Rationalizing the phase behavior of triblock-copolymers through experiments and molecular simulations
Perez-Sanchez, German and Vicente, Filipa A. and Schaeffer, Nicolas and Cardoso, Inês S. and Ventura, Sonia P.M. and Jorge, Miguel and Coutinho, Joao A.P. (2019) Rationalizing the phase behavior of triblock-copolymers through experiments and molecular simulations. Journal of Physical Chemistry C, 123 (34). pp. 21224-21236. ISSN 1932-7447 (https://doi.org/10.1021/acs.jpcc.9b04099)
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Abstract
In this paper, we develop a new coarse-grained model, under the MARTINI framework, for Pluronic block copolymers that is able to describe the self-assembly mechanism and reproduce experimental micelle sizes and shapes. Previous MARTINI-type Pluronic models were unable to produce realistic micelles in aqueous solution, and thus our model represents a marked improvement over existing approaches. We then applied this model to understand the effects of polymer structure on the cloud point temperature measured experimentally for a series of Pluronics, including both normal and reverse copolymers. It was observed that high polyoxypropylene glycol content leads to dominant hydrophobic interactions and a lower cloud point temperature, while high hydrophilic polyoxyethylene glycol content shields the micelles against aggregation and hence leads to a higher cloud point temperature. As the concentration increases, the effect of polymer architecture (normal versus reverse) starts to dominate, with reverse Pluronics showing a lower cloud point temperature. This was shown to be due to the increased formation of cross-links between neighboring micelles in these systems, which promote micelle aggregation. Our results shed new light on these fascinating systems and open the door to increased control of their thermal responsive behavior.
ORCID iDs
Perez-Sanchez, German, Vicente, Filipa A., Schaeffer, Nicolas, Cardoso, Inês S., Ventura, Sonia P.M., Jorge, Miguel ORCID: https://orcid.org/0000-0003-3009-4725 and Coutinho, Joao A.P.;-
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Item type: Article ID code: 69241 Dates: DateEvent29 August 2019Published5 August 2019Published Online5 August 2019AcceptedSubjects: Science > Chemistry
Technology > Chemical engineeringDepartment: Strategic Research Themes > Measurement Science and Enabling Technologies
Strategic Research Themes > Energy
Strategic Research Themes > Advanced Manufacturing and Materials
Faculty of Engineering > Chemical and Process EngineeringDepositing user: Pure Administrator Date deposited: 08 Aug 2019 11:27 Last modified: 26 Nov 2024 17:28 URI: https://strathprints.strath.ac.uk/id/eprint/69241