Download or read book Fluorescence Studies of Polymer Containing Systems written by Karel Procházka and published by Springer. This book was released on 2016-02-03 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume describes the application of fluorescence spectroscopy in polymer research. The first chapters outline the basic principles of the conformational and dynamic behavior of polymers and review the problems of polymer self-assembly. Subsequent chapters introduce the theoretical principles of advanced fluorescence methods and typical examples of their application in polymer science. The book closes with several reviews of various fluorescence applications for studying specific aspects of polymer-solution behavior. It is a useful resource for polymer scientists and experts in fluorescence spectroscopy alike, facilitating their communication and cooperation.
Download or read book Fluorescence Studies of Polymer Behaviour in Solution written by Linda Swanson and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterization of the Behaviour of Solution responsive Polymers by Fluorescence written by Michael Andrew Theodore Fowler and published by . This book was released on 2014 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two families of amphiphilic polymers were characterized with respect to their ability to respond to changing solution conditions using steady-state and time-resolved fluorescence. Firstly, a series of 5 sequential amphiphilic polypeptides consisting of hydrophilic and ionizable aspartic acid (Asp) and hydrophobic phenylalanine (Phe) in varying sequence (AspxPhey)n were studied. The effect of pH on the collapse and aggregation behaviour of the samples was investigated using light scattering which determined that the samples became insoluble when the fraction of ionized amino acids decreased below 0.2. Pyrene fluorescence measurments demonstrated that hydrophobic aggregate formation was the cause of this behaviour. The fluorescence and light scattering experiments yielded a detailed description of how pH affects the collapse and aggregation behaviour of amphiphilic polypeptides. Secondly, a series of poly(N-isopropylacrylamide) chains in aqueous solution, varying in length and end-labelled with pyrene (Py2-PNIPAM), were studied with respect to their temperature dependent solubility using turbidimetry, light scattering, and fluorescence. The cloud point temperature (Tc) of the Py2-PNIPAM samples was found to increase with increasing chain length. Steady-state fluorescence spectra yielded the ratio of excimer intensity to that of monomer intensity, or (IE/IM)SS, which reached a maximum at Tc. Time-resolved fluorescence decays were analyzed using Model-Free Analysis (MFA). The MFA yielded the average rate constant of excimer formation k, and the parameters fagg, fdiff and ffree, which reflect the molar fractions of pyrenes that form excimer from pre-formed aggregates, form excimer by diffusion, and do not form excimer, respectively. Increasing the temperature above Tc caused a strong decrease in k and ffree, and a sharp rise in fdiff, which is consistent with the formation of mesoglobules. Increasing the temperature above the dehydration temperature of unlabelled PNIPAM (Tm = 34 oC) caused the distribution of pyrene to stabilize. The third study focused on aqueous mixtures of Py2-PNIPAM and unlabelled PNIPAM, and their ability to mix when the temperature was raised above Tm. Using turbidimetry, separate transitions for Py2-PNIPAM and unlabelled PNIPAM were identified. Steady-state fluorescence of the labelled chains demonstrated separate (IE/IM)SS transitions for the labelled and unlabelled chains as well. The MFA of the time-resolved fluorescence decays yielded no transition in k at Tm, while fagg, fdiff and ffree showed transitions consistent with unlabelled PNIPAM entering the Py2-PNIPAM mesoglobules. This led to the conclusion that the two polymers are able to mix at and above Tm, and that the mesoglobules are not frozen and vitreous. Fourthly, a variety of pyrene-labelled polymers in organic solution were studied using steady-state and time-resolved fluorescence, where the results of Birks' Scheme and the Fluorescence Blob Model (FBM) were compared to the results of the MFA. The MFA was found to be able to faithfully reproduce the results of the other, more established, models. In addition, the MFA allowed the calculation of (IE/IM)SPC, the ratio of excimer to monomer intensity as determined by time-resolved fluorescence, which scaled linearly with both (IE/IM)SS and k. From this it was concluded that the MFA is able to fit the decays of pyrene-labelled polymers with any architecture studied thus far, but also provides an absolute measure of IE/IM which can be reproduced in any lab.
