Modeling Self Assembly And Structure Property Relationships In Block Copolymers

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Modeling Self Assembly And Structure Property Relationships In Block Copolymers

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Author : Manas Ravindra Shah
language : en
Publisher:
Release Date : 2009

Modeling Self Assembly And Structure Property Relationships In Block Copolymers written by Manas Ravindra Shah and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.

Block copolymers have been subject of tremendous research interest owing to their capability of undergoing self-assembly which allows them to tailor their electrical, optical, and mechanical properties. Statistical mechanics of flexible block copolymers is well understood. However, there are many unresolved issues with confinement of block copolymers as well as structure formation in block copolymers having non-flexible polymer blocks. We develop mean field theory models to address the issues arising in thermodynamics of such complex block copolymers. Also, we develop theoretical formalisms to understand the link between morphology and macroscopic properties in these block copolymers. We study the stability and ordering in thin films of flexible diblock copolymer in the presence of compressible solvent using a combined polymer mean field theory and lattice gas model for binary fluid mixtures. We utilize mean field theory model to understand the self-assembly behavior in side-chain liquid crystalline block copolymers which involve interplay between microphase separation and liquid crystalline ordering of side chain mesogenic units. We extend the field theoretic models for block copolymer to account for self-assembly in semicrystalline block copolymers. The semicrystalline chain is modeled as a semiflexible chain having non-bonded attractions between parallel bonds. We characterize the structure formation in such block copolymers as a function of the rigidity of the semicrystalline chain. Then we extend the formalism to study semicrystalline triblock and pentablock copolymers and evaluate bridging fractions in different sequences of semicrystalline multiblock copolymers. Rod-coil block copolymers have a flexible polymer covalently linked to rigid polymer. Such polymers have potential applications as organic LEDs and photovoltaic devices. We study the self-assembly of such block copolymer under confinement. To make these block copolymers viable as photovoltaic devices, we performed the photovoltaic modeling of devices based on self-assembly of block copolymers. We characterize the interplay between self-assembly and anisotropy of charge transport (arising due to rigid polymer chains) in determining the eventual photovoltaic properties.

Toward Hierarchical Material Design Via Block Copolymers In A Protic Ionic Liquid

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Author : Ru Xie
language : en
Publisher:
Release Date : 2018

Toward Hierarchical Material Design Via Block Copolymers In A Protic Ionic Liquid written by Ru Xie and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.

Ionic liquids and block copolymers are two representative classes of “designer compounds”, which are known for tunability and controllability of their physical and chemical properties via careful selection of their components. Hierarchically structured functional materials are synthesized by self-assembly of block copolymers in ionic liquids, where the block copolymer imparts mechanical strength to the material via self-assembly into long ranged ordered structure, and the ionic liquid imparts electrical conductivity to the system via concomitant free mobile ions. ☐ Understanding the structure-property relationship of complex fluids comprised of self-assembled block copolymer in ionic liquid paves the foundation for rational design and engineering of hierarchically structured functional materials and smart devices. Thus, the goals of this dissertation are threefold: firstly, to develop structure-property relationships for complex fluid model systems composed of self-assembled non-ionic block copolymers in a protic ionic liquid at rest and under ow deformations; secondly, to synthesize and characterize a novel hierarchically structured stretchable ion-conducting material system utilized the structure-property relationship; and lastly, with the fundamental understanding of the structure-property relevancy of the materials, to design and engineer commercializable device prototypes based on the insights extracted from customer discovery interviews. ☐ A non-ionic, spherical micellar ionic liquid complex fluid model system and a non-ionic polymerlike micellar ionic liquid complex fluid model system are explored in this dissertation using a combination of advanced rheological and neutron techniques. In the spherical micellar model systems, it was found that polymer blending is an effective route to create self-assembled complex fluid model systems with tunable microstructure and rheological properties. The study of the polymerlike micellar system reveals that non-ionic polymerlike micelles have di_erent rheological signatures than non-shear banded shear thinning surfactant wormlike micelle solutions. The structure-property relationships determined for the two model systems serve as a reference for formulating and processing non-ionic block copolymer/ionic liquid complex fluids to achieve specific structures that can be crosslinked to create new functional materials. ☐ A simplified two-step manufacturing process has been developed in this dissertation to create an ultra-stretchable conductive iono-elastomer, by self-assembly of concentrated solutions of end-functionalized block copolymers in a protic ionic liquid, followed by chemical crosslinking. The resultant iono-elastomers exhibits an unprecedented combination of high stretchability (3000% elongation and 200 MPa tensile strength at break) and mechano-electrical response. To our knowledge, the strechability is about 10 times higher than reported elastomers. Importantly, the resistance of the material decreases with extension, a unique and non-trivial material response, whose origin is postulated to be the microstructural rearrangement of the micelles. Furthermore, the incorporation of water in the ionic liquid precursor leads to estimated 8.5 times less stretchability, and strikingly, the resistance of iono-elastomer increases with increasing strain. The contrary mechano-electrical response was postulated to be due to different ion binding and transport mechanism in the presence of water. ☐ Based on the material property and customer discovery interviews, a potential application of the iono-elastomer is identified as a motion strain sensor. Significant efforts are made to develop three generations of large strain amplitude, stretchable resistive strain sensor patch prototypes. They should enable customers (e.g., athletes, patients undergoing physical therapy, physical trainers, biomechanicians, etc.) to accurately track motion and performance of specific joints and/or muscles on their smart phone, tablet or computer via Bluetooth wireless communication, with applications in motion capturing, sports performance tracking and rehabilitation monitoring. ☐ Together, advanced rheological and neutron techniques provide a platform for creating structure-property relationships that predict rheological and structural phenomena in soft materials. This research is part of a broader effort to design, synthesize and characterize novel self-assembled non-ionic polymers in ionic liquids by material scientists and engineers. Finally, this work spans interests in both fundamental investigations and technical applications of non-ionic block copolymer self-assembly in ionic liquids, suggesting that the wealth of possible chemistries and ability to create a plethora of hierarchically self-assembled microstructures should lead to many new discoveries.

