Association of a multifunctional ionic block copolymer in a selective solvent

Etampawala, Thusitha N.; Aryal, Dipak; Osti, Naresh C.; He, Lilin; Heller, William T.; Willis, Carl L.; Grest, Gary S.; Perahia, Dvora

doi:10.1063/1.4967291

Association of a multifunctional ionic block copolymer in a selective solvent

Journal Article · Sun Nov 13 23:00:00 EST 2016 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4967291· OSTI ID:1332952

Etampawala, Thusitha N. ^[1]; Aryal, Dipak ^[1]; ^[1]; He, Lilin ^[2]; ^[2]; Willis, Carl L. ^[3]; ^[4]; Perahia, Dvora ^[1]

Clemson Univ., Clemson, SC (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Kraton Polymers US LLC, Houston, TX (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

The self-assembly of multiblock copolymers in solutions is controlled by a delicate balance between inherent phase segregation due to incompatibility of the blocks and the interaction of the individual blocks with the solvent. The current study elucidates the association of pentablock copolymers in a mixture of selective solvents which are good for the hydrophobic segments and poor for the hydrophilic blocks using small angle neutron scattering (SANS). The pentablock consists of a center block of randomly sulfonated polystyrene, designed for transport, tethered to poly-ethylene-r-propylene and end-capped by poly-t-butyl styrene, for mechanical stability. We find that the pentablock forms ellipsoidal core-shell micelles with the sulfonated polystyrene in the core and Gaussian decaying chains of swollen poly-ethylene-r-propylene and poly-t-butyl styrene tertiary in the corona. With increasing solution concentration, the size of the micelle, the thickness of the corona, and the aggregation number increase, while the solvent fraction in the core decreases. As a result, in dilute solution the micelle increases in size as the temperature is increased, however, temperature effects dissipate with increasing solution concentration.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1332952

Alternate ID(s):: OSTI ID: 1332014

Report Number(s):: SAND--2016-11506J; 649110

Journal Information:: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 18 Vol. 145; ISSN JCPSA6; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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