Download or read book Photophysical and Photochemical Tools in Polymer Science written by Mitchell A. Winnik and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1980 the New York Academy of Sciences sponsored a three-day conference on luminescence in biological and synthetic macromolecules. After that meeting, Professor Frans DeSchryver and I began to discuss the possibility of organizing a different kind of meeting, with time for both informal and in-depth discussions, to examine certain aspects of the application of fluorescence and phosphorescence spectroscopy to polymers. Our ideas developed through discussions with many others, particularly Professor Lucien Monnerie. By 1983, when we submitted our proposal to NATO for an Advanced Study Institute, the area had grown enormous ly. It is interesting in retrospect to look back on the points which emerged from these discussions as the basis around which the scientific program would be organized and the speakers chosen. We decided early on to focus on applications of these methods to provide information about polymer molecules and polymer systems: The topics would all relate to the conformation and dynamics of macromolecules, or to the morphology of polymer-containing systems. Another important decision was to expand the scope of the ASI to include certain photochemical techniques, parti cular ly laser flash pho to lys is. These appl icat ions were at the time quite new, but full of promise as important sources of information about polymers.
Download or read book Multidimensional Spectroscopy of Polymers written by Marek W. Urban and published by Wiley-VCH. This book was released on 1995-08-31 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focuses on advances in three areas of multidimensional spectroscopy: NMR, vibrational, and fluorescence. Discusses important areas in polymer analysis, including diffusion, free volume, adhesion, absorption, polymer interactions, and miscibility. Includes introductory chapters as well as chapters covering both theory and application. Valuable material for researchers in polymer science and in analytical laboratories specializing in NMR, FT-IR and fluorescence spectroscopy.
Download or read book Fluorescent polymers for sensing and imaging written by Seiichi Uchiyama and published by MDPI. This book was released on 2020-12-29 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays, all scientists recognize that fluorescent probes play important roles in wide research areas, from chemistry to biology. By combining this fact with specific functional benefits from synthetic polymers, fluorescent polymeric probes are occasionally superior to small organic and inorganic fluorescent (or luminescent) probes in terms of sensitivity, robustness, and multiple functionality. The targets of fluorescent polymeric probes have extended from chemical species to physical parameter. This special issue is a platform for researches to develop a novel fluorescent polymeric probe and to establish a new analytical method using a conventional fluorescent polymeric probe. Related researches, e.g., fluorometric investigation of functional polymers, are also included.
Download or read book Polymer Yearbook written by Richard A. Pethrick and published by CRC Press. This book was released on 1991 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains reviews on state-of-the-art Japanese research presented in the annual Spring and Autumn meetings of the Japanese Polymer Science Society. The aim of this section is to make information on the progress of Japanese Polymer Science, and on topics of current interest to polymer scientists in Japan, more easily available worldwide.
Download or read book Luminescence Studies of Polymer Behaviour in the Solution and Solid States written by David M. Lucas and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluorescence Studies of the Dynamics of Water Soluble Polymers in Aqueous Solutions and Dispersions written by Darren Lumber and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Solutions written by Iwao Teraoka and published by John Wiley & Sons. This book was released on 2004-04-07 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer Solutions: An Introduction to Physical Properties offers a fresh, inclusive approach to teaching the fundamentals of physical polymer science. Students, instructors, and professionals in polymer chemistry, analytical chemistry, organic chemistry, engineering, materials, and textiles will find Iwao Teraoka’s text at once accessible and highly detailed in its treatment of the properties of polymers in the solution phase. Teraoka’s purpose in writing Polymer Solutions is twofold: to familiarize the advanced undergraduate and beginning graduate student with basic concepts, theories, models, and experimental techniques for polymer solutions; and to provide a reference for researchers working in the area of polymer solutions as well as those in charge of chromatographic characterization of polymers. The author’s incorporation of recent advances in the instrumentation of size-exclusion chromatography, the method by which polymers are analyzed, renders the text particularly topical. Subjects discussed include: Real, ideal, Gaussian, semirigid, and branched polymer chains Polymer solutions and thermodynamics Static light scattering of a polymer solution Dynamic light scattering and diffusion of polymers Dynamics of dilute and semidilute polymer solutions Study questions at the end of each chapter not only provide students with the opportunity to test their understanding, but also introduce topics relevant to polymer solutions not included in the main text. With over 250 geometrical model diagrams, Polymer Solutions is a necessary reference for students and for scientists pursuing a broader understanding of polymers.
