Conformation and Interactions of Polystyrene and Fullerenes in Dilute to Semidilute Solutions

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• 作者：Rajeev Dattani ; Rolf Michels ; Alisyn J. Nedoma ; Ralf Schweins ; Paul Westacott ; Klaus Huber ; Jo茫o T. Cabral
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：September 9, 2014
• 年：2014
• 卷：47
• 期：17
• 页码：6113-6120
• 全文大小：497K
• ISSN：1520-5835

文摘

We report the polymer conformation and fullerene aggregation in a ternary system containing polystyrene, C₆₀, and toluene measured by small angle neutron, static, and dynamic light scattering. We investigate polymer concentrations across the dilute and semidilute regime for five polymer molecular weights (M_w = 20 kg/mol to 1 Mg/mol), and fullerene concentrations below and above its miscibility threshold in toluene. We find that the polymer radius of gyration (R_g^poly), hydrodynamic radius (R_h), and the mixture correlation length (尉) remain unchanged upon addition of C₆₀. The miscibility of C₆₀ in toluene, however, decreases upon addition of polystyrene forming aggregates with a time-dependent radius on the order of 100 nm, and this effect is amplified with increasing polymer M_w. Our findings are relevant to the solution processing of organic photovoltaics, which generally require the effective solubilization of fullerene derivatives and polymer pairs in this concentration range.