thermogravimeteric analyzer measures weight loss upon heating, cooling, or when held at a constant...
TRANSCRIPT
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RET 2008 – Week 2
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…….
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Making Slime
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Making Nylon
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TGA
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Thermogravimeteric Analyzer
• Measures weight loss upon heating, cooling, or when held at a constant temperature.
• The machine is basically a furnace with a microbalancer that is used to characterize materials with regard to their composition.
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Procedure1. Cut out piece of
polymer with hole punch and put in aluminum crucible.
2. Place in platinum microbalancer.
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Procedure (Continued)3. Set the computer for rate of heating (10⁰/min).4. Set computer for type of gas (air for nylon 6,6 and nitrogen for PETE and PP)
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Thermal events and processes that can be determined by TGA
• Absorption/desorption of gases/moisture.
• Thermal stability.• Identification of
decomposition products, solvents, solvates.
• Pseudopolymorphism.
• VOCABULARY• Solvate- an aggregate
that consists of a solute ion or molecule with one or more solvent molecules.
• Pseudopolymorphism-different crystal types are the result of hydration or solvation.
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TGA degradation for two differentHDPE bottles due to filler material.
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Decomposition kinetics- changes in maximum temperature of decomposition due to changes in heating rate.
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DSC
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DSC - Differential Scanning Calorimeter
measures temperatures and heat flows associated with thermal transitions in a material
Glass Transition Temperature - Tg
the temperature at which a solid, such as glass or a polymer,becomes brittle (crystalline) on cooling, or soft (amorphous) on heating
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Punching
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Filling Pan
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Crimping
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Cooling
Heating
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Cooling
Heating
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NMR
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Demo with Tony
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Glass Blowing with Ron Kemp
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AcknowledgmentsAnthony CondoIvan Keresztes
Ron KempNevjinder Singhota
Kevin DilleyJane Earle
Cornell Center for Materials ResearchNational Science Foundation
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