Morphologies And Thermal Variability Of Patterned Polymer Films With High Molecular Weight Poly Styrene Co Maleic Anhydride

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Morphologies And Thermal Variability Of Patterned Polymer Films With High Molecular Weight Poly Styrene Co Maleic Anhydride

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Author : Pieter Samyn
language : en
Publisher:
Release Date : 2014

Morphologies And Thermal Variability Of Patterned Polymer Films With High Molecular Weight Poly Styrene Co Maleic Anhydride written by Pieter Samyn and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.

Study Of The Temperature Dependence Of The Intrinsic Viscosity Nu For Polystyrene And Poly Styrene Co Maleic Anhydride

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Author : Rong Su
language : en
Publisher:
Release Date : 1995

Study Of The Temperature Dependence Of The Intrinsic Viscosity Nu For Polystyrene And Poly Styrene Co Maleic Anhydride written by Rong Su and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Polymers categories.

"The Mark-Houwink-Sukaroda (MHS) equation [r/J = K Mva is a very important relationship to relate polymer dilute solution's intrinsic viscosity and polymer's viscosity average molecular weight. But for a wide range of polymer (copolymer) - solvent systems, the constant K and exponent a values are usually not sufficiently available. Fox - Flory and Van Krevelen dilute solution theories are employed to correlate K and a values under different temperatures therefore prove that MHS constant K and exponent a are temperature dependent for polystyrene and styrene-co-maleic anhydride. For polystyrene, the exponent a value changes from 0.7165 at 25C to 0.7327 at 45C, the literature value at 25C is about 0.72; K value changes from 0.0128 at 25C to 0.0117 at 45C, the literature value at 25C is about 0.0135. For 92/8 poly(styrene - co - maleic anhydride), the exponent a value changes from 0.7301 at 25C to 0.7414 at 45C; K values changes from 0.0115 at 25C to 0.0108 at 45C. For 86/14 polystyrene - co - maleic anhydride), exponent a value changes from 0.7469 at 25C to 0.7593 at 45C; K values changes from 0.0102 at 25C to 0.00965 at 45C. Einstein viscosity equation is a fundamental equation to calculate polymer solution viscosity from viscometric data: r/=n (l + 0.5(f)) / (H)2 s A GPC universal calibration curve based on polystyrene standards was used to work out the viscosity average molecular weight for the sample 92/8 and 86/14 poly(styrene - co - maleic anhydride); the values fall nicely into the range which is suggested by the commercial manufacturer. For 92/8 poly(styrene - co - maleic anhydride), Mv is 2.4* 105 g/mol, for 86/14 poly(styrene - co - maleic anhydride), Mv is 1.1*105 g/mol. Theoretically, solubility parameters are calculated to predict the exponent a values, but the results are not as good as the experimental method. Therefore, some new models might be suggested to predict and correlate the MHS constant K and exponent a more reasonably."--Abstract.

Glass Transition Dynamics And Heterogeneity Of Polymer Thin Films

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Author : Toshiji Kanaya
language : en
Publisher: Springer
Release Date : 2012-12-15

Glass Transition Dynamics And Heterogeneity Of Polymer Thin Films written by Toshiji Kanaya and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-15 with Technology & Engineering categories.

Mobility Gradient of Polystyrene in Films Supported on Solid Substrates, by Yoshihisa Fujii, Hiroshi Morita, Atsushi Takahara and Keiji Tanaka Probing Properties of Polymers in Thin Films Via Dewetting, by Günter Reiter Heterogeneous and Aging Dynamics in Single and Stacked Thin Polymer Films, by Koji Fukao, Takehide Terasawa, Kenji Nakamura, Daisuke Tahara Heterogeneous Dynamics of Polymer Thin Films as Studied by Neutron Scattering, by Rintaro Inoue and Toshiji Kanaya

The Combined Influence Of Molecular Weight And Temperature On The Aging And Viscoelastic Response Of A Glassy Thermoplastic Polyimide

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Author : Lee M. Nicholson
language : en
Publisher:
Release Date : 2000

The Combined Influence Of Molecular Weight And Temperature On The Aging And Viscoelastic Response Of A Glassy Thermoplastic Polyimide written by Lee M. Nicholson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.

Structure And Properties Of Oriented Films Prepared From Styrene Maleic Anhydride Copolymers And Polystyrene

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Author : Naveen Bhojraj
language : en
Publisher:
Release Date : 1992

Structure And Properties Of Oriented Films Prepared From Styrene Maleic Anhydride Copolymers And Polystyrene written by Naveen Bhojraj and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Plastic films categories.

Engineered Materials Abstracts

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Author :
language : en
Publisher:
Release Date : 1994-02

Engineered Materials Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994-02 with Ceramic materials 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.

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.

Dissertation Abstracts International

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Author :
language : en
Publisher:
Release Date : 2006

Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Dissertations, Academic categories.

Maro Polymer Notes

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Author :
language : en
Publisher:
Release Date : 1997

Maro Polymer Notes written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Polymers categories.