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Topic: Dynamic mechanical spectroscopy

	engprop_mechtest
		Dynamic mechanical measurements are done by varying the temperature at constant frequency.
		Dynamic mechanical properties vary as a function of temperature and frequency, which have opposite effects on molecular motion.
		Dynamic mechanical testing and the resultant measurement of hysteretic heat buildup is affected by the prepolymer technology, the polyol backbone type, the curative used and the percent stoichiometry selected.
	www.airproducts.com /Products/Chemicals/PSP/EngineeringProperties/engprop_mechtest.htm?wbc_purpose=basic (317 words)

	Spectroscopy - Wikipedia, the free encyclopedia
		Spectroscopy is the study of spectra, that is, the dependence of physical quantities on frequency.
		Spectroscopy is often used in physical and analytical chemistry for the identification of substances, through the spectrum emitted or absorbed.
		The amplitude of macroscopic vibrations is studied by acoustic spectroscopy and dynamic mechanical spectroscopy.
	en.wikipedia.org /wiki/Spectroscopy (1620 words)

	Dynamic mechanical spectroscopy - Wikipedia, the free encyclopedia
		In the technique of Dynamic Mechanical Spectroscopy a material (usually a slab of polymer) is exposed to a periodical deformation.
		In DMS the modulus is measured as a function of the frequency of the deformation and/or the temperature of the experiment.
		The mechanical excitation does not have to be a single sine wave, in fact more than one frequency response can be measured simultaneously in a process called multiplexing.
	en.wikipedia.org /wiki/Dynamic_mechanical_spectroscopy (273 words)

	Spectroscopy...Astroppo.com
		Spectroscopy is often used in physical and analytical chemistry for the identification of substances, through the spectrum emitted or absorbed.
		Spectroscopy can be classified according to the physical quantity which is measured or calculated or the measurement process.
		The amplitude of a macroscopic vibrations are studied by acoustic spectroscopy, and dynamic mechanical spectroscopy.
	www.astroppo.com /spectroscopy.html (313 words)

	Spectroscopy - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-06)
		The intensity of emitted electromagnetic radiation and the amount of absorbed electromagnetic radiation are studied by electromagnetic spectroscopy.
		The amplitude of macroscopic vibrations is studied by and dynamic mechanical spectroscopy.
		Nuclear Magnetic Resonance spectroscopy NMR spectroscopy analyzes certain atomic nuclei to determine different local environments of hydrogen, carbon, or other atoms in the molecule of an organic compound or other compound.
	www.bexley.us /project/wikipedia/index.php/Spectroscopy (1521 words)

	Encyclopedia: Spectroscopy (Site not responding. Last check: 2007-10-06)
		Force spectroscopy is a dynamic analytical technique that allows the study of the mechanical properties of polymer molecules and/or chemical bonds.
		Atomic spectroscopy is the determination of elemental composition by its electromagnetic or mass spectrum.
		Rotational spectroscopy studies the absorption of electromagnetic radiation (typically in the microwave region of the spectrum) by molecules.
	www.nationmaster.com /encyclopedia/Spectroscopy (3497 words)

	Spectroscopy -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-06)
		Spectroscopy is often used in physical and analytical (The science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions) chemistry for the identification of substances, through the spectrum emitted or absorbed.
		Spectroscopy is also heavily used in (The branch of physics that studies celestial bodies and the universe as a whole) astronomy.
		Spectroscopy of matter in situations where the properties are changing with time is called (Click link for more info and facts about Time-resolved spectroscopy) Time-resolved spectroscopy.
	www.absoluteastronomy.com /encyclopedia/S/Sp/Spectroscopy.htm (1161 words)

	Force spectroscopy -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-06)
		The name "force (The use of spectroscopes to analyze spectra) spectroscopy", although widely used in the scientific community, is somewhat misleading, because there is no true matter-radiation interaction.
		Force spectroscopy measures the behaviour of a molecule under stretching or torsional mechanical ((physics) the influence that produces a change in a physical quantity) force.
		Since mechanical breaking is a kinetic, (A statistical process involving a number of random variables depending on a variable parameter (which is usually time)) stochastic process, the breaking force is not an absolute parameter, but it is a function of both temperature and pulling speed.
	www.absoluteastronomy.com /encyclopedia/F/Fo/Force_spectroscopy.htm (808 words)

