The Influence Of Film Thickness And Molecular Weight On The Thermal Properties Of Ultrathin Polymer Films
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The Influence Of Film Thickness And Molecular Weight On The Thermal Properties Of Ultrathin Polymer Films
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Author : Lovejeet Singh
language : en
Publisher:
Release Date : 2003
The Influence Of Film Thickness And Molecular Weight On The Thermal Properties Of Ultrathin Polymer Films written by Lovejeet Singh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Polystyrene categories.
Fundamental Understanding Of Physicochemical Properties Of Ultra Thin Polymer Films
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Author : Annapoorani Sundaramoorthi
language : en
Publisher:
Release Date : 2011
Fundamental Understanding Of Physicochemical Properties Of Ultra Thin Polymer Films written by Annapoorani Sundaramoorthi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Microelectronics categories.
Diffusion behavior of spin cast polymer thin films was studied in detail as a function of film thickness. Diffusion coefficients of water molecules in poly(methyl methacrylate) (PMMA) were found to decrease from 10-8 cm2/s in thick films to 10-13 cm2/s in ultra-thin films. In order to probe if there is a characteristic length scale set by the polymer chain size, the effect of PMMA molecular weights on this behavior was tested and deviation of diffusion coefficient from bulk was observed in all molecular weights of PMMA investigated. Diffusion coefficients in these films was also studied as a function of aging time at 25°C and was not found to change significantly over a time period of approximately four months. The impact of residual casting solvent in thick and thin films was studied and found to have no influence in the diffusion behavior. Positron Annihilation Lifetime Spectroscopy (PALs) was used to probe the free volume (FV) pocket size and its distribution within the film as a function of film thickness in PMMA. Decrease in FV pocket size was found to be one of the general underlying causes for such thickness dependent diffusion behavior observed in thin polymer films. In addition, Protracted Colored Noise Dynamics (PCND) that enables efficient sampling of phase space and faster relaxation of the systems compared to Molecular Dynamics (MD) was investigated for its extensibility to three dimensional systems and was found to be sensitive to initial conformation.
Ultrathin Polymer Films
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Author : Mishreyee Bhattacharya
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2013
Ultrathin Polymer Films written by Mishreyee Bhattacharya and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Polymer ultrathin films have become a fascinating multidisciplinary area of research due to its endless applications in our day-to-day life. With reduction of film thickness to a dimension comparable to the chain length, the confinement effect makes polymer films ideal system to investigate novel properties of two dimensional physics. Advent of sophisticated experimental techniques facilitates proper characterization of these films though literature is inadequate focusing thermal properties and glass transition temperature (Tg) in ultrathin polymer films (
27th International Symposium On Microelectronics
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Author :
language : en
Publisher:
Release Date : 1994
27th International Symposium On Microelectronics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Hybrid integrated circuits categories.
Ultra Thin Polymer Films And Hierarchical Composites
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Author : Yujie Liu
language : en
Publisher:
Release Date : 2015
Ultra Thin Polymer Films And Hierarchical Composites written by Yujie Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Properties and fabrications of ultra-thin polymer films and hierarchical composites are of great interest in packaging, electronics, separations, and other manufacturing fields. However, due to the inherently fragile nature of ultra-thin polymer films, measuring their properties has proven difficult. Additionally, variables controlling thin polymer patterns (e.g. substrate wetting property) and composites (weight percent of particulates in matrix) formation have not been fundamentally well understood. Within this spectrum, fundamental understanding of formation mechanisms of these patterns and composites are needed. Additionally, a new characterization technique is required to be able to measure the mechanical properties of fabricated composites and thin films. The pattern (Chapter 2) and composite (Chapter 3) formation presented in this thesis is based upon flexible blade flow-coating, an evaporative self-assembly method. The impact of substrate wetting, varying from being hydrophobic (water advancing contact angle 113°) to hydrophilic (water advancing contact angle 27°), on polymer pattern formation is examined here (Chapter 2). We observe a variety of polystyrene structures including dots, hyper-branched patterns, stripes and lines that can be deposited on substrates with a range of wetting properties. We propose the mechanism for these pattern formations as a balance between Marangoni instability and solute absorption. When adding quantum dot nanoparticles into the polymer (poly(methyl methacrylate) solution in the flow-coating process on hydrophilic substrates, we could obtain free-standing hierarchical nanocomposite films with alternating line and film structures (Chapter 3). The ability to guide