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Cubic Gels and Lamellar Crystals in Concentrated Solutions of an Amphiphilic Diblock Copolymer by I.W. Hamley; J.A. Pople; M. Ameri; D. Attwood; C. Booth is a Materials Science article available to read on EtoBox.

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The phase behaviour of the alcohol ethoxylate diblock copolymer C 17 E 40 (C=methylene, E=oxyethylene and the subscripts denote the number of repeats) in aqueous solutions has been investigated using small-angle X-ray scattering (SAXS ) and rheology. The sol-gel boundary was located from flow experiments. The structure of the optically isotropic hard gel was determined using SAXS to be body-centred cubic over a concentration range from ~15 to ~70 wt% copolymer. At high concentrations (>60 wt% diblock), crystallization of poly(oxyethylene) was found to lead to phase separation into a biphasic structure in which semicrystalline lamellae coexist with a bcc phase. This phase separation is believed to result from the inability of the crystallized poly(oxyethylene) chains to pack in bcc structure, as evidenced by the much larger domain spacing of the lamellar structure.

Who reads Cubic Gels and Lamellar Crystals in Concentrated Solutions of an Amphiphilic Diblock Copolymer?

Author

I.W. Hamley; J.A. Pople; M. Ameri; D. Attwood; C. Booth

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0927-7757)

Published

1998

Language

EN

Field

Materials Science (Physical Sciences)