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Rheology of SiO2/(acrylic polymer/epoxy) suspensions. I. Linear viscoelasticity

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Abstract

Linear viscoelastic properties of SiO2/(AP/EP) suspension with various SiO2 volume fractions (ϕ) in a blend of acrylic polymer (AP) and epoxy (EP) were investigated at various temperatures (T). The AP/EP contained 70 vol.% of EP. The SiO2 particles were treated with epoxy silane coupling agent. The effects of the SiO2 particles are more pronounced in the terminal zone: a transition from viscoelastic liquid (ϕ ≤ 30 vol.%) to viscoelastic solid (ϕ ≥ 40 vol.%) was observed which can be interpreted as a critical gelation occurring at a critical particle content and critical gel temperature. The SiO2/(AP/EP) systems exhibited a critical gel behavior at ϕ ≅ 35 vol.% and T ≅ 100°C characterized with a power–law relationship between the storage and loss moduli (G ′ and G ″) and frequency (ω); G ′ = G ″/tan(nπ/2) ∝ ω n. The critical gel exponent (n) was estimated to be about 0.45. The gelation occurred with increasing T.

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Acknowledgements

Authors are grateful to Dr. T. Inada and T. Iwakura at Hitachi Chemical Co., Ltd. for support of this work.

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Authors and Affiliations

  1. Department of Polymer Science and Engineering, Yamagata University, 4-3-16, Jonan, Yonezawa, Yamagata, 992-8510, Japan

    Hideyuki Uematsu, Yuji Aoki, Masataka Sugimoto & Kiyohito Koyama

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  1. Hideyuki Uematsu
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  2. Yuji Aoki
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  3. Masataka Sugimoto
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  4. Kiyohito Koyama
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Correspondence to Kiyohito Koyama.

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Uematsu, H., Aoki, Y., Sugimoto, M. et al. Rheology of SiO2/(acrylic polymer/epoxy) suspensions. I. Linear viscoelasticity. Rheol Acta 49, 299–304 (2010). https://doi.org/10.1007/s00397-009-0423-3

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  • DOI: https://doi.org/10.1007/s00397-009-0423-3

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