Helix to coil transition in poly(γ-benzyl-L-glutamate)

Groot, K. de; Feyen, Jan; Visser, A.C. de; Ridder, G. van de; Bantjes, A.

doi:10.1007/bf01520839

Cited by 5 publications

(2 citation statements)

References 15 publications

(5 reference statements)

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“…From a structural point of view these systems are remarkable since poly(γ-benzyl- l -glutamate) can exhibit both α-helical secondary structure, which confers rodlike behavior or coil configuration. The rod−coil transition can be triggered by (i) varying the temperature at a constant solvent composition or (ii) by varying the solvent composition at constant temperature . The commonly used unwinding agents are dichloroacetic acid (DCA) , and trifluoroacetic acid (TFA). , Roots et al have shown that in a solution of DCA/dichloroethane (80/20 w/w) the PBLG coil form is most stable below 20 °C and the helix form is dominant above 40 °C; the transition temperature is found to be 31 °C .…”

Section: Introductionmentioning

confidence: 99%

“…The rod−coil transition can be triggered by (i) varying the temperature at a constant solvent composition or (ii) by varying the solvent composition at constant temperature . The commonly used unwinding agents are dichloroacetic acid (DCA) , and trifluoroacetic acid (TFA). , Roots et al have shown that in a solution of DCA/dichloroethane (80/20 w/w) the PBLG coil form is most stable below 20 °C and the helix form is dominant above 40 °C; the transition temperature is found to be 31 °C . The morphology of block copolymers containing PBLG blocks, with different molecular architecture, has also been investigated in solution and in bulk. , These studies discuss the structural modification occurring during the self-assembly of the block copolymer after the rod-to-coil transition of the PBLG block.…”

Section: Introductionmentioning

confidence: 99%

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Self-Assembly of Polypeptide/π-Conjugated Polymer/Polypeptide Triblock Copolymers in Rod−Rod−Rod and Coil−Rod−Coil Conformations

et al. 2008

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Self-assembly in the bulk of a series of hybrid triblock copolymers formed by a poly(9,9-dihexylfluorene-2,7-diyl) (PHF) middle block and two poly(γ-benzyl-L-glutamate) (PBLG) end blocks has been studied. Since the R-helical secondary structure of the PBLG block may be either maintained or suppressed depending on the solvent casting history, the PBLG-PHF-PBLG copolymers exhibit two different conformations: a rod-rod-rod or coil-rod-coil configuration, respectively. In order to provide insight into the influence of conformation on self-aggregation of these systems, three copolymers with different block ratio were investigated in both conformations using small-and wide-angle scattering techniques and transmission electron microscopy. Time-resolved photoluminescence measurements were performed on the same samples to explore the effect of morphology on photophysical properties. The observed photoluminescence spectra and dominant excited lifetimes of the poly(9,9-dihexylfluorene-2,7-diyl) block were found to differ markedly in rod-rod-rod and coil-rodcoil configurations and were correlated to the morphology of the self-assembled triblock copolymers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-Assembly of Polypeptide/π-Conjugated Polymer/Polypeptide Triblock Copolymers in Rod−Rod−Rod and Coil−Rod−Coil Conformations

et al. 2008

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Sedimentation Coefficients, Diffusion Coefficients, Partial Specific Volumes, Frictional Ratios, and Second Virial Coefficients of Polymers in Solution

Lechner

Nordmeier

Steinmeier

1999

The Wiley Database of Polymer Properties

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Synthesis and viscosity behavior of poly(γ‐p‐biphenylmethyl‐L‐glutamate) in benzene/dichloroacetic acid mixtures, a comparison with poly(γ‐benzyl‐L‐glutamate)

et al. 1974

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SUMMARY:The synthesis of poly(y-p-biphenylmethyl-L-glutamate), PBPLG, (poly{ L-imino-1 -[2-(4-biphenylylmethoxycarbonyl)ethyl]-2-oxoethylene}), (Id) is described. The viscosity behavior of this polymer in benzene/dichloroacetic acid mixtures (~= 0 , 2 . 1 0 -~-1,4. g/cm3) at 25°C is investigated. The results are compared with measurements on poly(ybenzyl-L-glutamate), PBLG, (poly [ L-imino-1 -(2-benzyloxycarbonylethyl)-2-oxoethylene]), (lc) under the same conditions. A transition from a rigid hydrogen bonded helix to a random solvated coil occurs in two stages for both: PBPLG (first stage 0-55%, second stage 55-100% dichloroacetic acid) and PBLG (first stage 0-

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Helix to coil transition in poly(γ-benzyl-L-glutamate)

Cited by 5 publications

References 15 publications

Self-Assembly of Polypeptide/π-Conjugated Polymer/Polypeptide Triblock Copolymers in Rod−Rod−Rod and Coil−Rod−Coil Conformations

Self-Assembly of Polypeptide/π-Conjugated Polymer/Polypeptide Triblock Copolymers in Rod−Rod−Rod and Coil−Rod−Coil Conformations

Sedimentation Coefficients, Diffusion Coefficients, Partial Specific Volumes, Frictional Ratios, and Second Virial Coefficients of Polymers in Solution

Synthesis and viscosity behavior of poly(γ‐p‐biphenylmethyl‐L‐glutamate) in benzene/dichloroacetic acid mixtures, a comparison with poly(γ‐benzyl‐L‐glutamate)

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