Record number :
1785508
Title of article :
SAXS study of the swelling and shear orientation of the lamellar phase formed by a diblock copolymer
Author/Authors :
Castelletto، نويسنده , , Valeria and Fisher، نويسنده , , Julie and Hamley، نويسنده , , Ian W and Yang، نويسنده , , Zhuo، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2002
Pages :
10
From page :
9
To page :
18
Abstract :
The swelling of the lamellar phase of a diblock copolymer, E18B10, has been studied using small-angle X-ray scattering (SAXS). Deviations from the expected swelling law for constant thickness bilayers are ascribed to the formation of pore defects in the lamellar phase (so-called ‘mesh’ phase), as temperature is increased. This is supported by deuterium NMR data for the diblock in D2O, which indicate well-ordered lamellae at low temperature, but increasing fractions of mobile D2O at high temperature. The orientation of the lamellar phase under steady shear is studied via SAXS. At high shear rates, the lamellae are predominantly oriented with their normals along the neutral direction (perpendicular orientation). At lower shear rates, the unfavourable orientation with lamellar normals along the shear direction is observed as a transient state.
Keywords :
Diblock copolymer , Swelling , Lamellar phase , Sheer orientation
Journal title :
Colloids and Surfaces A Physicochemical and Engineering Aspects
Journal title :
Colloids and Surfaces A Physicochemical and Engineering Aspects
Serial Year :
2002
Link To Document :
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