Mechanical Properties Of Ultrathin Polymer Films
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Mechanical Properties Of Ultrathin Polymer Films
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Author : Shanhong Xu
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2012
Mechanical Properties Of Ultrathin Polymer Films written by Shanhong Xu 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 2012 with categories.
It is very important to understand the mechanical properties of polymers at the nanoscale with the continuing demand of decreasing the size of circuit in the electronic industry. There has been considerable research on the confinement effect in thin films with a variety of techniques, often with conflicting results. We developed the stress-strain analysis and energy balance approach to separate the surface tension contribution to the observed rubbery stiffening. Further, the geometry effect in the nanobubble inflation technique was investigated by comparing the creep behavior of circular bubbles with that of rectangular bubbles. Next, we investigated the molecular architecture effect in the nanobubble inflation technique by comparing the creep behavior of linear PS with that of the three-arm star PS. In the last part of this thesis, the capability of the nanobubble inflation technique to investigate the yield and fracture behavior of ultrathin films was demonstrated.
Thermal And Rheological Properties Of Ultrathin Polymer Films Using Nanorheological Techniques
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Author : Cynthia Kho Buenviaje
language : en
Publisher:
Release Date : 2001
Thermal And Rheological Properties Of Ultrathin Polymer Films Using Nanorheological Techniques written by Cynthia Kho Buenviaje and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Thin films categories.
Physical Properties Of Ultrathin Polymer Films And Quantifying Interfacial Interactions Using A Quartz Crystal Resonator
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Author : James Nelson D'Amour
language : en
Publisher:
Release Date : 2005
Physical Properties Of Ultrathin Polymer Films And Quantifying Interfacial Interactions Using A Quartz Crystal Resonator written by James Nelson D'Amour and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
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 (
Interfacial Effects And Properties Of Ultrathin Polymer Films
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Author : Bryan D. Vogt
language : en
Publisher:
Release Date : 2005
Interfacial Effects And Properties Of Ultrathin Polymer Films written by Bryan D. Vogt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Chemical engineering categories.
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.
Tailoring Nanoscale Properties Of Ultrathin Polymer Brush Films
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Author : Melburne Charles LeMieux
language : en
Publisher:
Release Date : 2003
Tailoring Nanoscale Properties Of Ultrathin Polymer Brush Films written by Melburne Charles LeMieux and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
The conformation of a polymer chain is very sensitive to changes in the surrounding environment. When polymer chains are chemically tethered at one end to a solid substrate or interface with a sufficiently high grafting density, the chains avoid overlapping and stretch along the surface normal to form a polymer brush layer. Thus, substrates and interfaces can be modified with thin (2-100 nm) highly dense polymer layers that have the ability to adapt, or exhibit switching of surface morphologies according to changes in their surrounding medium, such as solvent quality or pH. Dense, uniform glassy and rubbery brush layers were fabricated and thermal, mechanical, and thermo-elastic properties of the layers were directly measured with nanoscale resolution for the first time and compared with values found for polymer chains in the bulk state. For the binary polymer brush layers, atomic force microscopy "force volume" experiments indicate the bimodal response of the mechanically heterogeneous surface, with elastic modulus and adhesion distributions very different for the "glassy state" and the "rubbery state". We demonstrate the complete reversible tailoring of one polymer brush layer possessing a very adhesive surface with elastic modulus around 50 MPa upon exposure to acetone, and switching to a glassy low energy surface with elastic modulus around 1-2 GPa after quick exposure to toluene. Such a surface is of great interest because versatile microsystems are now being designed that integrate mechanical, optical, fluidic, chemical gating, and biological devices to perform complex sensing functions.
Functional Polymer Films 2 Volume Set
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Author : Wolfgang Knoll
language : en
Publisher: John Wiley & Sons
Release Date : 2013-02-12
Functional Polymer Films 2 Volume Set written by Wolfgang Knoll 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 2013-02-12 with Science categories.
Very thin film materials have emerged as a highly interesting and useful quasi 2D-state functionality. They have given rise to numerous applications ranging from protective and smart coatings to electronics, sensors and display technology as well as serving biological, analytical and medical purposes. The tailoring of polymer film properties and functions has become a major research field. As opposed to the traditional treatise on polymer and resin-based coatings, this one-stop reference is the first to give readers a comprehensive view of the latest macromolecular and supramolecular film-based nanotechnology. Bringing together all the important facets and state-of-the-art research, the two well-structured volumes cover film assembly and depostion, functionality and patterning, and analysis and characterization. The result is an in-depth understanding of the phenomena, ordering, scale effects, fabrication, and analysis of polymer ultrathin films. This book will be a valuable addition for Materials Scientists, Polymer Chemists, Surface Scientists, Bioengineers, Coatings Specialists, Chemical Engineers, and Scientists working in this important research field and industry.
Polymer Thin Films
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Author : Ophelia Kwan Chui Tsui
language : en
Publisher: World Scientific
Release Date : 2008
Polymer Thin Films written by Ophelia Kwan Chui 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 with Science categories.
Ch. 1. Block copolymer thin films / J.-Y. Wang, S. Park and T. P. Russell -- ch. 2. Equilibration of block copolymer films on chemically patterned surfaces / G. S. W. Craig, H. Kang and P. F. Nealey -- ch. 3. Structure formation and evolution in confined cylinder-forming block copolymers / G. J. A. Sevink and J. G. E. M. Fraaije -- ch. 4. Block copolymer lithography for magnetic device fabrication / J. Y. Cheng and C. A. Ross -- ch. 5. Hierarchical structuring of polymer nanoparticles by self-organization / M. Shimomura ... [et al.] -- ch. 6. Wrinkling polymers for surface structure control and functionality / E. P. Chan and A. J. Crosby -- ch. 7. Crystallization in polymer thin films: morphology and growth / R. M. Van Horn and S. Z. D. Cheng -- ch. 8. Friction at soft polymer surface / M. K. Chaudhury, K. Vorvolakos and D. Malotky -- ch. 9. Relationship between molecular architecture, large-strain mechanical response and adhesive performance of model, block copolymer-based pressure sensitive adhesives / C. Creton and K. R. Shull -- ch. 10. Stability and dewetting of thin liquid films / K. Jacobs, R. Seemann and S. Herminghaus -- ch. 11. Anomalous dynamics of polymer Films / O. K. C. Tsui.
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.