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The morphology of immiscible PDMS/PIB blends filled with silica nanoparticles under shear flow

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Abstract

The influence of surface nature (hydrophobic and hydrophilic) and concentration of silica nanoparticles on the coalescence behavior of immiscible polydimethylsiloxane (PDMS)/polyisobutylene (PIB) (90/10) blends under simple low-rate shear flow were investigated via optical shear technique. It was found that the coalescence of PIB droplets in PDMS matrix was suppressed efficiently by incorporating hydrophobic silica nanoparticles, and a constant droplet size was obtained at high particle contents. The addition of a small amount (<0.4 wt.%) of hydrophilic silica nanoparticles also decreased the size of PIB droplets. Clusters of small PIB droplets were formed at low filler concentration. When the filler concentration exceeded 0.8 wt.%, the clusters of PIB drops disappeared and elongated PIB threads with large size were formed, which suggest that the coalescence of PIB droplets was promoted. The results indicate that the discrepancy in the morphology evolution of PDMS/PIB blends upon the addition of silica nanoparticles is controlled not only by the surface chemistry of nanoparticles but also by their concentration in the blends.

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Acknowledgments

The authors are grateful to the financial support from the National Basic Research Program of China (2005CB623800). This work is also sponsored by State Key Laboratory of Polymer Materials Engineering of China, Sichuan University.

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Authors and Affiliations

  1. College of Polymer Science and Engineering, State Key Laboratory of Polymer Material Engineering, Sichuan University, Chengdu, 610065, People’s Republic of China

    Wei Tong, Yajiang Huang, Chenglei Liu, Xiaolian Chen, Qi Yang & Guangxian Li

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  1. Wei Tong
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  2. Yajiang Huang
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  3. Chenglei Liu
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  4. Xiaolian Chen
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  5. Qi Yang
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  6. Guangxian Li
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Correspondence to Yajiang Huang or Guangxian Li.

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Tong, W., Huang, Y., Liu, C. et al. The morphology of immiscible PDMS/PIB blends filled with silica nanoparticles under shear flow. Colloid Polym Sci 288, 753–760 (2010). https://doi.org/10.1007/s00396-010-2201-2

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  • DOI: https://doi.org/10.1007/s00396-010-2201-2

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