Impact Of Macromolecular Design On Self Assembly Properties Of Block Copolymers

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Author : Kamlesh Ramesh Bornani
language : en
Publisher:
Release Date : 2017

Impact Of Macromolecular Design On Self Assembly Properties Of Block Copolymers written by Kamlesh Ramesh Bornani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Block copolymers categories.

The generation of well-ordered complex structures from constituent block copolymeric building blocks by the spontaneous process of self-assembly is useful in various technologies. The well-defined 3D structures are dictated by complex energetic interplays and their shape is controllable by both preparative conditions and macromolecular design. This dissertation work aims at exploring the effect of chain flexibility and chain topology design changes on phase behavior of block copolymers in solution. Further, we exploit the tunable flexibility of the semiflexible polymers in studying dispersion and controlling macroscale thermal properties in polymer nanocomposites. The experimental design is based on two model systems: The first is based on polystyrene-b-poly1,3-cyclohexadiene (PS-b-PCHD). Here, the semiflexible nature of PCHD is tunable through alteration in the chain microstructure of the polymer backbone. As altered flexibility impacts the ability of chains to pack, which is shown to affect micelle morphology in solution. Further, we exploit the entropic contributions due to changes in chain configuration of PCHD (controlled through microstructure to control the dispersion of silica nanoparticles in matrices varying flexibility. Because we leave the monomer type unchanged, studying PCHD-based materials enables us to draw links between chain configuration and phase behavior. The second system is based on polystyrene-polyisoprene, (PS-PI), where multiple star copolymers were studied in a PI selective solvent. The study highlights how architecture and composition influence self-organization of the topologically-complex polymers in solution. The topological constraints introduced through architecture and composition were unable to induce any morphological changes, however design variation was successful in inducing changes in micelle size. These studies help understand the self-assembly properties of semiflexible and topologically-complex systems and provide means to control micelle properties through macromolecular design. Additionally, the macromolecular design changes also provide an opportunity to control and enhance desired properties in polymer nanocomposites. Thus, the work conducted as a part of this dissertation is very valuable to understand design-structure-property relationships by providing insights into the physics principles operating at the nanometer length scale.

Amphiphilic Block Copolymers

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Author : P. Alexandridis
language : en
Publisher: Elsevier
Release Date : 2000-10-18

Amphiphilic Block Copolymers written by P. Alexandridis and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-10-18 with Science categories.

It is the belief of the editors of this book that the recognition of block copolymers as being amphiphilic molecules and sharing common features with other well-studied amphiphiles will prove beneficial to both the surfactant and the polymer communities. An aim of this book is to bridge the two communities and cross-fertilise the different fields. To this end, leading researchers in the field of amphiphilic block copolymer self-assembly, some having a background in surfactant chemistry, and others with polymer physics roots, have agreed to join forces and contribute to this book.The book consists of four entities. The first part discusses theoretical considerations behind the block copolymer self-assembly in solution and in the melt. The second part provides case studies of self-assembly in different classes of block copolymers (e.g., polyethers, polyelectrolytes) and in different environments (e.g., in water, in non-aqueous solvents, or in the absence of solvents). The third part presents experimental tools, ranging from static (e.g., small angle neutron scattering) to dynamic (e.g., rheology), which can prove valuable in the characterization of block copolymer self-assemblies. The fourth part offers a sampling of current applications of block copolymers in, e.g., formulations, pharmaceutics, and separations, applications which are based on the unique self-assembly properties of block copolymers.

Directed Self Assembly Of Block Co Polymers For Nano Manufacturing

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Author : Roel Gronheid
language : en
Publisher: Woodhead Publishing
Release Date : 2015-07-17

Directed Self Assembly Of Block Co Polymers For Nano Manufacturing written by Roel Gronheid and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-07-17 with Technology & Engineering categories.

