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oai:mountainscholar.org:10217/791822025-12-30T03:34:35Zcom_10217_100532com_10217_100000com_10217_100365com_10217_100303col_10217_100538col_10217_100366

Sandhu, Paramvir, author Wang, Qiang (David), advisor Bailey, Travis S., committee member Szamel, Grzegorz, committee member 2007-01-03T05:33:58Z 2007-01-03T05:33:58Z 2013 Sandhu_colostate_0053N_11571.pdf http://hdl.handle.net/10217/79182 https://doi.org/10.25675/3.018819 In the widely used dissipative particle dynamics (DPD) simulations 1, polymers are commonly modeled as discrete Gaussian chains interacting with soft, finite-range repulsions. In the original DPD simulations of microphase separation of diblock copolymer melts by Groot and Madden 2 , the simulation results were compared and found to be consistent with the phase diagram for the "standard model" of continuous Gaussian chains with Dirac δ-function interactions obtained from self-consistent field (SCF) calculations. Since SCF theory is a mean-field theory neglecting system fluctuations/correlations while DPD simulations fully incorporate such effects, the model differences are mixed with the fluctuation/correlation effects in their comparison. Here we report the SCF phase diagram for exactly the same model system as used in DPD simulations. Comparing our phase diagram with that for the standard model highlights the effects of chain discretization and finite-range interactions, while comparing our phase diagram with DPD simulation results unambiguously (without any parameter-fitting) reveal the effects of system fluctuations/correlations neglected in the SCF theory. born digital masters theses English eng Colorado State University. Libraries 2000-2019 Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. copolymers SCFT fluctuations DPD diblock Disentangle model differences and fluctuation effects in DPD simulations of diblock copolymers Text Master of Science (M.S.) Masters Chemical and Biological Engineering Colorado State University This Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). open.access