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Poly(ethylene oxide)/Silica Nanocomposites: Structure and Rheology
Abstract
The effects of polymer−particle and particle−particle interactions on viscoelastic properties of nanocomposite materials are investigated using narrow molecular weight distribution poly(ethylene oxide) (PEO) containing isotropic silica nanospheres. Nanocomposites are prepared using a “freeze-drying” method to guarantee homogeneous dispersion of silica. The dispersion state of silica nanospheres is characterized by atomic force microscopy phase contrast imaging, and mechanical rheometry is used to study relaxation dynamics and viscoelastic properties of these materials in the melt state. Linear viscoelastic data indicate a transition to a solidlike response at low oscillation frequencies for particle volume fractions φ as low as 2%, dramatically lower than the theoretical percolation threshold (φ ∼ 30%). Nanoparticle volume fraction, surface chemistry, and PEO molecular weight are all found to strongly influence nanocomposite structure and dynamics. A filler networking mechanism, wherein nanosized silica particles surrounded by an immobilized shell of PEO are bridged by much larger polymer molecules, is proposed to explain our observations.
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Kirkpatrick, S. (1973) · Reviews of Modern Physics · doi:10.1103/revmodphys.45.574 · Cited by 5,260
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Bailey, E. J., & Winey, K. I. (2020) · Progress in Polymer Science · doi:10.1016/j.progpolymsci.2020.101242 · Cited by 371
Engineering Hydrogel Adhesion for Biomedical Applications via Chemical Design of the Junction
Bovone, G., Dudaryeva, O. Y., Marco-Dufort, B., & Tibbitt, M. W. (2021) · ACS Biomaterials Science & Engineering · doi:10.1021/acsbiomaterials.0c01677 · Cited by 298
Wang, J., Wang, X., Xu, C., Zhang, M., & Shang, X. (2011) · Polymer International · doi:10.1002/pi.3025 · Cited by 296
Theories and simulations of polymer-based nanocomposites: From chain statistics to reinforcement
Allegra, G., Raos, G., & Vacatello, M. (2008) · Progress in Polymer Science · doi:10.1016/j.progpolymsci.2008.02.003 · Cited by 287
Metadata
- Authors
- Zhang, Q., & Archer, L. A.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2002-11-21
- Volume
- 18
- Issue
- 26
- Pages
- 10435-10442
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2072604688
- Cited by
- 429
- References
- 1
- FWCI
- 9.29
- Type
- journal article
- Language
- en
- Open access
- closed
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