Study of oriented block copolymers films obtained by roll-casting |
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| Authors: | Marcelo A Villar Daniel R RuedaFernando Ania Edwin L Thomas |
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| Affiliation: | a Department of Materials Science and Engineering, Massachusetts Institute of Technology, Room 13-5094, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
b Instituto de Estructura de la Materia, CSIC, Serrano 119, 28006 Madrid, Spain |
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| Abstract: | Roll-casting orientation of cylinder microphase separated poly(styrene-b-butadiene-b-styrene) triblock copolymers, was analyzed. The mechanical anisotropy of roll-cast films, defined as the ratio of Young's modulus obtained parallel and perpendicular to poly(styrene) cylinders, is similar for samples prepared using a dimensionless minimum gap between rolls higher than approximately 0.02. The orientation of samples was also characterized by measuring the full width at the half intensity maximum of small angle X-ray scattering intensity circle profiles and showed good correlation with modulus measurements. Blends of triblock and diblock with up to 60 wtpercnt] of diblock show orientation as good as the neat triblock sample. |
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| Keywords: | Roll-casting Oriented block copolymers Small angle X-ray scattering |
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