The directed self-assembly (DSA) method of patterning for microelectronics uses polymer phase-separation to generate features of less than 20nm, with the positions of self-assembling materials externally guided into the desired pattern. Directed self-assembly of Block Co-polymers for Nano-manufacturing reviews the design, production, applications and future developments needed to facilitate the widescale adoption of this promising technology. Beginning with a solid overview of the physics and chemistry of block copolymer (BCP) materials, Part 1 covers the synthesis of new materials and new processing methods for DSA. Part 2 then goes on to outline the key modelling and characterization principles of DSA, reviewing templates and patterning using topographical and chemically modified surfaces, line edge roughness and dimensional control, x-ray scattering for characterization, and nanoscale driven assembly. Finally, Part 3 discusses application areas and related issues for DSA in nano-manufacturing, including for basic logic circuit design, the inverse DSA problem, design decomposition and the modelling and analysis of large scale, template self-assembly manufacturing techniques. Authoritative outlining of theoretical principles and modeling techniques to give a thorough introdution to the topic Discusses a broad range of practical applications for directed self-assembly in nano-manufacturing Highlights the importance of this technology to both the present and future of nano-manufacturing by exploring its potential use in a range of fields

Structure Property Relationships In Block Copolymer Modified Epoxy Resins With Novel Morphologies

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Author : Jennifer Mary Elizabeth Dean
language : en
Publisher:
Release Date : 2002

Structure Property Relationships In Block Copolymer Modified Epoxy Resins With Novel Morphologies written by Jennifer Mary Elizabeth Dean and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.

Structure Property Relationships In Block Copolymers

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Author : John Bard
language : en
Publisher:
Release Date : 1981

Structure Property Relationships In Block Copolymers written by John Bard and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.

Block Copolymers

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Author : Nikos Hadjichristidis
language : en
Publisher: John Wiley & Sons
Release Date : 2003-04-28

Block Copolymers written by Nikos Hadjichristidis 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 2003-04-28 with Technology & Engineering categories.

Polymers may be classified as either homopolymers, consisting of one single repeating unit, or copolymers, consisting of two or more distinct repeating units. Block copolymers contain long contiguous blocks of two or more repeating units in the same polymer chain. Covering one of the hottest topics in polymer chemistry, Block Copolymers provides a coherent overview of the synthetic routes, physical properties, and applications of block copolymers. This pioneering text provides not only a guideline for developing synthetic strategies for creating block copolymers with defined characteristics, but also a key to the relationship between the physical properties of block copolymers and the structure and dynamics of materials. Covering features of the chemistry and physics of block copolymers that are not found in comparable texts, Block Copolymers illustrates the structure-activity relationship of block copolymers and offers suggestions for the design of specific applications. Divided into five sections-Block Copolymers includes chapters on: * Block Copolymers by Chemical Modification of Precursor Polymers * Nonlinear Block Copolymers * Adsorption of Block Copolymers at Solid-Liquid Interfaces * Theory of Block Copolymer Segregation * Phase Transformation Kinetics * Block Copolymer Morphology * Block Copolymer Dynamics Polymer chemists, physicists, chemical engineers, and materials scientists, as well as graduate students in polymer science, will find Block Copolymers to be an invaluable text.

Block Copolymers In Solution

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Author : Ian W. Hamley
language : en
Publisher: John Wiley & Sons
Release Date : 2005-09-02

Block Copolymers In Solution written by Ian W. Hamley 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 2005-09-02 with Science categories.

This unique text discusses the solution self-assembly of block copolymers and covers all aspects from basic physical chemistry to applications in soft nanotechnology. Recent advances have enabled the preparation of new materials with novel self-assembling structures, functionality and responsiveness and there have also been concomitant advances in theory and modelling. The present text covers the principles of self-assembly in both dilute and concentrated solution, for example micellization and mesophase formation, etc., in chapters 2 and 3 respectively. Chapter 4 covers polyelectrolyte block copolymers - these materials are attracting significant attention from researchers and a solid basis for understanding their physical chemistry is emerging, and this is discussed. The next chapter discusses adsorption of block copolymers from solution at liquid and solid interfaces. The concluding chapter presents a discussion of selected applications, focussing on several important new concepts. The book is aimed at researchers in polymer science as well as industrial scientists involved in the polymer and coatings industries. It will also be of interest to scientists working in soft matter self-assembly and self-organizing polymers.

Physical Aspects Of Polymer Self Assembly

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Author : P. R. Sundararajan
language : en
Publisher: John Wiley & Sons
Release Date : 2016-11-15

Physical Aspects Of Polymer Self Assembly written by P. R. Sundararajan 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 2016-11-15 with Science categories.

Offering an overview of principles and techniques, this book covers all major categories of self-assembled polymers – properties, processes, and design. Each chapter focuses on morphology, applications, and advanced concepts to illustrate the advantages of polymer self-assembly across industrial and academic research. • Provides an organized, comprehensive overview of polymer self-assembly, its fundamentals, principles, and applications • Includes chapters on block copolymers, amphiphilic polymers, supramolecular polymers, rotaxenes, polymer gels, dendrimers, and small molecules in polymer matrices • Focuses on novel applications, block copolymer assembly to nanotechnology, photonics and metamaterials, molecular machines and artificial muscle, gels that can be applied to polymer science, materials science, and nanotechnology • Examines state-of-the-art concepts, like lithographic patterning and foldaxane • Discusses challenges and future outlook of a popular and emerging field of study