Orientation analysis of uniaxially drawn polycarbonate films, doped with fluorescent molecules, by UV-dichroism, fluorescence polarization and birefringence

Springer, H.; Neuert, R.; Müller, F. D.; Hinrichsen, G.

doi:10.1007/bf01422576

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…With increasing elongation of the film, the dye molecules orient more parallel to the elongation direction. This is interpreted as a steric interaction between the dye molecules and the polymer matrix, which causes the alignment of the rod-like dye molecules preferentially parallel to the stretched polymer chains. ,,− The distribution of orientation angles φ is shown in Figure c,d. The average orientation is initially ⟨φ⟩ = 46.3° and changes during the elongation to ⟨φ⟩ = 24.8°.…”

Section: Resultsmentioning

confidence: 99%

Monitoring Nanoscale Deformations in a Drawn Polymer Melt with Single-Molecule Fluorescence Polarization Microscopy

et al. 2016

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Elongating a polymer melt causes polymer segments to align and polymer coils to deform along the drawing direction. Despite the importance of this molecular response for understanding the viscoelastic properties and relaxation behavior of polymeric materials, studies on the single-molecule level are rare and were not performed in real time. Here we use single-molecule fluorescence polarization microscopy for monitoring the position and orientation of single fluorescent perylene diimide molecules embedded in a free-standing thin film of a polymethyl acrylate (PMA) melt with a time resolution of 500 ms during the film drawing and the subsequent stress relaxation period. The orientation distribution of the perylene diimide molecules is quantitatively described with a model of rod-like objects embedded in a uniaxially elongated matrix. The orientation of the fluorescent probe molecules is directly coupled to the local deformation of the PMA melt, which we derive from the distances between individual dye molecules. In turn, the fluorescence polarization monitors the shape deformation of the polymer coils on a length scale of 5 nm. During stress relaxation, the coil shape relaxes four times more slowly than the mechanical stress. This shows that stress relaxation involves processes on length scales smaller than a polymer coil. Our work demonstrates how optical spectroscopy and microscopy can be used to study the coupling of individual fluorescent probe molecules to their embedding polymeric matrix and to an external mechanical stimulus on the single-molecule level.

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Section: Resultsmentioning

confidence: 99%

Monitoring Nanoscale Deformations in a Drawn Polymer Melt with Single-Molecule Fluorescence Polarization Microscopy

et al. 2016

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“…From An-neglecting form birefringence and making assumptions as detailed in [3]-the second moment of segmental orientation distribution (cos20s)DB or Hermans's orientation factor Ix ((COS20s)DB) can be obtained, if the intrinsic birefringence Ano is known:…”

Section: Birefringencementioning

confidence: 99%

“…Previous papers of the authors [1][2][3] have dealt with the orientation of fluorescent molecules embedded in uniaxially drawn polyvinylchloride and polycarbonate films. The present work renders an investigation into the orientation of fluorescent molecules of the same class within polystyrene films.…”

Section: Introductionmentioning

confidence: 99%

Orientation analysis of uniaxially drawn polystyrene films doped with fluorescent molecules by fluorescence polarization, UV-and IR-dichroism and birefringence

Neuert

Springer

Hinrichsen

1985

Colloid & Polymer Sci

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Atactic polystyrene (PS) is doped in solution with various fluorescent molecules and cast to fdms. Rectangular samples, cut from these films, are uniaxially drawn at 100 ~ and 110 ~ The orientation of the'fluorescent probes is characterized by UVdichroism and fluorescence polarization, that of the polymer segments by IR-dichroism and birefringence. It is observed that the fluorescent molecules depending on their structure tend to orientate more or less perpendicular to the drawing direction. This can be understood by assuming that the benzene rings of the fluorescent probes try to associate to those of the polymer. As consistent values of the angle between the 2850 cm -~ transition moment and the chain axis and of the intrinsic birefringence result 70 ~ and -0.10 respectively.

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Orientation relaxation of fluorescent molecules in uniaxially drawn PVC-films during annealing

Neuert

Springer

Hinrichsen

Frontiers in Polymer Science

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Orientation analysis of uniaxially drawn polycarbonate films, doped with fluorescent molecules, by UV-dichroism, fluorescence polarization and birefringence

Cited by 5 publications

References 7 publications

Monitoring Nanoscale Deformations in a Drawn Polymer Melt with Single-Molecule Fluorescence Polarization Microscopy

Monitoring Nanoscale Deformations in a Drawn Polymer Melt with Single-Molecule Fluorescence Polarization Microscopy

Orientation analysis of uniaxially drawn polystyrene films doped with fluorescent molecules by fluorescence polarization, UV-and IR-dichroism and birefringence

Orientation relaxation of fluorescent molecules in uniaxially drawn PVC-films during annealing

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