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NMR investigation of the thermogelling properties, anomalous diffusion, and structural changes in a Pluronic F127 triblock copolymer in the presence of gold nanoparticles

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Abstract

We studied the thermogelation of a triblock copolymer Pluronic F127 (poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)) in an aqueous solvent in the presence of gold nanoparticles, using pulsed field gradient diffusion, NMR temperature experiments, relaxation measurements, and 2D heteronuclear NMR experiments. Pulsed field gradient diffusion NMR is a powerful technique to study the transition between diffusive regimes in a polymer mesh which are modulated by phase transitions in the polymeric network. In the isotropic phase, the triblock copolymer diffusion is a classical Fickian process. As the onset of gelation occurs, diffusion in the system becomes anomalous and the mean square displacement in the direction of the applied magnetic field gradient shows a power law dependence. Our experiments show that the introduction of gold nanoparticles leads to a disruption of gelation and the shifting of the formation of the ordered phase of the triblock copolymer to a higher temperature.

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Acknowledgments

All experiments were performed on Bruker Avance-III 600 MHz and 400 MHz NMR spectrometers at the NMR Research Facility at IISER Mohali. The TEM micrographs were recorded at the TEM Facility at IISER Mohali.

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  1. Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City Sector 81, SAS Nagar, Manauli PO, Punjab, 140306, India

    Jyotsana Ojha & Kavita Dorai

  2. Department of Chemistry, Bar Ilan University, 52900, Ramat Gan, Israel

    Raju Nanda

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Figure with size histogram of Pluronic F127 micelles and TEM micrographs of Pluronic F127 at different length scales. Table of diffusion coefficient values of Pluronic F127 (20 w/w%) aqueous solution in the temperature range 11-47°C. (PDF 3411 kb)

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Ojha, J., Nanda, R. & Dorai, K. NMR investigation of the thermogelling properties, anomalous diffusion, and structural changes in a Pluronic F127 triblock copolymer in the presence of gold nanoparticles. Colloid Polym Sci 298, 1571–1585 (2020). https://doi.org/10.1007/s00396-020-04740-2

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