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Showing 1 to 12 of 12 for “"segmental dynamics"”.
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The Studies of Polymer Adhesion Using Segmental Dynamics Model
… have been of great success in describing the dynamics of generic polymers, but are unable to reliably simulate the mechanical deformation of polymer adhesives. Therefore, it was necessary to develop improved coarse-grained potentials for a method we call Segmental Dynamics. Segmental Dynamics …
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Structure, Thermodynamics, Mechanical Properties and Glassy Dynamics in Anisotropic Polymeric Materials
… properties thereby inducing anisotropic segmental dynamics. Either suppression or elevation of ( Tc) is predicted depending on the nature of anisotropy. Results have been obtained for liquid crystalline polymers, thin films, rubber networks and grafted polymer brushes. The underlying …
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Polymer dynamics in bulk, adsorbed and solution by NMR methods
… (²H NMR) study of bulk and adsorbed polymers. Segmental dynamics of poly(methyl acrylate) is examined in bulk and when adsorbed to anopore, alumina and silica as a function of temperature. The second part investigates diffusion of small molecules in polymer solutions by pulsed field-gradient …
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Functional Polymer Materials: From Iptycenes to Ring-Opening Polymerizations
… transition characteristics, crystallinity, segmental dynamics of PTMO, as well as high-strain-rate impact response. In Chapter 3, we describe the living cationic ring-opening polymerization of a 2-alkylthio-2-oxazoline as a general platform for postpolymerization modification. Mild …
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Polymer Melts Investigated by Field Cycling NMR Relaxometry: From Simple Liquid to Reptation Dynamics
… The objective is to understand their microscopic dynamics and its dependence on the molecular mass (M) of the polymer chains. With the commercial availability of FC NMR relaxometers, the method gained attraction for studying dynamics of soft condensed matter due to its ability to detect both the …
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Intelligent modelling and control with fatigue reduction for fes induced knee joint of hemiplegic for rehabilitation
… of equations of motion to represent the segmental dynamics and PSO optimised Neural Network - ARX to represent quadriceps muscle properties was formulated. The results show that the muscle model developed gives an accurate dynamic characterisation. Development of the FES-induced extension …
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Interface Driven Dynamics at Nanoscales:Polymer thin films and Electrical Double Layer
… and redox reaction depends on the structure and dynamics of the ions in the EDL. Thus the ion dynamics in the EDL are critical to a wide range of physical and biological phenomena such as electrochemical reaction, flow in channels of nanofluidic devices, wetting of fluids; to biology, for …
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Tunable viscoelasticity, morphology, and charge transport of dynamic covalent polymers
… Ion conductivity was strongly coupled to segmental dynamics. Li ions preferentially interact with ethylene oxide (EO) chains rather than VU sites, particularly in longer-linker systems that offer enhanced ion solvation. Salt-containing vitrimers could be reprocessed and recycled using …
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Molecular Liquids and Polymers Investigated by Field Cycling 1H NMR Relaxometry: Impact of Rotational and Translational Dynamics on Relaxation
… relaxation rate, R1=1/T1, reflects the molecular dynamics via the fluctuation of a certain interaction. In the present case of protons the spins relax due to magnetic dipole-dipole coupling which may be intra- or intermolecular. Because of the latter the proton relaxation is not only governed by …
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Advanced simulations of cross-linked thermoset and conjugated polymers for multifunctional applications
… that integrates coarse-grained molecular dynamics (CG-MD), density functional theory (DFT), and machine learning (ML) to investigate and optimize cross-linked thermosets and conjugated polymers (CPs). The first part of this study utilizes CG-MD simulations to explore how cross-link density …
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Mechanics of elastomeric copolymers
… the effect of weight fraction, morphology and segmental dynamics of hard and soft microstructures. Next, the resilience and dissipation in elastomeric segmented copolymers are examined in their connections to shape recovery under microindentation testing in experiments and numerical …
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Strukturanalyse und Segmentdynamik von Diblockcopolymer-Homopolymer-Mischungen
In der vorliegenden Arbeit wurden Mischungen <br>bestehend aus 92% Polystyrol-Polyisopren-Diblockcopolymeren <br>und 8% deuteriertem Polystyrol untersucht, wobei die <br>Zusammensetzung der Diblockcopolymere stark asymmetrisch war <br>(f(PS)=0,1). Das Molekulargewicht der verwendeten …