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A Colloidal Approach to Study the Dispersion Characteristics of Commercially Processed Nanocomposites: Effect of Mixing Time and Processing Oil

Narayanan, Vishak
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535703328357695

Abstract Details

2018, MS, University of Cincinnati, Engineering and Applied Science: Materials Science.
Carbon black or silica filled rubber nanocomposites are perhaps the most widely available nanocomposites for commercial and industrial uses such as automotive tires, conveyor belts, power transmission belts and antivibration systems. Nanocomposites can be produced by a variety of processes. A common method used in industry is to mix a viscous polymer such as an elastomer compound, with nanofillers in a Brabender mixer or in a calendar. Irrespective of the route, the performance of a nanocomposite is largely controlled by both material and processing variables. Usually rubber products operate under a high level of filler loading and their performance is subject to the quality of dispersion of filler in a rubber matrix. Dispersion has traditionally been quantified using a mixing index, DR, that is based on micrographs of reinforced elastomers on the micron-scale. A recently developed technique based on x-ray scattering allows for an alternative nano-scale description of dispersion based on a colloidal model where an analogy is made between processing conditions such as mixing time, mixing geometry, and viscosity and temperature for a true colloidal dispersion. In this thesis, the impact of mixing time and viscosity modifiers on dispersion is investigated taking advantage of the van der Waals equation to describe excluded volume and interaction energy in the dispersion. It is found that the colloidal analogy is well behaved and can determine the wetting time for nano-scale incorporation of elastomer into filler. The excluded volume depends only on the filler type and does not seem to be sensitive to bound rubber. The pseudo-interaction energy is strongly dependent on viscosity and polymer chemistry. The colloidal model offers a novel approach to understanding dispersion in nanocomposites.
Gregory Beaucage, Ph.D. (Committee Chair)
Jude Iroh, Ph.D. (Committee Member)
Dale Schaefer, Ph.D. (Committee Member)
66 p.
Materials Science
Nanocomposite; Dispersion; Ultra-small angle X-ray scattering; Colloidal analogy; Excluded volume; Wetting time

Recommended Citations

Citations

  • Narayanan, V. (2018). A Colloidal Approach to Study the Dispersion Characteristics of Commercially Processed Nanocomposites: Effect of Mixing Time and Processing Oil [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535703328357695

    APA Style (7th edition)

  • Narayanan, Vishak. A Colloidal Approach to Study the Dispersion Characteristics of Commercially Processed Nanocomposites: Effect of Mixing Time and Processing Oil. 2018. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535703328357695.

    MLA Style (8th edition)

  • Narayanan, Vishak. "A Colloidal Approach to Study the Dispersion Characteristics of Commercially Processed Nanocomposites: Effect of Mixing Time and Processing Oil." Master's thesis, University of Cincinnati, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535703328357695

    Chicago Manual of Style (17th edition)

ucin1535703328357695
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This open access ETD is published by University of Cincinnati and OhioLINK.