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Effect of heating rate on thermo-induced aggregation of poly(ethylene oxide)-b-poly(N-isopropylacrylamide) in aqueous solutions

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Abstract

The effects of heating rate on the aggregate behavior of poly(ethylene oxide)-b-poly(N-isopropylacrylamide) in aqueous solutions were investigated in detail by laser light scattering and TEM. By employing two separate heating protocols, step-by-step heating at < 5 K/step and one-step jump, to heat the sample from 15°C to the selected temperature, we found that the heating rate only showed significant effect on the aggregates above the cloud point. The aggregate formed by step-by-step heating exhibited a much larger size and a broader size distribution than those formed by one-step jump heating. Moreover, neither of the aggregates were ideal micellar structures as indicated by the size and the R g/R h values. On the contrary, at temperatures below the cloud point where the block copolymer formed core-shelled micelles, the heating rate showed negligible effect on the size and size distribution of the micelles. Since the system underwent a phase separation above the cloud point, the heating rate effect could be reasonably explained by the phase separation mechanisms: the nucleation-and-growth mechanism in the metastable region and the spinodal decomposition mechanism in the unstable region.

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Authors and Affiliations

  1. Beijing National Laboratory for Molecular Sciences and the Key Laboratory of Polymer Chemistry & Physics of Ministry of Education, College of Chemistry & Molecular Engineering, Peking University, Beijing, 100871, China

    Jing-jing Yan, Wen-xi Ji, Er-qiang Chen, Zi-chen Li & De-hai Liang  (梁德海)

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  1. Jing-jing Yan
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  2. Wen-xi Ji
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  3. Er-qiang Chen
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  4. Zi-chen Li
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  5. De-hai Liang  (梁德海)
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Correspondence to De-hai Liang  (梁德海).

Additional information

This work was financially supported by the National Natural Science Foundation of China (No. 20504001).

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Yan, Jj., Ji, Wx., Chen, Eq. et al. Effect of heating rate on thermo-induced aggregation of poly(ethylene oxide)-b-poly(N-isopropylacrylamide) in aqueous solutions. Chin J Polym Sci 28, 437–447 (2010). https://doi.org/10.1007/s10118-010-9085-y

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  • DOI: https://doi.org/10.1007/s10118-010-9085-y

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