Download or read book Correlation Between Morphology and Optical Properties of Blends of Small Organic Molecules and Thermoplastic Polymers written by Kittiyaporn Singsumphan and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterization of Polymer Blends written by Sabu Thomas and published by John Wiley & Sons. This book was released on 2015-02-09 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filling the gap for a reference dedicated to the characterization of polymer blends and their micro and nano morphologies, this book provides comprehensive, systematic coverage in a one-stop, two-volume resource for all those working in the field. Leading researchers from industry and academia, as well as from government and private research institutions around the world summarize recent technical advances in chapters devoted to their individual contributions. In so doing, they examine a wide range of modern characterization techniques, from microscopy and spectroscopy to diffraction, thermal analysis, rheology, mechanical measurements and chromatography. These methods are compared with each other to assist in determining the best solution for both fundamental and applied problems, paying attention to the characterization of nanoscale miscibility and interfaces, both in blends involving copolymers and in immiscible blends. The thermodynamics, miscibility, phase separation, morphology and interfaces in polymer blends are also discussed in light of new insights involving the nanoscopic scale. Finally, the authors detail the processing-morphology-property relationships of polymer blends, as well as the influence of processing on the generation of micro and nano morphologies, and the dependence of these morphologies on the properties of blends. Hot topics such as compatibilization through nanoparticles, miscibility of new biopolymers and nanoscale investigations of interfaces in blends are also addressed. With its application-oriented approach, handpicked selection of topics and expert contributors, this is an outstanding survey for anyone involved in the field of polymer blends for advanced technologies.
Download or read book The Morphology and Optical Properties of Organic Molecules and Heterostructures written by Manal Alkhamisi and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Understanding the Correlation Between Microscopic Morphology and Photophysical Properties of Conjugated Polymers by Optical Spectroscopy written by Liwei Wang (Chemist) and published by . This book was released on 2021 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The unique photophysical and electronic properties of conjugated polymers (CPs) make them promising candidates for applications in displays, biosensors, field-effect transistors and photovoltaic devices. The photophysical properties of CPs are strongly dependent on the chain morphology. However, the understanding of the morphology-property correlation is still obscured both due to inhomogeneities in ensemble experiments and even due to multichromophoric properties in single chain experiments. In this dissertation, we constructed a single molecule spectroscopy apparatus and home-built MATLAB code together to correlate simultaneous measurements of intensity, lifetime and spectrum to learn more about proper photophysical models to describe the properties of CPs, the effect of O2, and the role of energy transfer in CPs. Bulk experiments in mixed solvents where chain conformations can be varied were also conducted to understand the CPs from a macroscopic perspective, where chain-chain interactions also play an important role. Especially, we selected three CPs to study, Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), Poly(9,9-dioctylfluorene-alt-bithiophene) (F8T2) and Poly(9,9-dioctylfluorene-alt-biselenophene) (F8Se2). In Chapter 3, data from mixed solvent experiments are known to produce biomodal distributions of spectra where chains emitting red light are thought to be in regions where chromophore aggregation is important. We showed in single molecule experiments that MEH-PPV follows the J-aggregate model where the properties of the chromophore are closely related to the conjugation length. Despite the similarity of the single molecule spectra to those observed in the bulk, fluorescence dynamics and intensities of red emitters are similar to those of blue emitters in the single molecule case. O2 mainly causes reversible quenching ("blinking") on the single MEH-PPV chains. Unfortunately, we could not reproduce flaring observed in a previous thesis and, although we had improved N2 protection and better signal to noise (S/N) ratio, we are not sure why our results are different. In Chapter 4 where we study F8T2, we also observe two distinct types of chromophores in the bulk experiments depending on the solvent quality. The photophysical properties of the F8T2 chains were well explained by the Spano HJ model. Even though spectral lineshapes of single F8T2 chains resemble those observed in the bulk, we concluded on the basis of very different emission intensity and lifetime behavior that the origin of the emission spectra is different and could be ascribed to bent chains. We argue that the propensity to bend in the F8T2 case and what makes it different than MEH-PPV derives from the presence of five-membered rings in F8T2 and we note behavioral similarities to polythiophenes that share this property. In Chapter 5, we showed that analogous CPs F8Se2 with selenium instead of sulfur in the monomer units exhibit strongly reduced fluorescence and dramatic reduction in singlet lifetime in the bulk due to heavy atom induced intersystem crossing to the triplet. Surprisingly, however, we observe substantial fluorescence and relatively strong emission in the single chain case for F8Se2. On the basis of a red shift in the spectrum and the long lifetimes relative to the bulk, we believe that the emission we are observing in this case is primarily from a photooxidized species similar to that observed in fluorene polymers. Overall, this work is a step towards looking more carefully at the complex correlation between morphology and photophysical properties. We show that bending of single chains can mimic the spectroscopy of aggregation and that it is necessary to consider fluorescence lifetime and efficiency data to distinguish between these effects. We have also used single chain spectroscopy to look at how chain morphology plays a significant role in energy transfer. In particular, we see little evidence for energy transfer in chains deposited from good solvents in contrast to some work where chains can behave as single chromophores when deposited under conditions where chains are able to collapse. We have also introduced a new way of looking at the relative propensity of different chains within a sample to blink and/or permanently photooxidize through studies correlating intensity drops and rises with spectra"--Pages x-xii.
Download or read book Polymer Blends Handbook written by L. A. Utracki and published by . This book was released on 2014-01-31 with total page 1800 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by an international group of highly respected contributors, this fundamental reference work covers all aspects of polymer blends: science, engineering, technology and applications.
