Effect of steady shear on multi-axial texture of symmetric diblock copolymers

XU Hui; LIU Honglai; HU Ying

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Effect of steady shear on multi-axial texture of symmetric diblock copolymers

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The effect of steady shear on multi-axial texture of symmetric diblock copolymer was investigated by using dynamic density functional theory.Through modifying the periodic boundary condition,the parallel-transverse biaxial texture and perpendicular-parallel-transverse triaxial texture have been observed.In the formation of the multi-axial texture,there are two critical velocities uper-par and upartra,at which the transition between the perpendicular and the parallel lamellar morphology,and the transition between the parallel and the transverse lamellar morphology occur,respectively.The two critical velocities increase as the inter-action parameter increases,but they almost remain constant at different shear rates.Furthermore,the rotation from the transverse lamellae to the parallel lamellae induced by the shear strain,and the increase of lamellar spacings of the three lamellae after removing the shear,have also been observed by the time evolution of the morphologies.These phenomena are consistent with experimental work.

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来源
《化学科学与工程前沿：英文版》 |2007年第1期|26-34|共9页
作者
XU Hui; LIU Honglai; HU Ying;
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作者单位

Lab for Advanced Materials and Department of Chemistry;

East China University of Science and Technology;

Shanghai 200237;

China;

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原文格式 PDF
正文语种 chi
中图分类高分子化学（高聚物）;
关键词
dynamic density functional theory; symmetric block copolymer; steady shear; parallel-transverse biaxial texture; perpendicular-parallel-transverse triaxial texture;

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Effect of steady shear on multi-axial texture of symmetric diblock copolymers

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