The effects of staged mixing on the dispersion of reinforcing fillers in elastomer compounds

POLYMER

卷:181

Article

McGlasson, Alex¹  Rishi, Kabir¹  Beaucage, Gregory¹  Narayanan, Vishak¹  Chauby, Michael¹  Mulderig, Andrew¹  Kuppa, Vikram K.²  Ilavsky, Jan³  Rackaitis, Mindaugas⁴ 

[1] Univ Cincinnati, Cincinnati, OH 45221 USA

[2] Univ Dayton, Nonstruct Mat Div, Res Inst, Dayton, OH 45469 USA

[3] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[4] Bridgestone Amer Ctr Res & Technol, Akron, OH 44301 USA

关键词: Nanocomposite;    Ultra small-angle X-ray scattering;    Kinetic dispersion;    Colloidal model;    van der Waals;    Excluded volume;    Accumulated strain;    Carbon coverage on silica surface;   

DOI  :  10.1016/j.polymer.2019.121765

来源: Elsevier

【 摘 要 】

Kinetically mixed reinforcing fillers are dispersed by accumulated strain. Processing conditions such as mixing geometry, intensity and the duration of mixing are key elements that control accumulated strain. A simple method to modify mechanical mixing is the mixing schedule which involves the timing of filler additions to a compound. For example, it is known that simultaneous addition of oil with filler is disadvantageous to dispersion, while the incorporation of oil after filler addition enhances dispersion. The simplest case of mixing schedule involves timed filler additions into an elastomer, for instance in a single stage or in two-stages. This study explores the effects of staged mixing on nanoscale dispersion based on a colloidal model. Dispersion is quantified using a pseudo-thermodynamic approach coupled with ultra-small angle X-ray scattering. It was found that single stage mixing yields optimal nano-dispersion for carbon-coated silica and carbon black in polybutadiene using an internal mixer.

【 授权许可】

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