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Shape transition in ABC triblock copolymer micelles complexed with SDS through quaternized polyvinyl pyridine central block

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Abstract

Polystyrene-b-poly-2-vinylpridine-b-polyethyleneoxide (PS13-PVPy62-PEG47) block copolymer forms spherical core-shell-corona micelles (~50 nm) in water. At acidic pH~3, the central PVPy block gets quaternized (hydrophilic) and gets complexed with sodium dodecyl sulfate (SDS), which strongly interacts with PVPy+ electrostatically as reflected from marked increase in turbidity. The charge neutralization of the central block and accordingly favored hydrophobicity induces interesting structural transitions. Cryo-TEM images for micellar solution of block copolymer in the presence of 10 mM SDS at pH~3 show presence of micelles of ribbon type and threadlike morphology. SANS measurements support the micelle growth and shape transition for the block copolymer aggregates as fitted by core-shell model.

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Acknowledgement

PB thanks UGC-DAE CSR, Mumbai center for financial assistance (project no. CRS-M-125). We thank Dr. V. K. Aswal (BARC, India) for the help in analysis of SANS data. We are grateful to Prof. Dganit Danino (Haifa, Israel) for TEM measurements. Prof. Shin Ichi Yusa (Hyogo, Japan) is acknowledged for the help in synthesis of ABC block copolymer.

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Authors and Affiliations

  1. Shah-Schulman Center for Surface Science and Nanotechnology, Dharmsinh Desai University, Nadiad, Gujarat, 387001, India

    Bhavesh Bharatiya

  2. Department of Chemistry, V.N. South Gujarat University, Surat, 395007, India

    Pratap Bahadur

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  1. Bhavesh Bharatiya
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  2. Pratap Bahadur
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Correspondence to Bhavesh Bharatiya.

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Bharatiya, B., Bahadur, P. Shape transition in ABC triblock copolymer micelles complexed with SDS through quaternized polyvinyl pyridine central block. Colloid Polym Sci 295, 1089–1093 (2017). https://doi.org/10.1007/s00396-017-4091-z

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  • DOI: https://doi.org/10.1007/s00396-017-4091-z

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