Association of a multifunctional ionic block copolymer in a selective solvent

被引:11
作者
Etampawala, Thusitha N. [1 ]
Aryal, Dipak [1 ]
Osti, Naresh C. [1 ]
He, Lilin [2 ]
Heller, William T. [2 ]
Willis, Carl L. [3 ]
Grest, Gary S. [4 ]
Perahia, Dvora [1 ]
机构
[1] Clemson Univ, Dept Chem, Clemson, SC 29634 USA
[2] Oak Ridge Natl Lab, Biol & Soft Matter Div, Oak Ridge, TN 37831 USA
[3] Kraton Polymers US LLC, 16400 Pk Row, Houston, TX 77084 USA
[4] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA
关键词
SULFONATED PENTABLOCK COPOLYMER; ANGLE NEUTRON-SCATTERING; X-RAY-SCATTERING; DIBLOCK COPOLYMER; MICELLAR MORPHOLOGY; PHASE-BEHAVIOR; FORM-FACTORS; POLYMER; CHAIN; POLY(STYRENE-B-ISOPRENE);
D O I
10.1063/1.4967291
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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. In dilute solution the micelle increases in size as the temperature is increased, however, temperature effects dissipate with increasing solution concentration. Published by AIP Publishing.
引用
收藏
页数:9
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