	SPECTROSCOPY FACTS AND INFORMATION
		Fluorescence spectroscopy uses higher energy photons to excite a sample, which will then emit lower energy photons.
		Spectroscopy of matter in situations where the properties are changing with time is called Time-resolved_spectroscopy.
		Spectroscopy using an AFM-based analytical technique is called Force_spectroscopy.
	www.witwik.com /spectroscopy (1520 words)

	Spectroscopy Summary
		Spectroscopy is the study of spectra, that is, the dependence of physical quantities on frequency.
		Spectroscopy is often used in physical and analytical chemistry for the identification of substances through the spectrum emitted from them or absorbed in them.
		Thermal infrared spectroscopy measures thermal radiation emitted from materials and surfaces and is used to determine the type of bonds present in a sample as well as their lattice environment.
	www.bookrags.com /Spectroscopy (6000 words)

	Spectroscopy: Definition and Links by Encyclopedian.com - All about Spectroscopy
		The recording and studying of spectrum of energy levels in atoms or molecules in the physical sciences[?] is called spectroscopy.
		Mossbauer spectroscopy - Measures the absorption of gamma-rays by atoms bound in a solid as a function of gamma-ray energy.
		Raman spectroscopy The study of spectra caused by the scattering and change in frequency of light due to the transition between vibrational/rotational energy levels in molecules.
	www.encyclopedian.com /sp/Spectrometry.html (320 words)

	Dynamic mechanical spectroscopy - Definition, explanation
		In the technique of Dynamic Mechanical Spectroscopy a material (usually a slab of polymer) is exposed to a periodical deformation.
		In DMS the modulus is measured as a function of the frequency of the deformation and/or the temperature of the experiment.
		The mechanical excitation does not have to be a single sine wave, in fact more than one frequency response can be measured simultaneously in a process called multiplexing.
	www.calsky.com /lexikon/en/txt/d/dy/dynamic_mechanical_spectroscopy.php (269 words)

	Mechanical loss spectroscopy (Site not responding. Last check: 2007-10-06)
		Dynamic processes in a sample, such as movements of atoms or ions, may lead to a dissipation of mechanical energy when an external force is applied to the sample.
		For mechanical loss measurements on ion conducting glasses we use a Dynamic Mechanical Thermal Analyser operating in an asymmetric three-point bending mode.
		The mechanical loss due to ionic movements becomes maximal, when the hopping rate of the ions is identical to the frequency of the applied force.
	www.uni-muenster.de /Chemie.pc/Roling/mech_loss.html (445 words)

	Characterization of biomaterials under dynamic mechanical solicitations (Site not responding. Last check: 2007-10-06)
		Biomaterials are usually in a solid or gel phase and subjected to complex mechanical stresses, such as in implants for substitution or regeneration of bone or in cardiovascular or dental/maxilofacial areas.
		Dynamic experiments are usually used in such characterisations, including tests while the materials are immersed in simulated physiological solutions and body temperature.
		Complete mechanical spectroscopy studies over a wide range of frequencies may reveal very interesting and strongly original results, that enable to predict the performance of the scaffold but also may inform how the cells respond (in terms of biological behaviour and viscoelastic characteristics) to external mechanical fields on in-vitro 3D conditions.
	www.dep.uminho.pt /3bs/Pages/characterization_of_biomaterials.htm (474 words)

	OhioLINK ETD: Rotter, George
		A combined technique of reaction injection molding (RIM) and Fourier transform infrared spectroscopy (FTIR) is used to observe the simultaneous polymerization and crystallization of \varepsilon-caprolactam to form Nylon-6.
		This study attempts to apply techniques common to spectroscopy to clarify the contribution of various effects to the shape of the glass transition as measured by dynamic mechanical spectroscopy.
		This new method of analysis is then extended to explain the differences observed in the mechanical relaxation spectra of the α and γ crystalline conformations of Nylon-6.
	www.ohiolink.edu /etd/view.cgi?case1054928542 (319 words)