assemblies of nanoparticles and polymers in designated areas in one step via flow-coating, provides new understanding of the flow competition of mixing two components which are both on the nanometer scale. Additionally, we introduce a method designated for ultra-thin film tensile testing (Chapter 4). We demonstrate the capability of this method by stretching two-dimensionally macroscopic, yet nanoscopically thin, polymer films on the surface of water. Through laser tracking of the force and displacement on the film, we characterize the full stress-strain response of brittle (polystyrene), ductile (polycarbonate), and rubbery (cross-linked polydimethylsiloxane) polymer thin films. In the brittle (polystyrene) films, we observe a precipitous decrease in mechanical properties (Young's modulus, strain at failure, and nominal stress at failure) for film thicknesses approaching the size of an individual polymer chain (~ 25 nm) yielding insights into polymer chain entanglement theory. To verify our hypothesis in polymer chain entanglement theory for determining failure properties of thin polymer films, we further study the molecular weight effect (853, 490, 137 and 61.8 kg/mol) of polystyrene on failure properties (Chapter 5). We compare maximum tensile strain, maximum tensile stress, and modulus respectively as a function of molecular weight as well as film thickness. We support our hypothesis on polymer inter-chain entanglements theory in thin polymer films by this molecular weight study. This thesis provides direct measurements of failure properties of ultra-thin films. These findings have important implications for the design of materials used in wide range of applications, as well as for the pursuit of new fundamental understanding of polymer physics in confined states.
Dynamics In Geometrical Confinement
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Author : Friedrich Kremer
language : en
Publisher: Springer
Release Date : 2014-06-03
Dynamics In Geometrical Confinement written by Friedrich Kremer and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-06-03 with Technology & Engineering categories.
This book describes the dynamics of low molecular weight and polymeric molecules when they are constrained under conditions of geometrical confinement. It covers geometrical confinement in different dimensionalities: (i) in nanometer thin layers or self supporting films (1-dimensional confinement) (ii) in pores or tubes with nanometric diameters (2-dimensional confinement) (iii) as micelles embedded in matrices (3-dimensional) or as nanodroplets. The dynamics under such conditions have been a much discussed and central topic in the focus of intense worldwide research activities within the last two decades. The present book discusses how the resulting molecular mobility is influenced by the subtle counterbalance between surface effects (typically slowing down molecular dynamics through attractive guest/host interactions) and confinement effects (typically increasing the mobility). It also explains how these influences can be modified and tuned, e.g. through appropriate surface coatings, film thicknesses or pore diameters. "Dynamics in Confinement" sums up the present state-of-the-art and introduces to the analytical methods of choice for the study of dynamics in nanometer-scale confinement.
Advances In Resist Technology And Processing
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Author :
language : en
Publisher:
Release Date : 2003
Advances In Resist Technology And Processing written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Photoresists categories.
Polymer Physics
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Author : Leszek A. Utracki
language : en
Publisher: John Wiley & Sons
Release Date : 2011-02-14
Polymer Physics written by Leszek A. Utracki and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-02-14 with Technology & Engineering categories.
Providing a comprehensive review of the state-of-the-art advanced research in the field, Polymer Physics explores the interrelationships among polymer structure, morphology, and physical and mechanical behavior. Featuring contributions from renowned experts, the book covers the basics of important areas in polymer physics while projecting into the future, making it a valuable resource for students and chemists, chemical engineers, materials scientists, and polymer scientists as well as professionals in related industries.
Dynamics In Small Confining Systems
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Author :
language : en
Publisher:
Release Date : 2003
Dynamics In Small Confining Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Molecular dynamics categories.
Polymer Thin Films
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Author : Ophelia K C Tsui
language : en
Publisher: World Scientific
Release Date : 2008-11-21
Polymer Thin Films written by Ophelia K C Tsui and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-11-21 with Science categories.
Polymer thin films is an emerging area driven by their enormous technological potential and the intellectually challenging academic problems associated with them. This book contains a collection of review articles on the current topics of polymer films written by leading experts in the field. To reflect the interdisciplinary nature of this field, the contributors hail from a wide range of disciplines, including chemists, chemical engineers, materials scientists, engineers, and physicists. The goal of this book is to provide readers, whether involved in or outside of the field of polymer films, with an encompassing and informative reference.