Download or read book Fluorescence of Supermolecules Polymers and Nanosystems written by Mario N. Berberan-Santos and published by Springer Science & Business Media. This book was released on 2007-11-04 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: This, the fourth volume in the Springer series on fluorescence, focuses on the fluorescence of nanosystems, polymers and supermolecules, as well as the development and application of fluorescent probes. Aimed at researchers in organic and physical chemistry and in material sciences, emphasis is placed on the fluorescence of artificial and biological nanosystems; single molecule fluorescence and the luminescence of polymers; and micro- and nanoparticles and nanotubes.
Download or read book Excimer Fluorescence Studies of Multiphase Polymer Systems written by Alan Siu-lun Yeung and published by . This book was released on 1989 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluorescence Spectroscopy of Polymers in Solution written by John M. Torkelson and published by . This book was released on 1983 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluorescence Studies of Polymer Association in Water and Droplet Coalescence in Polymer Blend Melts written by Olga Vorobyova and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first part of this thesis is a study of aqueous solutions of two associative polymers by pyrene fluorescent probe experiments. The polymers we studied are based on a linear monodisperse poly(ethylene oxide) of Mn = 35,000, with C16H33 and C18H37 end groups. The hydrophobic end groups of this polymer associate forming micelle-like structures, which serve as solubilization sites for the pyrene molecules. Fluorescence decay profiles of pyrene were fitted to the Poisson quenching model to obtain the fitting parameter n, the mean number of quenchers per micelle. From the values of n we calculated the end-group aggregation number NR over a range of polymer concentrations, from 0.1 to 17 wt.%. We found that the aggregation number increases with the polymer concentration. The second part of the thesis examines various aspects of latex blend films. The main component (90 wt.%) in the blend is a soft polymer PEHMA [poly(2-ethylhexyl methacrylate)]. The minor component (10 wt.%) is a harder polymer PBMA [poly(butyl methacrylate)], dispersed as 120 nm spheres in the PEHMA matrix. The PBMA particles were labeled with 1 mol.% of covalently bound fluorescent dyes, either phenanthrene or anthracene. We studied shear-induced coalescence in these blends, both 'in line', using a home-built Rheo-Fluo device consisting of a parallel plate rheometer and a fiber-optic assisted fluorescence detection system, and 'off line', using laser scanning confocal fluorescence microscopy. We evaluated the mean size and the width of the particle size distribution of the dispersed phase at various shear rates and found that the size first increases (after 1 hour of shearing) and then decreases (after 10 hours). Comparison with the results obtained under quiescent conditions indicated that shear is highly efficient in promoting coalescence. We also studied the effects of the film preparation conditions on the morphology of the newly formed films and found that in the presence of the surfactant SDS (2 wt.%) the PBMA particles flocculate forming network-like structures. When the surfactant is removed from the dispersion by ion exchange, the blend morphology is uniform. Finally, we evaluated the interface thickness 8 between PBMA and PEHMA using the nonradiative energy transfer method.
Download or read book Solvents and Self Organization of Polymers written by S.E. Webber and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solvents and Self-Organization of Polymers brings together scientists who are experts in macromolecular synthesis, the physical chemistry and the physics of polymer self-organization. The book also contains experimental results and methods, analytical theory and computer simulations. While the work concentrates on problems of basic science, such practical applications as pharmacology are not excluded. The broad cross-fertilization between these areas makes the book a fascinating and masterly survey of the area.
Download or read book Photophysics of Polymers written by Charles E. Hoyle and published by . This book was released on 1987 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides scientists engaged in basic and applied polymer research with a clear understanding of the current status of polymer photophysics. Offers topics ranging from luminescence decay analysis of biologically important polymers to investigation of electronic energy relaxation in the synthesis of aromatic vinyl polymers using picosecond fluorescence spectroscopy. Provides discussions on energy migration in polymer films and solutions, as well as fluorescent conformational probes of polymers in solution, dye labeling techniques, kinetic spectroscopy, excitation migration, triplet antenna effect, and more.
Download or read book CRC Handbook of Thermodynamic Data of Polymer Solutions Three Volume Set written by Christian Wohlfarth and published by CRC Press. This book was released on 2018-10-03 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing valuable insight on physical behavior of polymer solutions, intermolecular interactions, and the molecular nature of mixtures, each volume in this one-of-a-kind handbook brings together reliable, easy-to-use entries, references, tables, examples, and appendices on experimental data from hundreds of primary journal articles, dissertations,
