Fluorescence excitation spectroscopy of polystyrene near the critical concentration <i>c</i>*

Healy, M.Sean; Hanson, James E.

doi:10.1002/app.24796

Cited by 10 publications

(9 citation statements)

References 22 publications

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“…It exhibits a weak peak at 270 nm besides the strong absorption band of mono-benzene. This absorption peak at 270 nm is not consistent with the observed absorption band at 291 nm that was assigned as polystyrene excimer absorption by Healy et al [35] in their study of polystyrene near the critical concentration c*. Li et al [36] claimed the observed absorption at around 290 nm in polystyrene (PSt) as a new UV absorption band that is attributed to associative interaction between pendant phenyl groups.…”

Section: Resultsmentioning

confidence: 75%

“…The fluorescence weak band observed at 285 nm for the polystyrene solution in Fig. 5 is the emission from polystyrene monomer [35]. The missing of 285 nm emission in the studied polystyrene particles and film must result from the nonradiative energy transfer.…”

Section: Resultsmentioning

confidence: 79%

“…3, it is found that absorption peak at 291 nm (3) did appear, along with more absorption peaks, namely 282 (2) and 302 nm (4). Healy et al [35] did also observe a relatively sharp peak at 302 nm and they attributed it to Raman scattering without reasoning. For dried polystyrene particles, the fluorescence at excitation wavelengths of the observed absorption bands (270, 282, 291, and 301nm) all has similar emission profile to the fluorescence at excitation wavelength of 260 nm shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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2011

CheM

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With solvent evaporation, polystyrene fine particles are found to exhibit an unusual fluorescence change from possessing a typical excimer emission band centered at 330 nm to a variety of strong structured bands at longer wavelength with maxima at 356 nm, 365 nm, 372 nm, 383 nm, 404 nm and 426 nm. Similar fluorescence emissions are also observed in polystyrene film after solvent removal. The excitation spectra observed by monitoring these fluorescence emissions at the wavelengths of maxima reveal fluorescence is emitted from different fluorophores. The folding of polystyrene chains during the preparation of polystyrene fine particles through reprecipitation and polystyrene chain relaxation during solvent evaporation are believed to be prerequisites for the formation of different fluorophores via phenyl aggregations, while the aromaticaromatic interactions between the pendant phenyl groups on polystyrene chains are considered to bring a powerful driving force for the formation of fluorophorous phenyl aggregations responsible for the observed fluorescence phenomena. This discovery can contribute to understanding and control of molecular interactions in aromatic systems, especially aromatic macromolecule systems. The luminescence can be used to manufacture light devices and other hybrid materials, as well as to probe local environment in aromatic systems.

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Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

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Untitled

2011

CheM

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“…The peak absorption of PS is at 266nm (4.67eV) [39] with emissions at 285nm (4.36eV) for the PS monomer, and 332 nm (3.74eV) for the PS excimer [40]. Therefore the PS could absorb two-photons at 532 nm and emit at 285nm or 332nm.…”

Section: Polystryene Absorption and Emission Spectramentioning

confidence: 97%

Engineered nanostructures exhibiting enhanced optical nonlinearity

Potasek

2009

SPIE Proceedings

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Because of their unique chemical and physical properties, nanometer-sized semiconductor materials have attracted broad attention in the fields of physics, chemistry, and biology. These capabilities are mainly due to the unusual dependence of the electronic and optical properties on quantum confinement, which for semiconductor materials restricts the particle size in the 1 to 10 nm range. We have fabricated and measured novel nanostructures of semiconductor quantum dots capped with surfactants and embedded in organic thin films that exhibit several orders of magnitude increase in their multiphoton cross-sections of absorption relative to semiconductor quantum dots capped with surfactants in solution or in other matrix materials. Large values of optical nonlinearity have been measured for CdS and CdSe quantum dots in these engineered nanostructures. We will discuss these findings within the context of theoretically proposed hybrid excitons in organic-inorganic nanostructures.

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“…Two excitation peaks also form at 439 and 415 nm on P(St-co-AMMA), the fluorescence peak of the anthracene ring shifts is due to the copolymerization with St. Therefore, the fluorescence peak at 439 nm is caused by the benzene ring in the macromolecular tracer P(St-co-AMMA), and the peak at 415 nm is the fluorescent peak of the anthracene in the macromolecular chain [31]. In the three groups of the fluorescence curves of P(St-co-AMMA), the fluorescence intensity of the macromolecular tracer increases from P (St-co-AMMA)-1 to P(St-co-AMMA)-3 mainly because the reaction amount of AMMA gradually increases from P(Stco-AMMA)-1 to P(St-co-AMMA)-3, whereas the reaction amount of St is always consistent.…”

Section: Fluorescence Propertiesmentioning

confidence: 99%

Preparation and application of macromolecules with a fluorescence effect in polymer processing

Chen

Guo

Chen

et al. 2019

Designed Monomers and Polymers

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In this study, 9-anthracenemethyl methacrylate (AMMA) and styrene (St) as monomers and benzoyl peroxide as an initiator were used to synthesize P(St-co-AMMA), a macromolecule tracer with a fluorescence effect, via free radical copolymerization. A fluorescent online detection device was built on the basis of the principle of fluorescence online detection by using the single-screw extrusion platform of a torque rheometer to explore the effect of the amount of macromolecular tracer and screw speed on the residence time distribution of polystyrene in single-screw extrusion. Fourier transform infrared spectroscopy, 1H-NMR, thermal stability, fluorescence properties, and rheological properties show that the resulting product P(St-co-AMMA) has a degree of thermal stability, fluorescence, and rheological properties similar to polystyrene, so this product can be used to characterize the residence time distribution during single-screw extrusion. The amount of macromolecular tracer P(St-co-AMMA) does not affect the residence time distribution of polystyrene during single-screw extrusion processing, meanwhile, the minimum residence time decreases and the residence time distribution becomes narrow as the screw speed increases, that is, the axial mixing capacity of the single-screw extruder decreases as the screw speed increases.

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Fluorescence excitation spectroscopy of polystyrene near the critical concentration c*

Cited by 10 publications

References 22 publications

Untitled

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Engineered nanostructures exhibiting enhanced optical nonlinearity

Preparation and application of macromolecules with a fluorescence effect in polymer processing

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