	MRSEC Shared facilities - Spectroscopy Facilities
		Studies of protein folding dynamics in water, 19F site positions in amino acid substituted receptor proteins, variable kinetics with change of counterion in palladium catalyzed polymerizations, polymer-polymer binding in supramolecular structures, and tacticity/regiospecificity of polypropylene from advanced Ziegler-Natta catalysts are several of the ongoing research projects that rely on this instrument.
		The Vibrational Spectroscopy Laboratory houses several modified infrared and Raman spectrometers which are able to accommodate unconventional sample types.
		Housed within the laboratory of T.J. McCarthy, the X-Ray Photoelectron Spectroscopy (XPS) Laboratory is well equipped to meet the challenges that new polymers present.
	www.pse.umass.edu /mrsec/specfac.html (656 words)

	[No title]
		Atomistic calculations with semiempirical potentials (molecular mechanics, molecular modelling) yield important molecular parameters (conformations, lattice parameters, defect energies and -volumes of dis- locations and interfaces) for a quantitative description of molecular structure and superstructure of polymers and oligomeric model systems.
		Mechanical relaxation and rubber elasticity of polymer melts, blends and polymer networks are studied by the analysis of master-curves of the dynamic shear compliance.
		Pels (1995): "Dynamic mechanical spectrosopy of the cornea for measurement of its viscoelastic properties in vitro" German J Opthalmol.
	www.uni-ulm.de /uni/veroeff/fb/93-95/17.html.en (1613 words)

	Technical Program Paper Detail - AIChE
		In this study the relationship between nanocomposite rheology and microstructure was investigated by means of dynamic mechanical spectroscopy, steady-shear rheometry and X-ray diffraction.
		The effect of compatibilizer physical chemistry and clay dispersion on linear and non-linear viscoelasticity was investigated by melt mixing of nanocomposites in which properties of the compatibilizing additives were homologously varied.
		Linear viscoelasticity of the polypropylene containing materials were measured by means of dynamic mechanical spectroscopy at a reference temperature of 180°C in a nitrogen environment (ARES Rheometer, Rheometrics Scientific, NJ).
	www.aiche.org /conferences/techprogram/paperdetail.asp?PaperID=343&DSN=annual99 (883 words)

	Silicate Glasses
		Understanding the mechanisms of ionic conductivity in glassy systems is still a challenging task due to the complexity of disordered materials.
		To gain a comprehensive picture on the dynamic of ions several different techniques should be applied to the same glass.
		Beside mobile ions, which are generally considered as network modifiers, it is a challenge to study the dynamic of the network formers such as silicon and oxygen in silicate glasses.
	www.rsc.org /Publishing/Journals/CP/News/SilicateGlasses.asp (703 words)

	Materials Research Lab - Dynamic Mechanical Analysis (DMA)
		Glassy, viscoelastic, elastic, and liquid polymers can be differentiated by DMA, and some details of polymer structure can be inferred from the results.
		DMA is particularly useful for evaluating viscoelastic polymers that have mechanical properties, which exhibit time, frequency, and/or temperature effect.
		The distance between the arms is adjustable by means of a precision mechanical slide to accommodate a wide range a sample length from less than 1 mm up to 65 mm.
	www.mrl.ucsb.edu /mrl/centralfacilities/polymer/DMA.html (526 words)

	Internal Friction; Mechanical Spectroscopy (Site not responding. Last check: 2007-10-06)
		In 1990 De Batist and Magalas suggested a generalized concept for the description of these phenomena known today as mechanical spectroscopy of materials.
		Mechanical spectroscopy (MS) studies absorption spectra of mechanical energy under the conditions of applied periodic external mechanical field.
		Depending on the nature of the perturbing field F, mechanical spectroscopy analyzes the absorbed or emitted energy for various models of the system involving the perturbation source (F), the physical object (S) subjected to the action of the perturbing field, and the response (R) (see Fig.
	www.csl.mete.metu.edu /intfriction/index.htm (647 words)

	Main
		Our research interests are in the physical chemistry and physics of polymeric systems in order to characterize morphology, conformation and dynamics both to polymers and copolymers in the melt state and in solution.
		In particular our research concerns the dynamics of bulk polymers, polymer blends, controlled release polymers and multicomponent systems utilizing a variety of experimental techniques (Electron Paramagnetic Resonance (both CW and pulsed), Dynamic Light Scattering (Photon correlation spectroscopy and Fabry-Perot interferometry), Dielectric Relaxation and Mechanical Spectroscopy).
		These shifts may be related to dynamic processes involving either the center-of-mass diffusion of the polymer or the rearrangements of smaller portions of the molecule.
	tccc.iesl.forth.gr /AMS_EPEAEK/CV/rizos_cv.html (869 words)

