the power of thermodynamics in the characterization of materials zeki y. al-saigh department of...
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![Page 1: The Power of Thermodynamics in the Characterization of Materials Zeki Y. Al-Saigh Department of Chemistry Buffalo State, State University of New York 1300](https://reader035.vdocument.in/reader035/viewer/2022081516/56649d615503460f94a430ba/html5/thumbnails/1.jpg)
The Power of Thermodynamics in the The Power of Thermodynamics in the Characterization of MaterialsCharacterization of Materials
Zeki Y. Al-Saigh
Department of Chemistry
Buffalo State, State University of New York
1300 Elmwood Avenue
Buffalo, N.Y., USA
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OutlineOutline
Background about MaterialsTechniques used in the CharacterizationThe Physics of CharacterizationResults Derived from the Speaker’s
Research: Polymers, Polymer Blends, Conducting Polymers, Biodegradable Polymers.
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Characterization of MaterialsCharacterization of Materials
Obtaining information on the physical and chemical properties of materials, such as:
Mechanical Properties Thermal Properties Interaction Forces Among Molecules Crystallinity Molecular Weight Diffusion of Gases into Layers
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Materials:Materials:
Can be anything which exists in nature:Plastics (polymers), synthetic and naturalRubbersAlloy and CeramicsOil, Coal and carbon fibersPowders and clayFood
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Polymer BlendsPolymer Blends
– A new class of materials is always needed to replace heavy metal alloys.
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Polymer BlendsPolymer Blends
Blending of polymers is a fast and inexpensive route to obtaining a new class of materials
Z.Y.Al-Saigh, International J. of Polymer Analysis and Characterization, 3, 249-291 (1997)
FOR MORE INFO on IGC of polymer blends...
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Polymer BlendsPolymer Blends
Solubility of Polymers is the key term in polymer characterization
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Polymer BlendsPolymer Blends
A pair of polymers may be:Compatible (soluble)Incompatible (insoluble)Partially compatible
Z.Y.Al-Saigh, Trends in Polymer Science, 5, 97 (1997)
FOR MORE INFO on IGC of polymer blends...
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Present Techniques AvailablePresent Techniques AvailableGlass transition temperatureThermal & mechanical NMR Electron spin resonanceSolvent vapor sorptionheat of mixingSmall angle light & X-ray scatteringSmall angle neutron scatteringInverse gas chromatography
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UnfortunatelyUnfortunately
Most of these techniques are beset by a number of technical difficulties
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For ExampleFor Example
Vapor sorption method takes a long time for the establishment of equilibrium between the vapor and the polymer
Neutron scattering uses modified dueterated polymers which are chemically different from the parent polymer
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Gas ChromatographyGas Chromatography
As an alternative method for polymer analysis and characterization
Al-Saigh, Z.Y. and Guillet, J., in “Inverse Gas Chromatography in Analysis of Polymers and Rubbers”, Invited Chapter. Encyclopedia of Analytical Chemistry: Instrumentation and Applications, R. Meyers, Editor, PP. 7759-7792, John Wiley & Sons Ltd, Chichester, (2000).
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Gas Chromatography is:Gas Chromatography is:
A technique by which a mixture of components can be separated, analyzed and quantified.
It works on the principle of interactions of two phases; stationary and mobile.
The stationary phase contains material with active interaction sites, such as sand.
The mobile phase is the vapor of the mixture to be analyzed.
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Inverse Gas ChromatographyInverse Gas Chromatography
The method is called inverse gas chromatography because the stationary phase (polymers or polymer blends) is of interest, unlike the traditional GC method.
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Thermodynamics of IGCThermodynamics of IGC
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Inverse Gas ChromatographyInverse Gas Chromatography
IGC may provide data about: Polymer-solvent interaction
• Homopolymers
• Blends Diffusion Glass Transition
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Current Use of IGCCurrent Use of IGC1. Interaction parameters of polymer-solvent systems
2. Interaction parameters of polymer-polymer systems
3. Solubility parameters and weight fraction coefficients
4. Molar heat, free energy, and entropy of mixing
5. Molar heat, free energy, and entropy of sorption
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6. Degree of crystallinity of semicrystalline polymers7. Diffusion of gases and liquids into the polymer layer8. Glass transition and melting temperatures9. Surface energy of solids10.Detection of melting point depression of a polymer blend as an indicator of miscibility
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BackgroundBackground: Thermodynamics of IGC: Thermodynamics of IGC
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Thermodynamics of IGCThermodynamics of IGC
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Heats of the Mixing ProcessHeats of the Mixing Process
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Thermodynamics of Polymer Blends MiscibilityThermodynamics of Polymer Blends Miscibility
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Blend of semicrystalline diluentBlend of semicrystalline diluent
Are interesting systems for the characterization by inverse gas chromatography
C.T.Chen and Z.Y.Al-Saigh, Macromolecules, 24, 3788 (19910
FOR MORE INFO...