Download or read book Characterization and Analysis of Polymers written by Wiley and published by John Wiley & Sons. This book was released on 2008-02-08 with total page 987 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on Wiley's renowned Encyclopedia of Polymer Science and Technology, this book provides coverage of key methods of characterization of the physical and chemical properties of polymers, including atomic force microscopy, chromatographic methods, laser light scattering, nuclear magnetic resonance, and thermal analysis, among others. Written by prominent scholars from around the world, this reference presents over twenty-five self -contained articles on the most used analytical techniques currently practiced in polymer science.
Download or read book Polymer Morphology written by Hongshun Yang and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers, natural or synthetic, have been widely applied in various areas. This new book is dedicated to related research on calculating, preparing polymers and characterizing the morphology of them, involving polymers from inorganic to organic materials including natural macromolecules. It contains a considerable amount of information on the techniques and methods used for the characterization and analysis of polymer morphology. Various techniques covered include but not limited to electron microscopy and atomic force microscopy.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2003 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymers written by Bryan Ellis and published by CRC Press. This book was released on 2008-10-29 with total page 1129 pages. Available in PDF, EPUB and Kindle. Book excerpt: A reliable source for scientific and commercial information on over 1,000 polymers, this revised and updated edition features 25 percent new material, including 50 entirely new entries that reflect advances in such areas as conducting polymers, hydrogels, nano-polymers, and biomaterials. The second edition also comes with unlimited access to a complete, fully searchable web version of the reference. Powerful retrieval software allows users to customize their searches and refine results. Each entry includes trade names, properties, manufacturing processes, commercial applications, supplier details, references, and links to constituent monomers.
Download or read book Engineered Materials Abstracts written by and published by . This book was released on 1994-10 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Morphology written by Qipeng Guo and published by John Wiley & Sons. This book was released on 2016-05-16 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: With a focus on structure-property relationships, this book describes how polymer morphology affects properties and how scientists can modify them. The book covers structure development, theory, simulation, and processing; and discusses a broad range of techniques and methods. • Provides an up-to-date, comprehensive introduction to the principles and practices of polymer morphology • Illustrates major structure types, such as semicrystalline morphology, surface-induced polymer crystallization, phase separation, self-assembly, deformation, and surface topography • Covers a variety of polymers, such as homopolymers, block copolymers, polymer thin films, polymer blends, and polymer nanocomposites • Discusses a broad range of advanced and novel techniques and methods, like x-ray diffraction, thermal analysis, and electron microscopy and their applications in the morphology of polymer materials
Download or read book Lignin Chemistry and Applications written by Jin Huang and published by Elsevier. This book was released on 2019-02-07 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lignin Chemistry and Application systematically discusses the structure, physical and chemical modification of lignin, along with its application in the field of chemicals and materials. It presents the history of lignin chemistry and lignin-modified materials, describes recent progresses, applications and studies, and prospects the development direction of high value applications of lignin in the field of material science. In addition to covering the basic theories and technologies relating to the research and application of lignin in polymer chemistry and materials science, the book also summarizes the latest applications in rubber, engineering plastics, adhesives, films and hydrogels. Systematically discusses the structure, physical and chemical modification of lignin and its application in materials Presents the latest research results in the field of lignin Indicates the development direction of high value applications of lignin in a range of fields, including petrochemicals, household applications, medicine, agriculture, and more
Download or read book Polyolefin Compounds and Materials written by Mariam Al-Ali AlMa'adeed and published by Springer. This book was released on 2015-12-23 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes industrial applications of polyolefins from the researchers' perspective. Polyolefins constitute today arguably the most important class of polymers and polymeric materials for widespread industrial applications. This book summarizes the present state of the art. Starting from fundamental aspects, such as the polymerization techniques to synthesize polyolefins, the book introduces the topic. Basic knowledge about polyolefin composites and blends is explained, before applications aspects in different industry sectors are discussed. The spectrum comprises a wide range of applications and industry sectors, such as the packaging and food industry, the textile industry, automotive and buildings, and even biomedical applications. Topics, which are addressed in the various chapters, comprise synthesis and processing of the materials; their classification; mechanical, physical and technical requirements and properties; their characterization; and many more. In the end of the book, even the disposal, degradation and recycling of polyolefins are addressed, and light is shed on their commercial significance and economic value. In this way, the book follows the entire 'lifetime' of polyolefin compounds and materials: from their synthesis and processing, over applications, to the recycling and reuse of disposed or degraded polyolefin substrates.
Download or read book Current Topics in Elastomers Research written by Anil K. Bhowmick and published by CRC Press. This book was released on 2008-05-07 with total page 1184 pages. Available in PDF, EPUB and Kindle. Book excerpt: From weather-proof tires and artificial hearts to the o-rings and valve seals that enable successful space exploration, rubber is an indispensable component of modern civilization. Stiff competition and stringent application requirements foster continuous challenges requiring manufacturers to fund ever-expanding research projects. However, this vas
Download or read book The Engineering Index Annual written by and published by . This book was released on 1992 with total page 2264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.
Download or read book Fundamentals Properties and Applications of Polymer Nanocomposites written by Joseph H. Koo and published by Cambridge University Press. This book was released on 2016-10-31 with total page 719 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is focused primarily on polymer nanocomposites, based on the author's research experience as well as open literature. The environmental health and safety aspects of nanomaterials and polymer nanocomposites, risk assessment and safety standards, and fire toxicity of polymer nanocomposites, are studied. In the final chapter, a brief overview of opportunities, trends, and challenges of polymer nanocomposites are included. Throughout the book, the theme is developed that polymer nanocomposites are a whole family of polymeric materials whose properties are capable of being tailored to meet specific applications. This volume serves as a general introduction to students and researchers just entering the field and to scholars from other subfields seeking information.
