The stability of 44 nm diameter silica particles in poly(ethylene glycol) (PEG) melts is assessed through the experimental measurement of particle second virial coefficients, B 2 = B 2,cc /, where B 2,cc is the particle second virial coefficient and is the excluded volume second virial coefficient of the particles. Measurements are made using side bounce ultra-small-angle X-ray scattering (SBUSAXS) of dilute filled PEG melts of variable molecular weight. Results show B 2 values to be equal to or greater than one for the molecular weights investigated. Experimental results are compared to recent PRISM theory adaptations to filled polymer melts.
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Anderson et al. (2007) studied this question.
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