Aggregation Behavior of Polystyrene-b-poly(ethylene/butylene)-b-polystyrene Triblock Copolymer in N-Methylpyrrolidone

作者：Ogata Yoichi^*; Mogi Takeshi; Makita Yutaka

来源：Journal of Polymer Science Part B: Polymer Physics , 2010, 48(5): 588-594.

DOI：10.1002/polb.21926

• aggregation
• association
• block copolymers
• dynamic light scattering
• light scattering
• micelles
• microstructure
• solution properties
• structural characterization
• structure-property relations
• triblock copolymers

Solution property of hydrogenated polystyrene-b-poly(ethylene/butylene)-b- polystyrene triblock copolymer (SEBS copolymer) was studied by using static light scattering and dynamic light scattering for cyclohexane and N-methylpyr-rolidone (NMP) solutions. From the values of dimensionless parameters rho, defined as the ratio of radius of gyration < S(2)>(1/2) to hydrodynamic radius R(H), and solubility parameters, SEBS copolymer proved to exist as single chain close to random coil in nonpolar cyclohexane, whereas aggregate into the core-shell micelle consisting of poly(ethylene/butylene) (PEB) core surrounded by PS shell in polar NMP. The core-shell micelle formed in NMP is composed of 65 polymer chains, having three times larger average chain density (d = 0.12 g cm(-3)) than a single polymer chain (d = 0.04 g cm(-3)) in cyclohexane. The comparison with the aggregation behaviors in other solvents demonstrated that the aggregate compactness of the copolymer depended largely on solvent polarity, resulting i

• 出版日期2010-3-1