Structure Formation in Binary Polymer Systems: Short-time Dynamics and Dynamics of Crosslinked Systems PDF Download
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Author: Gaoyuan Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Structure evolution in multicomponent polymer melts and in their network equivalents is investigated. In the first part, particle-based simulations reveal that on short length and time scales, the collective kinetics of structure formation and relaxation of polymeric systems is influenced by the sub-diffusive single-chain dynamics. D-RPA and D-SCFT are employed to describe the collective behavior in the simulation. D-RPA successfully captures the observed time evolution of density fluctuations on short time scales, whereas D-SCFT fails to provide an appropriate description on time scales mu...
Author: Gaoyuan Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Structure evolution in multicomponent polymer melts and in their network equivalents is investigated. In the first part, particle-based simulations reveal that on short length and time scales, the collective kinetics of structure formation and relaxation of polymeric systems is influenced by the sub-diffusive single-chain dynamics. D-RPA and D-SCFT are employed to describe the collective behavior in the simulation. D-RPA successfully captures the observed time evolution of density fluctuations on short time scales, whereas D-SCFT fails to provide an appropriate description on time scales mu...
Author: Douglas Grzetic
Publisher:
ISBN:
Category :
Languages : en
Pages :
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We explore the role of chain diffusion in the structure formation of dense, inhomogeneous polymeric systems, in the first application to polymers of our recently-developed dynamical self-consistent field theory [1, 2]. Our approach enables us to study large length and time scales in these dense systems, while remaining connected, in a self-consistent manner, to the dynamics of our microscopic model for the many-body interacting problem. Our theory is highly flexible, can be modified to describe different polymeric systems, and can even be extended to applications beyond polymers, in the broader field of classical soft matter. We describe the numerical implementation of our technique, and characterize the sources of numerical error and the presence of finite chain-length effects. We apply the theory to the problem of spinodal decomposition in the binary homopolymer blend, and show that the theory captures the physics of spinodal decomposition, through our analysis of the early-time growth of composition fluctuations and the late-time coarsening of domains. The late-time scaling regime, characteristic of spinodal decomposition, sets in and a single growing length-scale L(t) emerges, describing the domain sizes, which satisfies the Lifshitz- Slyozov-Wagner power law L(t) ~ t^1/3. We then construct a theoretical framework in which the chain self-diffusion in ordered phases of the unentangled diblock copolymer melt can be explored systematically. The chain dynamics in the lamellar (LAM), cylindrical (HEX), spherical (BCC) and gyroid (GYR) phases exhibit distinct diffusive behaviours corresponding to diffusion parallel to the domain interfaces (free diffusion, independent of segregation strength) and suppressed diffusion perpendicular to the interfaces (hopping diffusion, with a segregation strength dependence), leading to an anisotropy in diffusivity for the lamellar and cylindrical phases that is in agreement with the literature. In the gyroid phase, our diffusion measurements are consistent with a network tortuosity value of 1.72, close to the literature value of 1.5. Finally, we measure the chain centre-of-mass diffusion coefficients during a phase transformation from metastable LAM to stable HEX over long times. This demonstrates the ability of our theory to simultaneously track the dynamics of individual chains (short time-scales) and simulate large-scale structure evolution (long time-scales).
Author: Changlai Yang
Publisher:
ISBN:
Category : Chemical structure
Languages : en
Pages : 548
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Author:
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Category : Dissertations, Academic
Languages : en
Pages : 652
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Author: Edward M. Petrie
Publisher: McGraw Hill Professional
ISBN: 0071589082
Category : Technology & Engineering
Languages : en
Pages : 553
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Unmodified, epoxy resins cause certain problems for both the adhesive formulator and end-user. They are often rigid and brittle; hence, impact resistance and peel strength are poor. For decades, Chemist have been vigorously working to minimize these major shortcomings. Based on a popular course sponsored by the Society of Plastics Engineers and written by an authority in the field, this comprehensive text presents a variety of methods to accomplish what up to now has been a formidable task. Beginning with epoxy chemistry, moving on to fillers, filler treatments, and surfactants, and ending with current and future development in formulating Epoxy Adhesives, this rigorous text addressed the problem of improving flexibility, durability and strength by adding chemical groups to the epoxy structure either via the base resin or the curing agent or by adding separate flexibilizing resins to the formulation to create an epoxy-hybrid adhesive.
Author: Axel H. E. Müller
Publisher: Springer Science & Business Media
ISBN: 3642128750
Category : Science
Languages : en
Pages : 264
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-Effects of Electric Fields on Block Copolymer Nanostructures By H. G. Schoberth, V. Olszowka, K. Schmidt, and A. Böker -Nanopattern Evolution in Block Copolymer Films: Experiment, Simulations and Challenges By L. Tsarkova, G.J. Agur Sevink, and G. Krausch -Controlled Wrinkling as a Novel Method for the Fabrication of Patterned Surfaces By A. Schweikart, A. Horn, A. Böker, and A. Fery -Layered Systems Under Shear Flow By D. Svenšek and H. R. Brand -Thermal Diffusion in Polymer Blends: Criticality and Pattern Formation By W. Köhler, A. Krekhov, and W. Zimmermann -Foaming of Microstructured and Nanostructured Polymer Blends By H. Ruckdäschel, P. Gutmann, V. Altstädt, H. Schmalz, and A.H.E. Müller
Author: National Institute of Standards and Technology (U.S.)
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 464
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Author: Robert W. Cahn
Publisher: Wiley-VCH
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 812
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V. 12. Structure and properties of polymers.
Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 820
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Author:
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 2566
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