Coating of polyaniline with an insulating polymer to improve the power efficiency of electrorheological fluids
被引:14
作者:
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Akhavan, J
[1
]
Slack, K
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机构:Cranfield Univ, Royal Mil Coll Sci, Sch Engn & Appl Sci, Swindon SN6 8LA, Wilts, England
Slack, K
Wise, V
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机构:Cranfield Univ, Royal Mil Coll Sci, Sch Engn & Appl Sci, Swindon SN6 8LA, Wilts, England
Wise, V
Block, H
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机构:Cranfield Univ, Royal Mil Coll Sci, Sch Engn & Appl Sci, Swindon SN6 8LA, Wilts, England
Block, H
机构:
[1] Cranfield Univ, Royal Mil Coll Sci, Sch Engn & Appl Sci, Swindon SN6 8LA, Wilts, England
[2] Cranfield Univ, Sch Ind & Mfg Sci, Ctr Mol Elect, Cranfield MK43 0AL, Beds, England
来源:
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
|
1999年
/
13卷
/
14-16期
关键词:
D O I:
10.1142/S0217979299001983
中图分类号:
O59 [应用物理学];
学科分类号:
摘要:
Currents drawn under high fields often present practical limitations to electrorheological (ER) fluids usefulness. For heavy-duty applications where large torques have to be transmitted, the power consumption of a ER fluid can be considerable, and for such uses a current density of similar to 100 mu A cm(-2) is often taken as a practical upper limit. This investigation was conducted into designing a fluid which has little extraneous conductance and therefore would demand less current. Selected semi-conducting polymers provide effective substrates for ER fluids. Such. polymers are soft insoluble powdery materials with densities similar to dispersing agents used in ER formulations. Polyaniline is a semi-conducting polymer and can be used as an effective ER substrate in its emeraldine base form. In order to provide an effective ER fluid which requires less current polyaniline was coated with an insulating polymer. The conditions for coating was established for lauryl and methyl methacrylate. Results from static yield measurements indicate that ER fluids containing coated polyaniline required less current than uncoated polyaniline ie 0.5 mu A cm(-2). The generic type of coating was also found to be important.