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Blend of semicrystalline diluentBlend of semicrystalline diluent
Two blend systems were studied:
Poly(vinylidene fluoride)-poly(ethyl methacrylate) [PVF2-PEMA]
Poly(vinylidene fluoride)-poly(vinyl methyl ketone) [PVF2-PVMK]
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Blend of semicrystalline diluentBlend of semicrystalline diluent
Above PVF2 m.p., both polymers are at melt
Below PVF2 m.p., two retention mechanisms are expected:
Adsorption of solutes on crystal surfacesAbsorption of solutes by the amorphous
layer
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Blends of semicrystalline diluentBlends of semicrystalline diluent
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Blend of Semicrystalline DiluentBlend of Semicrystalline Diluent
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Conducting Polymers: The unique properties have lead to an interest in the potential use of PANI as a new class of conductors. This interest was generated due to the relative ease of synthesis, low cost, and the stability of PANI in the air. However, the insulating form a PANI, polyaniline emeraldine base (PANI-EB) suffers from the limited solubility in organic solvents.
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Dependence of VDependence of Vgg of Acetates-PANI-EB of Acetates-PANI-EB on Temperature (130 – 170 on Temperature (130 – 170 °°C)C)
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Dependence of VDependence of Vgg of Alkanes-PANI-HEBSA of Alkanes-PANI-HEBSA on Temperature (80 – 130 on Temperature (80 – 130 °°C)C)
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Table III : Interaction Parameters of Alkanes at a Table III : Interaction Parameters of Alkanes at a Temperature Range 140-170Temperature Range 140-170°°C for 7% PANI-EBC for 7% PANI-EB
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Table IV : Interaction Parameters of Alkanes at a Table IV : Interaction Parameters of Alkanes at a Temperature Range 80-130Temperature Range 80-130°°C for 7% PANI-HEBSAC for 7% PANI-HEBSA
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Table V : Molar Heat of Sorption, Table V : Molar Heat of Sorption, ss, ,
of both PANI-EB and PANI-HEBSAof both PANI-EB and PANI-HEBSA
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Surface EnergySurface Energy
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Table VI : Dispersive Surface Energies of PANI-EB and Table VI : Dispersive Surface Energies of PANI-EB and PANI-HEBSA and PANI-HEBSA and CH2CH2
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Surface Energy (mJ/mA2)11.0426.4720041.5040.0028.9020.3033.1061.00-106.00
Surface Energies of PolymersSurface Energies of Polymers
Polymer PEO PVMK Hg PVC PMMA Polypropylene Polyurethane Polyethylene doped PPY
Comparative Data on Surface Energy of Several Polymers
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Inverse Gas Chromatography of PolyanilineInverse Gas Chromatography of Polyaniline
REFERENCES:By Ali Al-Ghamdi & Zeki Y. Al-
Saigh, Journal of Chromatography, A, 969, (2002) 229.
Al-Saigh & Guillet, Encyclopedia of Analytical Chemistry, Volume 9, Page 7759 (2000), Wiley.
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Application of IGC to Biodegradable Polymers------------------------------------------------------------Fibers acid/base interaction potentialWettability test (determination of water
sorption isotherm)Surface adsorption characterizationThermodynamic studieswood-polymer interface studies
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Current ResearchCurrent Research
Characterization of Starch-Based Polymers such as Amylopectin
Amylopectin is known to be mechanically weak.
Blending Amylopectin with another biodegradable polymer may improve the mechanical properties.
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Amylopectin – Alkanes SyatemsAmylopectin – Alkanes Syatems
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Amylopectin – Alcohols SyatemAmylopectin – Alcohols Syatem
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Effect of Temperature on the Interaction Effect of Temperature on the Interaction Parameters, Parameters, χχ1212
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Effect of Number of Carbon on the Effect of Number of Carbon on the Interaction Parameters, Interaction Parameters, χχ1212
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Degree of Crystallinity of AmylopectinDegree of Crystallinity of Amylopectin
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The dispersive Surface Energy, γThe dispersive Surface Energy, γssdd, of , of
AmylopectinAmylopectin
Temperature, oC γCH2, mJ/m2 γs
d, mJ/m2
80 32.16 0.24
100 31.00 0.075
200 25.20 0.028
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Latest Applications of IGCLatest Applications of IGC
Amorphous, co-polymer and blends Semicrystalline polymers and blends Inorganic polymers Amorphous-plasticizer blend Conducting polymers Rubbers Coal and carbon fibers Powders and clay Food