page 77 and 78: Distribution of Transitions in MDSC
Page 79 and 80: Temperature (°C) Temperature Chang
Page 81 and 82: Conventional DSC Cp Measurement Cp
Page 83 and 84: Reversing Heat Flow from MDSC Raw S
Page 85 and 86: Glass Transition of Polymer Resin M
Page 87 and 88: MDSC: Detection of Two Glass Transi
Page 89 and 90: MDSC: Heat Capacity vs. Cure Time T
Page 91 and 92: MDSC: Sample Pans Standard Hermetic
Page 93 and 94: MDSC: Heat Flow (Cell Constant) Cal
Page 95 and 96: K(Cp) K(Cp) MDSC: Heat Capacity Cal

Differential Scanning Calorimetry (DSC)

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