Structure-stress relaxation relationship in polystyrene/fluorohectorite micro-and nanocomposites |
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Authors: | S Siengchin T N Abraham J Karger-Kocsis |
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Institution: | 1. Institute for Composite Materials, Kaiserslautern University of Technology, Erwin Schr?dinger St., D-67663, Kaiserslautern, Germany
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Abstract: | Sodium fluorohectorite (FH) was incorporated into polystyrene (PS) in amounts of 4.5 and 7 wt.% by melt mixing, with and without
latex precompounding. The latex precompounding was used for the latex-mediated predispersion of FH particles. The related
masterbatch was produced by mixing PS latex with the water-swellable FH, followed by drying. The dispersion of FH in PS was
studied by transmission-, scanning electron-, and atomic force microscopy techniques (TEM, SEM, and AFM, respectively). The
stress relaxation in the PS composites was determined in short-term isothermal tests. The latter were performed at various
temperatures between 25 and 75°C. The direct melt mixing of FH with PS resulted in microcomposites, whereas the masterbatch
technique gave rise to nanocomposites. The master curves (relaxation modulus vs. time), constructed by applying the time-temperature
superposition principle (TTSP), showed that the Williams-Landel-Ferry (WLF) equation, the Maxwell model, and the Findley power
law were fairly applicable to the experimental results obtained.
Russian translation published in Mekhanika Kompozitnykh Materialov, Vol. 44, No. 5, pp. 709–722, September–October, 2008. |
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Keywords: | polystyrene fluorohectorite microcomposite nanocomposite stress relaxation WLF equation Maxwell and Findley power-law models |
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