Electrorheological Properties of Suspensions Prepared from Poly(Li-tert-butyl methacrylate) Ionomer

Mustafa YAVUZ

Makale detayları

Electrorheological Properties of Suspensions Prepared from Poly(Li-tert-butyl methacrylate) Ionomer

Yazarlar:

Mustafa YAVUZ

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2004 Vol.28 Issue 5, pp.587-602

Belge Tipi:

Makale

Yayın Tarihi:

4/2004

Belge Dili:

Türkçe

Document ID (Org No.):

2000729250

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

Özet:

 

The synthesis, characterisation and partial hydrolysis of  poly(tert-butylmethacrylate), (PTBMA), and the electrorheological (ER)  properties of its suspensions were investigated.  The polymer was  synthesised by radical polymerisation and partially hydrolysed by  para-toluenesulphonic acid monohydrate (PTSA.H2O), and then converted  to a lithium salt (PTBMA-Li) by washing with a LiOH(aq) solution.   From particle size measurements, the average particle size of PTBMA-Li  was determined to be 74 m m.  Colloidal suspensions of ionomer were  prepared in various insulating oils [silicone oil (SO), mineral oil  (MO), threeoctylthreemellitate (TOTM) and dioctylphatalete (DOP)] at a  series of concentrations (c = 5-33 m/m, %).  The sedimentation  stabilities of these suspensions were determined at 20 °C and were  observed to increase with decreasing suspension concentration.   Maximum gravitational stability was observed as 32 days in SO at c = 5  m/m, %.  Flow times of suspensions were measured under no applied  electric field (E = 0 kV/mm), and under an external electric field (E  \ne 0 kV/mm), and ER activity was determined.  The highest flow time  was found to be 32 s in SO at c = 33 m/m, %.  Further, the effects of  solid particle concentration, shear rate (g), electric field  strength, (E) addition of polar promoters and high temperature on the  ER activities of colloidal suspensions were investigated.  Excess  shear stresses (D t) were determined to be 74 Pa under E = 1.0  kV/mm.

 

The synthesis, characterisation and partial hydrolysis of  poly(tert-butylmethacrylate), (PTBMA), and the electrorheological (ER)  properties of its suspensions were investigated.  The polymer was  synthesised by radical polymerisation and partially hydrolysed by  para-toluenesulphonic acid monohydrate (PTSA.H2O), and then converted  to a lithium salt (PTBMA-Li) by washing with a LiOH(aq) solution.   From particle size measurements, the average particle size of PTBMA-Li  was determined to be 74 m m.  Colloidal suspensions of ionomer were  prepared in various insulating oils [silicone oil (SO), mineral oil  (MO), threeoctylthreemellitate (TOTM) and dioctylphatalete (DOP)] at a  series of concentrations (c = 5-33 m/m, %).  The sedimentation  stabilities of these suspensions were determined at 20 °C and were  observed to increase with decreasing suspension concentration.   Maximum gravitational stability was observed as 32 days in SO at c = 5  m/m, %.  Flow times of suspensions were measured under no applied  electric field (E = 0 kV/mm), and under an external electric field (E  \ne 0 kV/mm), and ER activity was determined.  The highest flow time  was found to be 32 s in SO at c = 33 m/m, %.  Further, the effects of  solid particle concentration, shear rate (g), electric field  strength, (E) addition of polar promoters and high temperature on the  ER activities of colloidal suspensions were investigated.  Excess  shear stresses (D t) were determined to be 74 Pa under E = 1.0  kV/mm.

Makale detayları

Electrorheological Properties of Suspensions Prepared from Poly(Li-tert-butyl methacrylate) Ionomer

Yazarlar: Mustafa YAVUZ

Yayıncı: TUBITAK

Dergi: Turkish Journal of Chemistry 2004 Vol.28 Issue 5, pp.587-602

Belge Tipi: Makale

Yayın Tarihi: 4/2004

Belge Dili: Türkçe

Document ID (Org No.): 2000729250

Sıklık: İki Aylık

eISSN: 1303-6130

pISSN: 1300-0527

Sayı

Yazarlar:

Mustafa YAVUZ

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2004 Vol.28 Issue 5, pp.587-602

Belge Tipi:

Makale

Yayın Tarihi:

4/2004

Belge Dili:

Türkçe

Document ID (Org No.):

2000729250

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527