Inverted phases induced by chain architecture in ABAC tetrablock terpolymers

Michael J. Bluemle; Jingwen Zhang; Timothy P. Lodge; Frank S. Bates

doi:10.1021/ma100510p

Inverted phases induced by chain architecture in ABAC tetrablock terpolymers

Michael J. Bluemle, Jingwen Zhang, Timothy P. Lodge, Frank S. Bates

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Abstract

The bulk morphological behavior of a sequence of poly(styrene-b-isoprene-b- styrene-b-ethylene oxide) (SISO) terpolymers with f_S ≅ f _I and f_O between 0 and 30%, was reported. Nine SISO tetrablocks were generated by the reinitiation and polymerization of ethylene oxide froma single batch of hydroxylterminated SIS copolymer. Molecular weights and polydispersities were determined by size exclusion chromatography. The block volume fractions were obtained by ¹H NMR and are referenced to published homopolymer densities at 140°C. 0.5 wt % of BHT antioxidant was added to the block polymers prior to structural characterization. Morphological assignments were made by utilizing a combination of small-angle X-ray scattering (SAXS), dynamic mechanical spectroscopy (DMS), and transmission electron microscopy (TEM). The SAXS patterns produced by SISO tetrablocks are strikingly different than the other samples, each containing at least three well-defined scattering peaks.

Original language	English (US)
Pages (from-to)	4449-4452
Number of pages	4
Journal	Macromolecules
Volume	43
Issue number	10
DOIs	https://doi.org/10.1021/ma100510p
State	Published - May 25 2010

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abstract = "The bulk morphological behavior of a sequence of poly(styrene-b-isoprene-b- styrene-b-ethylene oxide) (SISO) terpolymers with fS ≅ f I and fO between 0 and 30%, was reported. Nine SISO tetrablocks were generated by the reinitiation and polymerization of ethylene oxide froma single batch of hydroxylterminated SIS copolymer. Molecular weights and polydispersities were determined by size exclusion chromatography. The block volume fractions were obtained by 1H NMR and are referenced to published homopolymer densities at 140°C. 0.5 wt % of BHT antioxidant was added to the block polymers prior to structural characterization. Morphological assignments were made by utilizing a combination of small-angle X-ray scattering (SAXS), dynamic mechanical spectroscopy (DMS), and transmission electron microscopy (TEM). The SAXS patterns produced by SISO tetrablocks are strikingly different than the other samples, each containing at least three well-defined scattering peaks.",

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AU - Bluemle, Michael J.

AU - Zhang, Jingwen

AU - Lodge, Timothy P.

AU - Bates, Frank S.

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Inverted phases induced by chain architecture in ABAC tetrablock terpolymers

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