The Order–Disorder Transition in Graft Block Copolymers

The order–disorder transitions of diblock copolymers grafted to a common backbone were examined by oscillatory shear rheology and small-angle X-ray scattering. The effect of grafting density, graft molecular weight, number of grafts, and backbone dispersity were studied using poly­[(styrene-alt-N-hy...

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Veröffentlicht in:Macromolecules 2018-01, Vol.51 (1), p.232-241
Hauptverfasser: Maher, Michael J, Jones, Seamus D, Zografos, Aristotelis, Xu, Jun, Schibur, Haley J, Bates, Frank S
Format: Artikel
Sprache:eng
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Zusammenfassung:The order–disorder transitions of diblock copolymers grafted to a common backbone were examined by oscillatory shear rheology and small-angle X-ray scattering. The effect of grafting density, graft molecular weight, number of grafts, and backbone dispersity were studied using poly­[(styrene-alt-N-hydroxy­ethylmaleimide)-random-(styrene-alt-N-ethylmaleimide)]-graft-poly­(4-methyl­caprolactone-block-d,l-lactide) [PSHE-g-(P4MCL-PLA)] as a model graft block copolymer. At high grafting densities (25–50%), the order–disorder temperature (T ODT) of the graft polymers was nearly identical to the analogous linear diblock. At lower grafting densities (
ISSN:0024-9297
1520-5835
DOI:10.1021/acs.macromol.7b02262