Abstract
The morphological hysteresis behavior of immiscible polymer blend reflects the dependence of their steady-state morphology on the shear protocol applied. In this work, the influences of hydrophobic and hydrophilic fumed silica nanoparticles on the morphology hysteresis behavior of immiscible polyisobutylene (PIB)/polydimethylsiloxane (PDMS) (10/90) blends under simple shear flow were investigated by using optical shear technique. Compared with particle-free blend, the morphology hysteresis zone of filled blends was found to be expanded by the addition of hydrophobic or hydrophilic fumed silica nanoparticles. It was found that the expansion of the morphology hysteresis zone in hydrophobic nanoparticle-filled blend stemmed from the suppression of droplet coalescence. However, the expansion in the morphological hysteresis zone for hydrophilic nanoparticle-filled blend, which was less noticeable, might originate from the more difficult breakup of PIB droplets upon the addition of nanoparticles.
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Acknowledgments
The authors are grateful for the financial support from the National Science Foundation of China (51003062, 51121001). This work is also sponsored by the State Key Laboratory of Polymer Materials Engineering of China, Sichuan University.
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He, Y., Huang, Y., Li, Q. et al. Morphological hysteresis in immiscible PIB/PDMS blends filled with fumed silica nanoparticles. Colloid Polym Sci 290, 997–1004 (2012). https://doi.org/10.1007/s00396-012-2614-1
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DOI: https://doi.org/10.1007/s00396-012-2614-1