	OhioLINK ETD: Ning, Xin
		It was demonstrated that by design of the molecular architecture of the benzoxazines from different primary amine and biphenol structures, materials with mechanical properties superior to conventional phenolic materials and ease of processing could be obtained.
		The dynamic mechanical properties of the phenolic materials were studied by mechanical spectroscopy.
		The pseudo-gel structures detected by dynamic experiments were probably due to physical interactions and topological frictions among highly branched chains which were intermediates in the formation of crosslinked networks.
	www.ohiolink.edu /etd/view.cgi?case1059490285 (395 words)

	Rensselaer MS&E - Sanford S. Sternstein
		Professor Sternstein's research interests focus on the physical and mechanical properties of polymers and composites, and particularly on viscoelastic behavior, dynamic mechanical spectroscopy, polymer-filler interactions, inhomogeneous swelling theory, thermal conductivity and instrumentation for rheological measurements.
		One study about to appear in the literature involves the behavior of over 25 filled elastomer systems and the modeling of the mechanism that gives rise to nonlinear viscoelastic behavior as manifested by large changes in both dynamic modulus and damping with deformation amplitude.
		Sternstein has also investigated the dynamic behavior of ceramic single fibers and their creep rates at temperatures to 1600 C in custom equipment developed in his laboratory.
	www.rpi.edu /dept/materials/SSS (326 words)

	Spectroscopy - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-10-06)
		For example, UV/Vis absorption spectroscopy is most often performed on liquid samples to detect molecular content and IR spectroscopy is most often performed on dried samples to to determine molecular information, including structureal information.
		NMR spectroscopy determines the different local environments of hydrogen or carbon atoms in an organic
		Infrared Vibration-Rotation Spectroscopy : From Free Radicals to the Infrared Sky
	encyclopedia.worldsearch.com /spectroscopy.htm (788 words)

	Research interests (Site not responding. Last check: 2007-10-06)
		Dynamic processes include hopping motions and diffusion of mobile ions, and molecular dynamics in polymers.
		The aim of our work is to obtain a better understanding of the influence of structure on charge carrier dynamics and molecular dynamics, respectively, and also of the influence of dynamic processes on macroscopic properties of materials.
		Study of the interplay between the charge carrier dynamics and the molecular dynamics in polmyer electrolytes by means of conductivity and mechanical loss spectroscopy (in collaboration with N. Kaskhedikar and Prof.
	www.uni-muenster.de /Chemie.pc/Roling/research.html (295 words)

	MATSE 352: Polymer Characterization Laboratory (Site not responding. Last check: 2007-10-06)
		To teach students to analyze and interpret results of laboratory experiments; to formulate critical evaluations of both positive results (results that were as expected) and negative results (results that were not as expected).
		Be able to predict the influence on mechanical and processing properties of changing the sample's molecular weight and molecular weight distribution.
		Given an open-ended request to perform as a team of 2-3 students a laboratory project of unspecified content during the limited time of the semester and with the resources available to the laboratory, design and execute this project, summarize it in written form, and communicate it orally to the class.
	www.mse.uiuc.edu /info/courses/matse352.html (390 words)

	Molecular Dynamics of Pamam Dendrimers (Site not responding. Last check: 2007-10-06)
		The principal objectives of this study are to conduct a systematic investigation of the fundamental dynamic features of a series of PAMAM dendrimers, explore the unique characteristics of these materials and quantify the effect of molecular (generation, terminal group) and external (temperature) factors on their properties.
		By studying dynamics on the nanoscopic and microscopic level, we learn important information about the physics that underlies processing, structure and properties on the macroscopic level.
		In this study, the dynamics of PAMAM dendrimers was investigated by dielectric relaxation spectroscopy (DRS) and dynamic mechanical spectroscopy (DMS).
	aiche.confex.com /aiche/2005/preliminaryprogram/abstract_26114.htm (384 words)

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