Small-angle neutron scattering from diblock copolymer poly(styrene-d8)-b-poly(γ-benzyl L-glutamate) solutions:: Rod-coil to coil-coil transition

被引：42

作者：

Crespo, JS

Lecommandoux, S

Borsali, R

Klok, HA

Soldi, V

机构：

[1] Ecole Natl Super Chim & Phys Bordeaux, LCPO, F-33607 Pessac, France

[2] Univ Fed Santa Catarina, Grp Estudo Mat Polimer, BR-88040900 Florianopolis, SC, Brazil

[3] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

来源：

MACROMOLECULES | 2003年 / 36卷 / 04期

关键词：

D O I：

10.1021/ma021176j

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The elastic properties of rod-coil diblock copolymer poly(styrene-d(8))-b-poly(gamma-benzyl L-glutamate) (PSd-b-PBLG) rod-coil diblock copolymer solutions were investigated using small-angle neutron scattering (SANS). PBLG is known to undergo a transition from a rodlike a-helical. secondary structure to a random coil conformation under specific solvent conditions: the PBLG is (i) rodlike in dioxane and GO random coil in dioxane/trifluoroacetic acid (80/20). For the PSd-b-PBLG diblock copolymer, this conformational transition results in a topological change from a rod-coil to a coil-coil type structure. SANS results indeed show the presence of the expected scattering peaks-copolymer signature-for both conformational topologies. The position and the height of these scattering peaks are found in good agreement with a recent theoretical model that describes the conformational change in rod-coil diblock copolymer solutions. Circular dichroism experiments confirmed the change in secondary structure in the peptide block that accompanies the topological transition observed by SANS.

引用

页码：1253 / 1256

页数：4

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