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Issue 4, 2005
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Nanostructure formation in poly(γ-benzyl-L-glutamate)–poly(ethylene glycol)–poly(γ-benzyl-L-glutamate) triblock copolymers in the solid state

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Abstract

The morphology in the solid state of a series of triblock copolymers comprising a poly(ethylene glycol) (PEG) midblock and symmetric poly(γ-benzyl-L-glutamate) (PBLG) end blocks has been studied using X-ray scattering and microscopy techniques. Transmission electron microscopy (TEM) on samples selectively stained with uranyl acetate provided clear assignment of morphologies for as-cast and annealed samples. The thickness of both PEG and PBLG domains was in good agreement with calculations based on the conformations of the respective chains, allowing for the crystal or amorphous state of PEG and the α-helical or β-sheet structure of the PBLG. Atomic force microscopy provided complementary information on surface morphology for several samples that was in good agreement with the structure observed by TEM. A morphology diagram was constructed. Cylindrical structures were observed for ordered samples with low fPBLG, whereas at higher fPLBG there was evidence for broken lamellar and “hockey puck” nanostructures. Regular lamellae were observed for intermediate compositions.

Graphical abstract: Nanostructure formation in poly(γ-benzyl-l-glutamate)–poly(ethylene glycol)–poly(γ-benzyl-l-glutamate) triblock copolymers in the solid state

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Publication details

The article was received on 20 Jun 2005, accepted on 07 Jul 2005 and first published on 09 Aug 2005


Article type: Paper
DOI: 10.1039/B508772B
Soft Matter, 2005,1, 284-291

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    Nanostructure formation in poly(γ-benzyl-L-glutamate)–poly(ethylene glycol)–poly(γ-benzyl-L-glutamate) triblock copolymers in the solid state

    P. Parras, V. Castelletto, I. W. Hamley and H.-A. Klok, Soft Matter, 2005, 1, 284
    DOI: 10.1039/B508772B

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