Slide-Set-3-Chain-Structure-L9

Slide-Set-3-Chain-Structure-L9 - Chain Structure and...

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Unformatted text preview: Chain Structure and Configuration: Configuration: Lecture Slide Set #3 Lecture 9 Dr. Anthony Brennan University of Florida Tel: 352.392.6281 Email: [email protected] EMA 4161C Phys Prop Poly - University of Florida Copyright 2009 EMA 1 Slide Set #3 – Chain Structure and Slide Configuration Configuration • Learning Objectives: – Gaussian Chain concept – Chain dimension terminology • Radius of gaussian chain – End-to-end distance – Radius of gyration – Method Specific Properties • Chemical – XPS, FTIR, WAXD, EDAX, Contact Angle, Chemical Radionucleotide, Derivatization Radionucleotide, • Physical – AFM, SEM, TEM, Ellipsometry, DTMA EMA 4161C Phys Prop Poly - University of Florida Copyright 2009 EMA 2 Chain Dimensions Chain Conformational States Conformational Number of Conformation States is: N = RIS n −1 RIS = Number of Rotational Isomeric States (Gauche+, Trans, Gauche-) n = number of sigma bonds in chain backbone N = 1 x 104770 for PE where Xn ~ 10,000 EMA 4161C Phys Prop Poly - University of Florida Copyright 2009 EMA 3 Chain Dimensions Gaussian Chain • Random Chain Random Conformation Conformation • End-to-End End-to-End Distance <ro> Distance • Radius of Radius Gyration <rg> Gyration EMA 4161C Phys Prop Poly - University of Florida Copyright 2009 EMA 4 Chain Dimensions • Gaussian Chain • End - to - end Gaussian End or random chain: distance and radius or of gyration : – Gaussian of Gaussian distribution of RIS, I.e., trans and gauche states states – characteristic characteristic dimensions based upon molar mass, chain structure and temperature temperature EMA 4161C Phys Prop Poly - University of Florida Copyright 2009 EMA 5 Chain Dimensions Chain n r 2 = mi ri 2 ∑ i =1 n ∑m i =1 s 2 i End to End Distance = r 2 6 Radius of Gyration m - mass of repeat unit (segment) r - vector form center of gravity to atom i EMA 4161C Phys Prop Poly - University of Florida Copyright 2009 EMA 6 Analytical Analysis of Chain Structure Analytical Method Principle Application Spatial Resolution Analytical Sensitivity Nuclear Magnetic Resonance Magnetic dipole response to induced field Configuration, composition, chemical structure ~0.1 nm High X-ray induced emission of electrons structure Chemical of surface 10-150 Å 0.1 Atom % XPS (Xray photon spectroscopy or ESCA) Auger Spectroscopy Focused ion beam induced emission ofStructure Chemical Auger electrons 100 Å of Surface 0.1 Atom % SIMS (Secondary Ion bombardment induced emission of secondary ions 100 Å Chemical sequence, degradation products ppb Ion Mass Spectrometry) FTIR-ATR (Fourier Transform Infrared Spectroscopy – Attenuated Total Reflectance) UV-Vis IR excitation/adsorbance induces vibrational modes Chemical composition, configuration, conformation 10 μm 1 mol % Adsorption/Transmission proportional to dielectric constant Sequence length, conformation, spatial analysis 1Å ppm EMA 4161C Phys Prop Poly - University of Florida Copyright 2009 7 Solid-State C13 NMR - HDPE NMR EMA 4161C Phys Prop Poly - University of Florida Copyright 2009 8 Summary • Chain Chemistry defines structure. • Chain bond rotational potential Chain energies dictate properties energies • Balance of three energies defined by Balance structure/processing structure/processing • Characteristic dimensions defined by Characteristic structure and environment structure EMA 4161C Phys Prop Poly - University of Florida Copyright 2009 EMA 9 References • Introduction to Physical Polymer Science, 4th Edition, Lesley H. Sperling, Wiley Interscience (2006) ISBN 13 978-0-471-70606-9 ISBN • Principles of Polymer Chemistry, P.J. Flory (1953) Principles Cornell University Press, Inc., New York. Cornell • The Physics of Polymers, Gert Strobl (1996) The Springer-Verlag, New York. Springer-Verlag, • Figures were reproduced from Polymer Physics, Figures (1996) Ulf Gedde, Chapman & Hall, New York. (1996) EMA 4161C Phys Prop Poly - University of Florida Copyright 2009 EMA 10 ...
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This note was uploaded on 07/17/2011 for the course EMA 4161c taught by Professor Staf during the Fall '10 term at University of Florida.

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