A Colloidal Approach to Study the Dispersion Characteristics of Commercially Processed Nanocomposites: Effect of Mixing Time and Processing Oil
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University of Cincinnati / OhioLINK
2018
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535703328357695 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-ucin15357033283576952021-08-03T07:08:29Z A Colloidal Approach to Study the Dispersion Characteristics of Commercially Processed Nanocomposites: Effect of Mixing Time and Processing Oil Narayanan, Vishak Materials Science Nanocomposite Dispersion Ultra-small angle X-ray scattering Colloidal analogy Excluded volume Wetting time 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. 2018 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535703328357695 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535703328357695 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Materials Science Nanocomposite Dispersion Ultra-small angle X-ray scattering Colloidal analogy Excluded volume Wetting time |
| spellingShingle |
Materials Science Nanocomposite Dispersion Ultra-small angle X-ray scattering Colloidal analogy Excluded volume Wetting time Narayanan, Vishak A Colloidal Approach to Study the Dispersion Characteristics of Commercially Processed Nanocomposites: Effect of Mixing Time and Processing Oil |
| author |
Narayanan, Vishak |
| author_facet |
Narayanan, Vishak |
| author_sort |
Narayanan, Vishak |
| title |
A Colloidal Approach to Study the Dispersion Characteristics of Commercially Processed Nanocomposites: Effect of Mixing Time and Processing Oil |
| title_short |
A Colloidal Approach to Study the Dispersion Characteristics of Commercially Processed Nanocomposites: Effect of Mixing Time and Processing Oil |
| title_full |
A Colloidal Approach to Study the Dispersion Characteristics of Commercially Processed Nanocomposites: Effect of Mixing Time and Processing Oil |
| title_fullStr |
A Colloidal Approach to Study the Dispersion Characteristics of Commercially Processed Nanocomposites: Effect of Mixing Time and Processing Oil |
| title_full_unstemmed |
A Colloidal Approach to Study the Dispersion Characteristics of Commercially Processed Nanocomposites: Effect of Mixing Time and Processing Oil |
| title_sort |
colloidal approach to study the dispersion characteristics of commercially processed nanocomposites: effect of mixing time and processing oil |
| publisher |
University of Cincinnati / OhioLINK |
| publishDate |
2018 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535703328357695 |
| work_keys_str_mv |
AT narayananvishak acolloidalapproachtostudythedispersioncharacteristicsofcommerciallyprocessednanocompositeseffectofmixingtimeandprocessingoil AT narayananvishak colloidalapproachtostudythedispersioncharacteristicsofcommerciallyprocessednanocompositeseffectofmixingtimeandprocessingoil |
| _version_ |
1719454631535312896 |